Morphology of Invertebrate Types |
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abdominal alimentary canal ambulacral animal antennæ anus aorta appendages artery attached blood body cavity body wall branches branchial carapace cells cephalic chitinous ciliated circular cloaca composed connected consists cuticle diameters dissecting drawing showing duct ectoderm edge endoderm endoskeleton endostyle epithelial Examine excretory system female fibres five pairs formed funnel ganglia ganglion gastric genital opening gill gland gonads groove half page drawing heart hypodermis inclosed integument interradial intestine joint Label lacunæ lateral layer liver lobes longitudinal muscles male mantle cavity maxillipeds median medusa membrane mesenteries micronucleus microscope mouth nematocysts nephridia nephridial nephridiopores nephridium nerves nervous system neuromeres oesophagus oral ossicles ovary oviduct papillæ pereiopod peristome pharynx plates pleopods polyp pores posterior end pouch prepared slide protopodite radial canals rectum reproductive organs retractor ring segment side sinus siphon situated somite specimen sperm spines statocysts sternite stomach sucker tentacles tergite thoracic transverse tubes uterus valves ventral surface vessel
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Page 16 - Obelia sp. A, portion of a colony with certain parts shown in longitudinal section ; B, medusa ; c, the same with reversed umbrella ; D, the same, oral aspect. Bd. i, 2, buds ; bis. , blastostyle...
Page 196 - F-shaped ossicles, called by that name on account of their two diverging ligaments. These long and thin ligaments arise side by side from the head or distal enlargement of the compass and are attached to the peristomial edge of the two adambulacral plates on each side adjoining the radius to which the ossicle belongs. The muscular apparatus of the lantern is very complicated. It consists of seven sets of muscles aggregating no fewer than sixty individual muscles.
Page 150 - The foregut begins with the mouth which is provided with mouth parts in the shape of an upper lip, a pair of mandibles, a pair of maxillae, and a lower lip with the hypopharynx, all except probably the upper lip being true appendages.
Page 196 - The hollow axis of this lantern is formed by the pharynx while the body of the lantern which has the shape of a pyramid with a pentagonal base is composed of five complicated calcareous parts or jaws and as many groups of muscles. When isolated each calcareous jaw appears in the shape of a triangular pyramid. The middle portion of the tooth is inclosed between the two halves of an ossicle called the alveolus.
Page 6 - F, of the gravity or storage cell, the other two cups are connected one to one end, and the other to the other end of the primary of the small coil A, B.
Page 132 - ... rhythmically, so as to occasion a kind of imperfect circulation, we shall have an idea of the so-called arterial system of the earthworm. The heart of the crayfish is a vessel with several sides suspended by six ligaments in a large sac called the pericardium. The blood enters the heart by six apertures, provided with valves to prevent the return of the blood to the pericardium. The heart contracting expels the blood through six arteries which ramify minutely, and thus convey the blood to every...
Page vi - Accordingly the treatment of the subject of this manual differs somewhat from the usual. Each chapter consists of two parts: a monograph in which a description is given of the animal selected as representative of its class and instructions for the students to follow in dissection.
Page 196 - The middle portion of the tooth is inclosed between the two halves of an ossicle called the alveolus. The elastic free upper end of the tooth is curved over the base of the pyramid and inclosed in a pouch of the oral sinus.
Page 196 - They are attached to the epiphysis and the peristomial edge of the test and run to the inside of and parallel to the compassligaments.
Page 107 - It is the secretion of these glands which prevents the coagulation of the blood. Most of the present paper is anatomical. Some observations of a chemical nature seem to indicate that the substance to which the secretion owes the activity alluded to above is a nucleo-albumin. WDH Calcium in the Liver Cells of the Ox. By P. KRCGER and