. Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. 7« Practical Zoology. m. 11. Back of the oviduct or hinder part of the sperinaries is a small, pink (sometimes pale green) sac, the urmary bladder. Luok for its external opening back of the anus. 12. Gently separate the parts of the digestive tube, and remove- any fat that is in the way. Make a diagrammatic sketch of the digestive orgms as seen from the ventral aspect, showing and labeling the stomach, intestine, ceca, and the anal opening. 13. Turn now to the pericardial cavity and examine the heart. The red, angular portio
. Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. 7« Practical Zoology. m. 11. Back of the oviduct or hinder part of the sperinaries is a small, pink (sometimes pale green) sac, the urmary bladder. Luok for its external opening back of the anus. 12. Gently separate the parts of the digestive tube, and remove- any fat that is in the way. Make a diagrammatic sketch of the digestive orgms as seen from the ventral aspect, showing and labeling the stomach, intestine, ceca, and the anal opening. 13. Turn now to the pericardial cavity and examine the heart. The red, angular portion of the heart, which in the natural posi- tion of the fish lies lowest and hindmost, is the ventricle; the darker, more irregular portion lying (in the natural position) above the ventricle, is the auricle -, the larger blood cavity back of the auricle, and extending across the body cavity, above the false diaphragm, is the venous sinus; in front of the ventricle is the light-colored conical arterial bulb. This narrows forward into an artery which gives off branches on both sides, one to each gill. Make a drawing of the heart and arterial bulb. After passing through the gills, the blood tubes unite to form the dorsal aorta, which passes backward just underneath the spinal column. From above 'the gills branches als'- run forward to the head. Cut away and remove the liver, , intestine, and ovary (or spermaries). 14. In the dorsal pp't of the body cavity is the air bladder. Carefully scrape away seme of the thin peritoneal covering and note the thin, transparent wall of the air bladder itself Scrape away as much as possible of the peritoneum covering the air bladder, in order to see if there are any blood tubes in the walls of the air bladder. Make a puncture in the center of the air bladder. What is the result? Slit the air bladder along most of its length and explore its extent and relations. Except on its ventral surface it is attached to the inside of the walls of t
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1903
