. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 148 H. D. SENIOR. blend. In this particular Tarpon, the ventricle thus measured is 41 mm. long, and taking 9 mm. as the average length of the conus, the proportion of the conus length to ventricle length, becomes I to Six Amia hearts measured in the same way yield an average proportion of conus to ventricle of I to The exterior of the conus presents relations which differ in different re- gions. At the mid-lateral line, and ventral to this, the ventricle covers the conus completely. Dorsal to the mid-lateral line,
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 148 H. D. SENIOR. blend. In this particular Tarpon, the ventricle thus measured is 41 mm. long, and taking 9 mm. as the average length of the conus, the proportion of the conus length to ventricle length, becomes I to Six Amia hearts measured in the same way yield an average proportion of conus to ventricle of I to The exterior of the conus presents relations which differ in different re- gions. At the mid-lateral line, and ventral to this, the ventricle covers the conus completely. Dorsal to the mid-lateral line, the ventricle recedes rapidly, so as only to overlap the conus for a short distance on either side ; in the interval, the conus is incom- pletely covered by the atrium. The area uncovered by ventricle and at- rium measured back from the bulbus, is about 3 mm. in the midline, and lateral to this about 4 mm., it is cov- ered by visceral pericardium. (These relations are indicated in Fig. 2.) The conus is everywhere overlaid by a distinct layer of loose connec- tive tissue, which separates it from the structures which cover it, and renders its outline very distinct in sections of the heart. Owing to the looseness of its connection with neighboring structures, the entire conus is easily exposed from the outside by incising the pericardium at the base of the bulbus, and strip- ping it away from the adjacent parts of the ventricle and atrium. The conus valves are disposed in two transverse rows. Each row consists of a right and left cusp symmetrically placed with regard to the median dorso-ventral plane of the conus. Seen rom the lumen of the heart (as in Fig. i) the valve cusps of. FIG. 2. Diagrammatic right lateral surface-view of bulbus, conus and ventricle. The atrium is represented as incised mesi- ally, and the right half removed (natural size). The line across the conus indicates the site of re- flection of visceral pericardium on to the atrium. The broken line indicates the
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
