. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 310 HORACE W. STUNKARD diameter; the esophagus is mm. in length; the intestinal crura, which are preacetabular, diverge at a wide angle and measure mm. in length. Fixed and stained specimens are somewhat smaller; the smallest gravid worm is mm. long; mm. in greatest width; in diameter the oral sucker is mm., the acetabulum is mm., and the pharynx is mm. The uterus of this worm contains 14 eggs. The excretory system is unchanged from that in the metacercaria. The pore is termina
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 310 HORACE W. STUNKARD diameter; the esophagus is mm. in length; the intestinal crura, which are preacetabular, diverge at a wide angle and measure mm. in length. Fixed and stained specimens are somewhat smaller; the smallest gravid worm is mm. long; mm. in greatest width; in diameter the oral sucker is mm., the acetabulum is mm., and the pharynx is mm. The uterus of this worm contains 14 eggs. The excretory system is unchanged from that in the metacercaria. The pore is terminal; there is a preporal sphincter, a hicornuate bladder, from which the col- lecting ducts pass anteriad as shown in Figure 2. The testes are lateral, opposite, situated at least partially in the acetabular zone and about midway between the anterior and posterior ends of the enlarged portion of the body; they are oval to ovate, mm. in the transverse axis and ed ts. u't vd a'c g'p mp vcl ut FIGURE 3. Composite drawing of two adjacent, slightly oblique, 10 /" sections, to show relations of acetabulum, gonads, genital pore, male papilla, vitelline ducts (one of which is enlarging before joining with the one from the opposite side), and dorsal to it the initial coil of the uterus containing a newly formed egg; ac, acetabulum; ed, ejaculatory duct; gp, genital pore; in, initial coil of uterus; mp, male papilla; ov, ovary; sv, seminal vesicle; ts, testis; ut, uterus; vd, vitelline duct. Parenchyma not shown. mm. in the longitudinal one. Sperm ducts arise from the median faces, pass mediae! and anteriad, join above the acetabulum, and the common duct expands into a large, transverse, oval seminal vesicle which may be as large as one of the testes and is located medially or slightly to the left in the area directly behind the digestive ceca. From the vesicle, an ejaculatory duct curves posteriad, mediad, and ventrad. It terminates in the male papilla which ope
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
