PLATK X. 



Pi,;. 3(5. — The ventral portion of the body wall is cut open ami ri'tlccted to show the iierirarilial chamber. Natural 



size, 

 a. br. v., anterior branchial vein; in this case collapsed and not formintr an auricular expansion, 

 a. p. g., anterior pericardial gland. The one to the left lies naturally; the (Hic on the riirht has lieen turned 



upward to show tlu' anterior branchial vein. 

 H, heart, enfolded b.y the pallio-visceral lijianient. The .septal arterv runs over its ventral surface, suspended 



In' a nie.sentery-like fold of the pallio-visceral li.aament, and through the posterior viscero-pericardial 



apei'tui'e. 

 j, junction of the body wall and the pallio-visceral ligament posteriorly. 

 1, ligament from the ventral edge of the posterior renal sac extending along tlie body wall, 

 p. a., jiallial artery. 



p. br. v., posterior branchial vein, partly expanded, 

 p. p. g., posterior pericardial gland. 

 p. v. a. b., posterior vejitral aponeurotic band. 

 p. v. 1., pallio-visceral ligament. The three apertures through it by which the pericardial and geuhal divisimis 



of the co'lom are put in communication are at either side of and behind the heart, 

 p. v-p. ap. , posterior viscero-pericardial ajierture. 

 pyr. s. , ()yrif(M'm sac. 



r.s., anterior wall of the right posterior renal sac. 

 Fig. 37. — Renal ajipendages from the posterior wall of one of the renal .sacs. >. -. 

 Fig. o8. — Male genital organs viewed from above and in fnmt. Ttu' anterior |iortion is represented as dissected fnnn 



the body wall. Natural size, 

 ac. gl., accessory gland surrounding the vas deferens. 



ao, aorta, passing upward from the heart at the liack of the lucmoco'lir in.-mlirane- 

 g.l., genital ligament, 

 gas. 1., gastric ligament. 



1, intestine, cut at the middle of the second loop. 

 II., intestinal Hgament. 

 P. ap., external opening of the penis. 

 P. 1., left tube of the penis. 

 P. r., right tube of the penis. 



p-v. 1., pallio-visceral ligament .at its attachment to the posterior side of the heart, 

 pyr. ap., external aperture of the pyriform sac. 

 pyr. s., pyriform sac. 

 r., rectum. 



Sep., septum dividing the speniiatophore sac. 

 sp. s.,spermatoiihore sac. 

 S. v., seminal vesicle. 

 T. ap., aperture of testis. 



T.g., face of the testis winch is pressed against the stomach. 

 T. I., face of the testis which is pressed against the liver. 

 V. d.', proximal thin-walled portion of the vas deferens. 

 V. d.'^ conimenceinent of the thick-walled portion of the vas deferens, which extends from this iioint to flic 



seminal vesicle. 

 X, tliickening of the tissues of the genital ligament (ixtciiding from the root of tlie siphuncle. 

 y, tunic of the accessory gland carried upon the back of the testis. 

 Fio. 39. — Female .genital organs viewed from in front and above. The anterior portion of the ovary rests upon the 



pallio-visceral ligament. The heart and auricles show through the viscer(i-|)ericardial apertures. Natural 



.size, 

 ao, aorta. 



ex. ap., external aperture of the oviduct. 



g. 1., attachment of the genital ligament to the |iostcrior body wall, 

 .gas. I., ga.stric ligament. 

 I, intestine. 



I.b, inte.stinal ligament. 



1 a., line along which the hsemoco'lic membrane is altacheil ventrally. 

 I. v-p. ap., left anterior viscero-pericardial aperture. 

 (»v., ovary. 



Ov. ap., a[>orture of the ovary slightly pulled away from the imier apcrliuc of the oviduct, 

 ovid., thin-walled portion of the oviduct, 

 ovid. aji., inner aperture of the oviduct. 



ovid. pap., plaited, freely jirojecting tip of the oviduct; tlie ovidncal papilla, 

 p. an., posterior auricle. 



pvr. ap., o|iening of the iiyriform sac intip the .mantle cavitv. 

 pyr. s., |.iyriform .•^ac. 



r 1, ligament attaching the rectum to the jmllio-visceral ligament. 

 r. v-p. ap., right anterior viscero-pericardial aperture, 

 s, nodule in the genital li.gament at the root of the siphuncle. 

 Ki(i. 40. — Cartilage viewed from the anterior side. Natural size. 

 c, ce|ihalic process, 

 i., infundibular ])rocess. 



1. i., point of attachment of the levator of the funnel, 

 m. p., median process of the body of the cartilage. 

 V, v', holes thr. High the cartilage occupied by vein.s. 



216 



