104 PROCEEDINGS OF THE ACADEMY OP [1819. 



the anal opening (PI. III. fig. 65a). The contents of the intes- 

 tine, stomach, and oesophagus were indistinct animal matter. 



The liver of a clay-yellowish color, large ; the length about 4.7 

 mm., with a breadth of 30, and a height of about 26.0 mm.; the 

 hinder end rounded ; the foremost half of the lower lobe wanting, 

 its place occupied by the stomach; the front, therefore, very 

 oblique, sloping backwards and somewhat towards the right side 

 (Avith an impression for the large anterior genital mass). On 

 the surface of the liver rather superficial furrows in different 

 directions, especially transverse; through the middle part of the 

 upper side of the liver, beginning at the right side, a somewhat 

 deeper longitudinal furrow diverges towards the left side, con- 

 taining the renal chamber; at the junction of the first and the 

 second third of the upper side a very deep transverse groove for 

 the pyloric part of the intestine (which turns to the left) ; but the 

 part of the liver before the groove is a continuation of the whole 

 liver, and not only of the left part of it (as in the Tr. Hombergi). 

 The structure of the liver is as in the typical form. 



The atrium and ventricle of the heart are as usual, the ventricle 

 9.0 mm. long, and the renal syrinx about 3.0 mm. long, of the 

 usual structure; the renal chamber, as far as it could be deter- 

 mined, as in the Tr. Hombergi} 



The gland, hermaphrodisiaca not distinguishable in color from 

 the liver, covering the surface of that organ nearly as in the Tr. 

 Hombergi, and of similar structure. The follicles contained zo- 

 osperms and lai'ge oogene cells. 



The anterior genital mass very large, 30.0 mm. long, 18.0 mm. 

 in greatest breadth, and 23.0 mm. in greatest height. The ductus 

 hermaphrodisiacus issues from the upper part of the front of the 

 liver about in the middle line under the first reflection of the in- 

 testine. It is yellowish, not long, and about 1.0 mm. in diameter. 



It swells rather abruptly into the ampulla, which is very long 

 and strong, and forms a bunch of thick coils on the back of the 

 anterior genital mass. When straightened the ampulla was about 

 120.0 mm. long; diameter variable, but reaching 6.0 mm. It was 

 crammed with zoosperms. The spermato-duct (vas deferens) was 

 strong, not long ; furnished before entering the penis (in the speci- 

 men examined), with an ampulliform dilatation; then penetrating 



', Cf. A. Hancock on the structure and homologies of the renal organ in 

 the Nudibr. Moll. Trans. Linn. Soc, xxiv. p. 515, PL LIV. fig. 5-8, 1864. 



