XIT)IBRANCHIATE GASTEROPODA. 



25 



part of the tongue) was almost o-i2" m by a breadth of o-o65 mm and a height of cro6 mm ; the heights of 

 the three innermost lateral plates were 0-12— 0-13 — o-i4 mm , the 10 th measured already a height of cr20 mm , 

 and the height rose to o - 22 mm , whereupon it again decreased outward, the height of the three outer- 

 most being o-o8 mm , o-o6" ,ra , 0-035— o-04 mm . The median tooth-plates (figs. 19, 22 a) showed a base, narrow 

 anteriorly, broader posteriori}', from which rose a tapering hook, denticulated through the greater part 

 of its length. The first lateral tooth (figs. 20, 21, 22 b) was denticulated on the inside of the hook. 

 All the other tooth-plates showed no denticulation on the somewhat bent and tapering hook (figs. 23, 

 24); the outermost one was quite low (fig. 25 a). 



The whole visceral mass, 23 mm long, up to 13™™ broad, was at the hinder end short-conical, 

 and showed, when viewed from above, foremost the large, light grayish yellow liver, prolonged along 

 the left side of the mass just to the hinder end; this prolongation has on the right side the herma- 

 phrodite gland, and along part of the right edge the rectum. 



The salivary glands were seen as a large and flat, yellowish mass on either side of the 

 hinder part of the bulbus pharyugeus. 



The oesophagus was short, and opened into the stomach that was completely covered by 

 the liver. This stomach was ri mm long by a breadth of 6 mm , with rather thin walls; to the right it 

 was attached to the anterior genital mass with the exception of the region of the cardia, otherwise it 

 was everywhere enclosed by the firmly adhering liver; its inside showed strong longitudinal folds; on 

 the left side was seen a rather wide biliary opening, and on the right side more downwards a smaller 

 one. To the right from the hinder end of the stomach rises the intestine, which is in its foremost, 

 transverse course completely enclosed by the liver, then proceeds freely, and runs down towards the 

 foot along the right side and the lower side of the hermaphrodite gland, running between this and 

 the liver up towards the anal papilla, closely attached to both of those; the length of the intestine 

 was 22 mm , its diameter at the base 5 mm , else 4 — 3'5 mm ; in the first part of it a long, beautiful, feather- 

 shaped fold was seen. — The stomach and especially the intestine were distended by strongly brown-red, 

 animal contents, whose colour was due to enormous masses of long finely-thorny and -rugged, 

 reddish spicides, perhaps originating from a form of Alcyonidae; further was found in the stomach a 

 canary-coloured, globular body, on one side a little hollowed in an umbilicate manner, of a diameter 

 of 4 mm , the nature of which could not be made out. 



The large, light grayish yellow liver covered with a layer, before somewhat thicker, behind 

 thinner, the oesophagus, the stomach, the anterior genital mass, and part of the intestine; its foremost 

 part was on either side attached to the wall of the body. The liver continues along the left side and 

 the lower side of the hermaphrodite gland just to its point; in this part it rose to the largest thickness, 

 up to 3 - 5 mm . 



The pericardio-r enal organ, of a length of 2 mm , was situated near the anus. 



The yellowish white hermaphrodite gland was large, i6 mm long by a breadth of 6 mm and a 

 thickness of 5 mm ; before and behind a little narrower than in the middle; a little curved longitudinally; 

 somewhat convex on the upper surface, concave on the lower one; with superficial furrows; finely 

 gritty; of the common structure. In the endlobes were large oogene cells and zoosperms. — ■ The 

 anterior genital mass was from above hidden by the liver, situated before the intestine, attached to 



The Ingolf-Expedition. II. 3. 4 



