!§ nudibranchiate gasteropoda. 



The salivary glands were white, 3 mm long by a breadth of o75 mm , reaching to the foremost 

 part of the stomach; the excretory duct was more than a third of the length of the gland. 



The aesophagus (fig 6 a, 13 a) was rather short. The stomach (fig. 13 b) formed a longish 

 bag (4 mm long), the numerous longitudinal folds of which were distinctly to be seen from without. It 

 contained an abundance of whitish food of indeterminable animal nature with a few imbedded larger 

 calcareous bodies resembling those in the Alcyonia. From the hinder end of the stomach the inte- 

 stine arose to the right, crossed the fore end of the liver, bent backwards, and ran a little sinuous 

 to the anal papilla (fig. 13 cc). Its inner side showed fine longitudinal folds, its cavity was empty. 



The liver, the outside and inside of which was yellow, was a little hollowed to the left of 

 the hinder end of the stomach, its hinder end that was a little narrower, was rounded; it was 5 mm 

 long by a breadth of 3 mm ; it opened by a round opening into the stomach. The yellowish biliary 

 bladder (fig. 13d), of a length of 2 ,T "", was on the left side of the stomach. 



The heart was situated behind the basal part of the intestine. The blood gland was large, 

 lying behind the central nervous system, partly covering the stomach, yellowish, 3 mm long by a breadth 

 of 4 mm and a thickness of o - 5 mm . 



The pericardio-renal organ (the renal syrinx) was situated under the rectum, a little more 

 inwardly than the renal papilla, was melon-shaped, and showed the usual groups of longitudinal folds. 



The hermaphrodite gland was whitish, and covered with its rather large lobes the upper- 

 most and right side of the liver, especially in front; its large follicles contained large egg-cells and 

 bundles of zoosperms. The anterior genital mass was large, 4'5 mm long by a height of 3"5 mm , and a 

 thickness of 2'5"' m , it was situated under and to the right of the intestine. The last part of the sper- 

 matic duct (fig. 14b) was thick, and passed into the short, cylindrical (glans) penis (fig. 14c); this 

 latter, as well as the spermatic duct, was without armature. The spermatheca appeared to be globu- 

 lar, its relation to the spermatocyst (fig. 15), which was filled with sperm, somewhat bent together, 

 and about 1-5""" long, was not to be determined. The mucous gland was lime-white, at the base of 

 its duct was seen a larger, yellowhish gray part (the albuminous gland?). 



D. Ingolfiana var.? 

 PI. V, figs. 29 — 30. 



The bulbus pharyngeus, of a length of 2.25™"', was completely like that in the other 

 specimen, only the end of the radula-sheath projected a little, and the muscular plate on the fore side 

 of the mandibles was a little thicker. The mandibles were a little lighter, and the masticatory edge 

 was only dark yellow; the secondary oral cavities were not small, and their opening rather wide; 

 tin- masticatory edge as above. On the broad and flat tongue the sligthly yellowish radula was seen 

 containing n rows of teeth, in the radula-sheath 20 were found, of which the three hindmost were 

 not fully formed; thus the total number of tooth-plates was 31. On each side of the median tooth up 

 to 18 lateral tooth-plates were found. The median teeth were yellow, the lateral teeth almost colour- 

 less; the height of the median teeth rose to o-c>75"" n . The median teeth were essentially of the same 



