NUDIBRANCHIATE GASTEROPODA. 21 



measuring in length (from before backward) 2' 1 "" ; behind this was seen the short radula-sheath with its 

 flat hinder end 1 ); it was 2'5 mm lon »> 3'25" ,m broad, and was to be seen on the outside of the bulbus 

 pharyugeus where it shone through with a reddish tint. The light yellow radula contained 35 series 

 of tooth-plates, the radula-sheath 32, of which the three hindmost were not yet developed, the whole 

 number of plates was thus 67. The length of the radula, when prepared off, was 9 mm , and the breadth 

 up to 7 mm . The foremost n series on the tongue were more or less defect, and the tooth-plates more 

 or less worn and broken; in the 6—7 foremost series only the median tooth and a few lateral teeth 

 were left. The number of tooth-plates in a series rose in the back part of the radula to 85. The 

 tooth-plates were of a very light yellow. The breadth of the oldest median tooth was r28 mm , that of 

 the youngest ones about the same. The height of the innermost lateral tooth was o-i6 mm , that of the 

 next one cr20 mm , and of the third o-24 mm ; the height of the lateral teeth rose to 0'30 mm , decreased to- 

 wards the edge of the radula, and of the three outermost teeth it was 0.12— o-io— cro8 nim . The median 

 teeth (fig. 5 a) were of the broad and short form common in the Tritouiae, with a clumsy median 

 tooth, and a still more clumsy denticle 011 each side of this. The clumsy and rather low first lateral 

 tooth (fig. 20; 5) was very finely denticulated along one edge of the hook; the hook of the second 

 lateral tooth was a little longer (fig. 21; 5), but, as all the others, without any trace of denticulation ; 

 they had all (fig. 22; 6) the form common in the Tritouiae, the hook decreased in height through the 

 outer teeth (fig. 7). 



The whitish salivary glands, parallel to the esophagus, were longish (7— 8 mm long by a 

 breadth of 2 n,ra ), flat, highly lobed; the left one was lying on the black peritoneum, the right one 

 under and behind the bulbus pharyugeus, between this and the anterior genital mass. The efferent 

 duct was almost as long as the gland itself. 



The sesophagus was externally and internally black, i7 mm long, in its greatest length sack- 

 like widened (to a diameter of 5-5 mm ), with deep folds on the inside, empty; it opened into the hind 

 part of the stomach, close to the short biliary duct. The stomach, likewise black on the outside, 

 but gray on the inside, was almost globular, of a diameter of 7 mm , and for half its length situated in 

 a hollow in the liver; in the hindmost part of the stomach before the opening of the biliary duct was 

 seen a circle of strong, yellowish, longitudinal folds; the cavity of the stomach was empty. From the 

 fore end of the stomach arose the intestine, externally black, internally gray, of a whole length of 

 i8 mm by a diameter of 4^ 2 mn ', stretched over the anterior genital mass where it formed its curve, and 

 continued somewhat thinner to the anal papilla; throughout almost the whole length of the intestine 

 was seen, besides the fine longitudinal folds, the strong fold, rising to a height of up to 2 mm , that 

 had already begun in the hind part of the stomach; also the cavity of the intestine was empty. 



The hindmost visceral mass (the liver) was short-conical, broader in the hollowed fore end, 



with rounded hinder end, of a length of I5 mm by an anterior breadth of I2 mn \ yellowish white, with a 



rugged surface, wrapped in a very abundant, black, loose, but rather adhesive connective tissue. From 



the liver itself a longish lobe, io mm long, stretched over the cardia between the sesophagus and the 



stomach, with the beginning of the intestine 2 ). 



') Comp. Malakolog. TJnters. Heft XV. 1884. Taf. LXXII, Fig. 5 (Tritonia Hombergi). 



-) In the black wrapping round the hindmost visceral mass a Gordius-like worm was found of a length of fully 



I0 mm by a diameter of 0-0651 



