188 30 



the common kind. In the rhinophores small spicules were seen, as also very sparingly 

 in the skin and in the interstitial connective tissue. 



The buccal tube was short. The bulb us pharyngeus was almost quite as in 

 the mentioned species, of a length of almost I™ ; at the hinder end the radula sheath is 

 somewhat projecting ; at about the middle of the upper side the crop is situated with a 

 rather broad base. The slightly brownish yellow labial ring w r as formed of several series 

 of closely packed, somewhat compressed elements of a height of up to O'OfO™ 11 , and a 

 diameter of up to O'OlMo™ 11 . The buccal cavity was almost quite filled by the large 

 tongue. In the radula and its continuation in the sheath 27 — 28 series of tooth plates 

 were found (in the three specimens), of which the three hindermost ones were not yet 

 fully developed. The relations of the radula were as in the typical species. The tooth 

 plates were almost colourless, especially the outermost ones. The rhacbis was quite narrow. 

 The height of the lateral plates was O'OS 11 ™, that of the marginal ones about 0-04°™. The 

 form of the lateral plates (fig. 16) was about as in the typical species, but the denticulation 

 of the edge of the hook much stronger, the number of denticles was mostly towards 30. 

 The marginal plates (fig. 17) were also chiefly of the same form as in the typical species, 

 the outmost leaf-like, rather low . the nature of the edge was rather våning. — The 

 crop of the bulbus pharyngeus is. as in the mentioned species, almost as large as the 

 bulb itself, mostly globular, of the same appearance and structure as in the mentioned 

 species ; its not wide opening was triangular. 



The whitish salivary glands were as in the typical Idalia, also somewhat con- 

 stricted in the middle. 



The oesophagus (fig. 18 a) was rather long and thin; in its hinder end was 

 found in one specimen a torn out tooth-plate of the tongue: it ran into the stomach 

 at the bottom of the hepatic cleft beside the biliary duct (flg. 18 ci. The stomach (fig. 18 b) 

 was bag-shaped, of a length of about i'o 1 ™, the greater part of its length situated before 

 the liver, with longitudinal folds on the inside, one of which continued almost through the 

 whole length of the intestine iS^o™ 111 ) (fig. 18 di. The digestive cavity contained a small mass 

 of animal substance. 



The grayish yellow liver had a length of 4 , 5 mm ; it was anteriorly curtailed, poste- 

 riorly a little pointed, on the lower side flattened; anteriorly to the right it was a little 

 flattened by the anterior genital mass, on the upper side rather strongly furrowed. 



The hermaphrodite gland was in colour (now) scarcely to be distinguished from 

 the liver; its structure appeared to be the same as in the typical species; in its lobes 

 were found fully developed ovigerous cells, but scarcely developed zoosperms. — The 

 whitish anterior genital mass was about 2"5 mm long, the prostata formed great part 

 of it; the opaque spermatocyst rested on the clear, globular spermatheca below, which 



