found at Aneiteum, Neiv Hebrides. 39 



A remarkably stout scutcllum with smoothly rounded extre- 

 mities, presenting little of the scale-like character of the same 

 organ in other Slugs, is enclosed between the layers of the 

 mantle. 



The tentacula arise directly from the head, having no con- 

 nexion whatever with the mantle. They gradually diminish in 

 size towards the free extremity, which is slightly dilated and of 

 an oval form, containing the visual organs. 



The roof of the mouth is furnished with a quadrilateral horny 

 tooth, having a cresceutic inferior or cutting edge, and from its 

 intimate connexion with the buccal mass, rather than with the 

 upper lip, it would remind one more of the upper mandible of 

 Cephalopods than of its representative in the veritable members 

 of the genus Liinax. 



The lingual sac and dental plates and tubercles very closely 

 resemble those of Limax, Helix, and Bulimus. Thus, the sac 

 itself is short and moderately wide, with a rounded fundus pro- 

 truding a little from the buccal mass posteriorly. The lingual 

 plates are subquadrilateral in figure, the outer and posterior 

 borders being somewhat concave, and the anterior and internal 

 slightly convex ; and each plate supports a simple conical dental 

 process inclining a little inwards, and having a small angular 

 projection on either side of the base. The plates of the central 

 series are quite rudimentary, each presenting a bifid anterior 

 portion and a small and pointed posterior extremity. The latter 

 characters, if they do not prove to be generic, may at least 

 serve to distinguish the species. 



The generative system is remarkable for the compactness of 

 all its parts. 



The ovarium (PI. III. fig. 6 i) and testis {k) lie in contact with 

 each other at about the middle of the dorsal region. The former, 

 on the left side, gives origin to the small or primary oviduct (/), 

 and the latter, on the right, is wrapped up, as it were, with the 

 tortuous commencement of the larger oviduct or uterus [in], but 

 both testis and ovarium are separated from the liver by the in- 

 terposition of the stomach. 



The vas deferens emerges from the smaller or anterior portion 

 of the testis (o), winds in a dextral manner round the uterus, 

 and having reached the union of the organs of both sexes, it 

 crosses over to the left side and retrogrades upon the under sur- 

 face of the retracted male organ so as to terminate near the in- 

 sertion of the short retractor muscle {p), which arises from a 

 point corresponding to the union of the foot with the dorsal 

 integument on the left side. 



The spermatheca [q) is of considerable size and filled with a 

 purplish-brown secretion ; but its duct, which arises from the 



