434 REPORT ON THE SLUGS. 



to say. Simroth certainly thinks they are, for he writes {I.e., p. 879), "Die Summe 

 dieser Dateu macht es wohl mehr als wahrscheinlich, dass auch bei den Vaginuhden 

 das Reizorgan als Liebespfeil zu deuten sei." 



V. The Integument. 



The body-wall of the dorsum or notiim is somewhat thin; in transverse section 

 it is seen (PI. XLI. Fig. 14) to consist of an outer epidermal layer, immediately 

 beneath which is a dense layer of blackish pigment. This layer also borders the 

 sides of the mucous glands; of these latter I have obtained very good sections by 

 freezing, staining with an aqueous solution of magenta, and mounting in a glycerine 

 fluid. The lumen of the gland is narrow, becoming in must cases slightly larger at 

 the base; around this canal are a series of bladder-like cavities, which probably serve 

 as reservoirs for the mucous. 



Excepting that the notum in V. ivilleyi is thinner than that described by Simroth 

 in V. leydigi, my observations agree practically in all particulars with his. In the 

 mucosa, the concretions which Simroth thinks may be uric acid, were very plentiful 

 and in a few cases very large. 



2. Aneitea hirudoh P- Fisch. (PI. XLI. Figs. 15—17.) 



Hab. Lifu. One specimen. 



After a careful comparison of this small species with all the described forms, 

 I am placing it with a query under A. hirudo, P. Fisch. From the imperfect 

 development of the generative organs I conclude it is a young example. It agrees 

 with Fischer's figure' of A. hirudo in the form of the penis (PL XLI. Fig. 16, p.). 



The whole of the body is a dirty greyish-brown colour, vnth a few blotchy black 

 markings on the lateral portions of the body. There is an ill-defined median-dorsal 

 groove with oblique lateral grooves directed posteriorly and ventrally. The margin of 

 the dorsum (perinotum) is wavy. The foot-sole is marked by a series of closely set 

 transverse markings. In transverse section the body appears almost triangular (PI. XLI. 

 Fig. 17). 



The dimensions are as follows : — 



Length over back, from head to tip of the tail 22'.5 mm. 



Length of foot-sole 19'5 mm. 



Width over back 10 mm. 



Breadth of foot-sole 6'5 mm. 



Distance of anus from right tentacle 6'.5 mm. 



„ „ „ respiratory orifice 1 mm. 



Length of mantle 7 mm. 



1 Journ. de Conchyl., 1868, T. xvi, pi. xi. 



