296 ME. GUT C. EOBSON ON MOLLUSCA 



relatively short, consisting of but two simple coils round the peculiarly trilobed liver 



(PI. XXXII. fig. 4:b). 



Meart, kidney, etc. — The auricle exhibits a rather peculiar shape, being slightly 

 folded on itself around its junction with the ventricle, which is effected by means of a 

 narrow rather elongate neck. The ventricle is somewhat triangular in section. The 

 kidney was not dissected fully enough to warrant particular description (PI. XXXII. 

 %• 6). 



JServous system. — The general disposition only was made out (text-fig. 8). It may 

 be remarked, however, that the nerves innervating the viscera proceeded from the same 

 ganglionic mass as those innervating the right side of the mantle, careful dissection 

 failing to reveal any discontinuity in the tissues between the pallial and visceral roots. 

 It would therefore appear that the visceral and right pallial ganglia are completely 

 fused. This condition was observed in two specimens, but must await further proof. 



Genitalia (text-fig. 9). — On first opening the body-cavity one is struck by the 

 extensive albumen gland, which extends its lobes with their finger-like processes around 

 and among the other organs, which can only be separated out from the solid mass of the 

 gland by cutting the latter away. The author has been struck by the possibility of this 

 extensive development of the gland being merely a temporary physiological phase. 

 Col. Godwin-xlusten, F.R.S., informs him that he has observed considerable seasonal 

 variation in the albumen gland of Zonitoids. But in any case the gland must be very 

 extensive and diffuse. 



The penis is straight, and at the point where the fibres of the retractor are given off 

 it is peculiarly folded. 



There is a stout and long epi])Jiallus, terminating in a small reniform flagellum. 

 The vas deferens is very long, and follows closely the course of the vagina. 



The s])ermailieca is long and club-shaped. When containing the spermatophore 

 it is rudely quadrate at its extremity. The diffuse albumen gland has been already 

 commented upon. The junction of the latter with the oviduct was unfortunately 

 not found, while the ovo-testis was only obtained in a fragmentary condition. 



H ELICID^. 



7. Papuina lituus (Lesson). (PI. XXXII. figs. 1,2; PI. XXXIII. fig. 8 a-c.) 

 Helix lituus Lesson, Voy. de la ' Coquille/ Zool. p. 309. 



Two complete examples from Launch Camp. 



These two examples have been referred to Lesson's species after examination of 

 many other specimens and reference to all the available literature. The author has 

 come to the conclusion that the conchological boundary between this species and 

 P. taumantias T. Canefri is as yet ill-defined, and it is easy to confuse the two. In 

 fact, until the radula and genitalia of this form were examined, the author actually 

 set it down as P. taumantias. The conchological characters that differentiate this 



