386 ON THE SUPPOSED NEW ZEALAND SPECIES OP LEPTOPOMA. 



Lagochilus. The chief peculiarity of that genus, expressed by its 

 name, viz., a slit or incision in the upper lip at its insertion, is 

 formed by the margins, or rather the upper margin and the 

 parietal callosity, meeting in an angle and is of course distinctly 

 visible only in those species which liave a thickened lip and 

 connected margins, but there are many recognised species of 

 Lagochilus with a thin lip and remote margins in which the above- 

 mentioned formation is only represented by the angular insertion 

 of the upper margin. Of the New Zealand species Lagochilus 

 cytora, Gray, belongs to the tirst group, having a double lip and 

 continuous peristome and showing a distinct slit or groove at tlie 

 upper angle of the aperture, whilst L. pannosum, Hutt., calvuvi, 

 Hutt., pallidum, Hutt., and the new species, L. torquillum, Suter, 

 are formed in the latter way. 



The question whether my classification is correct or not can only 

 be decided with certainty by the examination of the animals, as 

 Lagochilus is characterised by a glandular slit in the extremity of 

 the foot. Judging, however, from the shells alone, I have very 

 little doubt that the species in question belong to Lagochilus. 

 They differ from the species known to me by the absence of elevated 

 spiral lines or keels and by the more conically elevated, almost 

 pyramidate shape, but I do not think it necessary to create a 

 special section for them, at least not before the geographical dis- 

 tribution of Lagochilus is more fully known. The genus ranges 

 from India and China to the Philippines, the Malayan Archipelago 

 and New Guinea {L. trilirahim, Pfr., jjoirierii, Tapp.-Can., and 

 perhaps also rugatellum, Tapp.-Can., described as Cyclotus). I 

 am all but sure that Cyclophorus liricinctus, Bens., and C. orbicu- 

 latus, Bens., from Western Australia, both of which are described 

 with " apertura superne angulata," the latter besides " subcanali- 

 culata," belong to our genus. Cyclophorus tvhitei, Braz., of Fitzroy 

 Island, might also be a Lagochilus, but possibly as well a Ditropis, 

 as Brazier contends. The genus may yet be discovered on the 

 Melanesian islands; Cyclophorus fornicatus, Pfr., from the New 

 Hebrides, I feel inclined to con.sider a representative of Lagochilus. 



