436 Mr. E. J. L. Guppy on the Terrestrial 



ever, that, in view of their affinities, the name Conulus is the 

 proper one for the group. The name Stenopus cannot be 

 allowed to stand, having been preoccupied for a crustacean. 

 Such shells as Conulus semen-Uni and C. GundlacM are evi- 

 dently not separable from the present group. The mucus- 

 pore and retractile appendage on the truncate tail are found in 

 the genus Nanina and also in Zonites (as restricted in ' Die 

 Heliceen' of Albers) ; and Conulus vacans has also the median 

 part of the foot defined as in Nanina (e. g. Helicarion Frey- 

 cineti). I think, therefore, that the best classification will be 

 ,to refer to Zonites all those species (of the group now under 

 consideration) in which a caudal appendage exists. Conulus 

 will thus form a section of Zonites comprising the minutely- 

 perforated trochiform species. To the group jEgopis will be 

 assigned those species having shells like Stenopus cruentatus. 

 Guild., S. Guildingi, Bland, and Helix nitensoides^ D'Orb. 

 The genus Hyalina will then consist of the species, such as 

 H. cellaria and H. nitens^ which have no caudal appendage. 



3. Helix diminuta^ C. B. Adams. 

 4. Helix perplexa^ Fdr. 

 I did not collect this species myself; but I have received 

 examples of it from a former Governor of Grenada, His Ex- 

 cellency Mr. Keate. 



5. Plekocheilus glaher^ Gmelin. 



var. grenadensis. 

 This differs from the Trinidad shell described by me as P. 

 auris-sciuri in its greater solidity and more ventricose figure, 

 and in being less impressed in the middle of the last whorl. 

 Its lip is thicker, and its columellar tooth more prominent. 

 In all these respects, except the compression of the last whorl, 

 it agrees better with the Brazilian P. glaber than the Trinidad 

 form does. 



6. Bxdiniidus indistinctus^ n. sp. 



Testa subporforata, tenuis, oblongo-conica, ventricosa, pallido- 

 bninnea vel lutesceus ; anfr. 6, regulariter accrescentes, ultimus 

 ventricosus, | testae longitudinis aequans ; spira cornea, apex 

 acuminatus ; apertura oblongo-ovalis ; peristoma simplex, acutum, 

 baud expansum ; margine cohimellari reflexo. 



Long. 23 millim., lat. 12; aperturae long. 11, lat. 6. 



Shell subperforate, somewhat thin, oblong-conic, rather 

 ventricose, pale reddish brown or inclining to yellowish white ; 

 whorls 6, gradually increasing, the last somewhat ventricose, 

 equal to about two-thirds of the length of the shell ; spire 



