1922. ] Revision of Kobelt’s Nomenclature. 587 
latter author as forms or varieties of this species. Having 
examined Nevill’s original specimens and the very large series 
of shells in the Indian Museum, and the type-specimens of 
the various forms in the British Museum, as also large num- 
bers of living specimens from different localities, I have come 
to the conclusion, that the forms encaustica, Reeve ; corrugata, 
Swainson ; sphaerica, Hanley and Theobald ; fasciata, Hanley 
and Theobald; incrassatula, Nevill; minor, Nevill and longi- 
spira, Nevill, are only phases of this variable species, and that it 
is impossible to distinguish them as distinct owing to the great 
variation exhibited by specimens from various localities. The 
question wil! be discussed at length in my detailed paper. 
Pachylabra layardi (Reeve). 
1912. Pachylabra layardi, Kobelt, op. cit., p. 73, Taf. 
xxxiv, figs. 3, 4 
regarded it as a distinct variety of globosa, Swainson. Sowerby 
included it as a variety of virens, Lam. ; while both Kobelt and 
Preston treated it as a distinct species. As a result of a care- 
ful examination of a large series of shells, I am of opinion, that 
the species, though closely allied to both virens and globosa, is 
quite distinct, and is confined to the island of Ceylon. 
Pachylabra layardi (Reeve) var. cinerea (Reeve). 
1912. Pachylabra cinerea, P. Tischberni and P. alucinans, 
Kobelt, op. cit., pp. 89, 100 and 104, Taf. xxxv, 
are all specimens of the same species ; 
is nothing more t 
species P. layardt. 
s Kobelt aoe publishing his account of these forms had 
received specimens of the other species from Sowerby and 
Fulton, and a few notes about these specimens will also be 
included here. 7 
er ree ens received with the label “ Pila globosa var. 
Two specim be 
cinerea, pg tes > in Sowerby’s handwriting, belong to two 
