270 Mr. E. A. Smith on the 



in a future report on some Bornean land-shells, now in course 

 of preparation. It is a satisfaction to record that the British 

 Museum possesses examples of all the known forms, and the 

 types of the nine species described by myself have been most 

 liberally presented by Mr. A. Everett, to whom the chief 

 credit is due of having discovered the majority of these very 

 remarkable shells. 



The following is a complete list of the known species, 

 arranged in order of publication : — 



1. Opisthostoma Decrespignyi (H. Adams). 



Plectostoma De Crespignii, H. Adams, Ann. & Mag. Nat. Hist. 1865, 



vol. xv. p. 177. 

 Opisthostoma De Crespignii, W. T. Blanforcl, Ann. & Mag. Nat. Hist. 



1867, vol. xix. p. 305. 

 Plectostoma Decrespignyi, Issel, Ann. Mus. civ. Storia nat. 1874, vol. vi. 



p. 439, pi. vi. figs. 13-15. 

 Opisthostoma Decrespignyi, Godwin-Austen, Proc. Zool. Soc. 1889, 



p. 350. 



Hab. Labuan {H. Ad.), Borneo (Issel). 



2. Opisthostoma Wallacei (Ancey). 



Plectostoma Wallacei, Ancey, Bull. Soc. Mai. France, 1887, p. 276. 

 Opisthostoma Wallacei, Smith, Journ. Linn. Soc. 1893, Zool. vol. xxiv. 

 p. 347, pi. xxv. figs. 14, 14 a. 



Hab. Borneo {Ancey), Busau, West Sarawak {Smith). 



3. Opisthostoma grandi-spinosum, Godwin- Austen. 



Opisthostoma grandi-spinosum, G.-A., Proc. Zool. Soc. 1889, p. 350, 



pi. xxxviii. figs. 2, 2 a. 

 Geothauma grandispinosum, Crosse, Journ. de Concli. 1892, p. 283, 



pi. iv. figs. 1-1 c. 

 Opisthostoma grandispinosum, Smith, Science Gossip, 1894, vol. i. 



p. 6 (cut). 



.Hab. Niah Hills, Sarawak. 



4. Opisthostoma pulchellum, Godwin-Austen. 



Opisthostoma pulchella, G.-A., Ann. & Mag. Nat. Hist. 1890, vol. vi. 

 p. 245, pi. vii. fig. 1. 



Hab. Baram {G.-A.) ; Mulu, Tampasang, and Barit 

 Mountain (A. Everett). 



The specimens from Barit Mountain have a thicker and 

 less conical spire than typical examples ; but as they agree 

 in every detail of sculpture, I think it advisable to regard 

 them at present in the light of a variety rather than as a 

 distinct species. 



