48 



This species is represented by Chemnitz's figures, Nos. 1678 and 1679. Nos. 

 1680 and 1681 represent R. rostrata. Several writers have confounded the 

 two under one description, although they are really very different. R. h i a n s 

 has also been frequently confounded with R. d u b i a of Europe. 



5. R. humilis,* Deshayes, sp. 



Gastrochsena humilis, Deshayes, Proc. Zool. Soc. Lond. p. 327, 1854. 

 Rocellaria humilis, H. and A. Adams, Genera, ii. p. 336, 1856. 



Description. — "R. testa parva, elongato-ovata, tumida, tenui, alba, hyalina, 

 fragili, apertura antica ovato-acuminata, dimidiam partem testa? vix sequante, 

 oblique secta et rectilinea ; valvis subtrapezoidalibus, regulariter striato- 

 sublamellosis, striis continuis, antice approximatis, in medio paulo distanti- 

 oribus et prominentioribus ; umbonibus tumidulis, approximatis ; latere 

 antico brevissimo, in sutura cristata, parum obliquo ; ligamento angusto, 

 elongato, nigro." — Deshayes. 



Bab.— Philippines, Zebu, (Cuming.) West Indies? Mus. Brit., Gray. 



The hiatus in this species scarcely reaches to the middle of the shell, whilst 

 it is not less than two-thirds the total length in any other species. 



6. R. hyalina, Sowerby, sp. 



Gastrochsena hyalina, Sowerby, Zool. Proc. p. 22, 1834. 



Th. Muller, Syn. Test. Viv. p. 236, 1836. 

 Hanley, Desc. Cat. p. 11, 1842. 

 Catlow, Conch. Nomenc. p. 2, 1845. 

 Rocellaria hyalina, H. and A. Adams, Genera, ii. p. 336, 1856. 

 Description. — " R. testa ovali, albida, hyalina, lsevi, dorso longitudinaliter 

 striato ; latere antico brevi ; hiatu duos trientes testae jequante. Long. 0*55, 

 lat. 0-25, alt. 0-3 poll. "— Sowerby. 

 Hab. — Lord Hood's Isle. 



Sowerby's descriptions of species in this genus are entirely too short and 

 indefinite for satisfactory recognition. Having no specimens, we are not able 

 to give any opinion regarding the validity of his species, and therefore we are 

 compelled to insert them with the original Latin descriptions. 



7. R. intersecta, Deshayes, sp. 



Gastrochsena intersecta, Deshayes, Zool. Proc. London, p. 327, 1854. 

 Rocellaria intersecta, H. and A. Adams, Genera, ii. p. 336, 1856. 



Description. — "R. testa, ovato-oblongii, brevi, cuneiformi, tenui, fragili, 

 Candida, oblique hiante, hiatu ovato, acuminato, dimidiam partem testse 

 sequante, valvis subspathulatis, antice angustis, postice dilatatis, striatis, 

 striis anticis regularibus extremitate detectis, sequidistantibus, arcuatis et in 

 medio evanescentibus et medianis interpositis, striis medianis insequalibus, 

 majoribus distantibus ; latere antico brevissimo, fere nullo ; umbonibus 

 minimis, subterminalibus." — Deshayes. 



Hab. ? Coll. Cuming. 



8. R. laevigata, Deshayes, sp. 



Gastrochsena laevigata, Deshayes, Zool. Proc. Lond. p. 326, 1854. 

 Rocellaria lsevigata, H. and A. Adams, Genera, ii. p. 336, 1856. 

 Description. — " R. testa ovato-cuneiformi, tenui, pellucida. fragili, candidis- 

 sima, ventricosa, late hiante, hiatu cordiformi, dimidiam partem testse paulo 

 superante ; valvis lsevigatis ; latere antico striis aliquibus regularibus, ad 

 mediam partem arcuatis et evanescentibus ; umbonibus minimis, obliquis, 

 approximatis, latere antico brevissimo, recto." — Deshayes. 

 Hab. ? Coll. Cuming. 



9. R. macroschisma, Deshayes, sp. 



Gastrochsena macroschisma, Deshayes, Proc. Zool. Soc. p. 326, 1854. 

 Rocellaria macroschisma, H. and A. Adams, Genera, ii. p. 336, 1856. 

 Description. — "R. testa, ovata, brevi, ventricosa, tenui, fragili, Candida, 



