480 PROCEEDINGS OF THE ACADEMY OP 



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. 



Gastrochaena 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 testae vix aequante, 

 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. 



Hab. 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. 



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



Th. Miiller, 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, laevi, dorso longitudinaliter 

 striato ; latere antico brevi ; hiatu duos trientes testae sequante. 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. 



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



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

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

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

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

 striis anticis regularibus extremitate detectis, aequidistantibus, arcuatis et in 

 medio evanescentibus et medianis interpositis, striis medianis inaequalibus, 

 majoribus distantibus ; latere antico brevissimo, fere nullo ; umbonibus 

 minimis, subterminalibus." Deshayes. 

 Hab. ? Coll. Cuming. 



8. R. laevigata, Deshayes, sp. 



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

 Rocellaria laevigata, 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 testae paulo 

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

 mediam partem arcuatis et evanescentibus ; umbonibus minimis, obliquis, 

 approximatis, latere antico brevissimo, recto." Deshayes. 

 Bab. ? Coll. Cuming. 



