51 



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



Description. — " R. testa ovato-elongata, angusta, cuneiformi, tenui, alba, 

 oblique truncata, elongato-hiante, hiatu elongato, acuminato, angusciusculo, 

 usque ad tertiam partem posticam testae attingente, transversim striata, striis 

 antice tenuibus, regularibus, sublamellosis, erectis, in medio paulo distanti- 

 oribus, et minus regularibus in area postica tenuissimis ; area postica elongato- 

 angusta, angulo obtuso-distincta ; latere antico brevissimo, ligamento angus- 

 tissimo, partim infosso, breviusculo." — Deshayes. 



Hab. — Singapore. Coll. Cuming. 



18. R. interrupta, Deshayes, sp. 



Gastrochaena interrupta, Desbayes, Zool. Proc. p. 329, 1854. 

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



Description. — " R. testa elongato-angusta, couvexiuscuhi, extremitatibus 

 fere sequaliter lata, per longitudinem quasi excisa, late aperta ; hiatu longis- 

 simo, ovato, oblongo, inferne vix acuto, et fere totam longitudinem testa? 

 sequante ; valvis oculo nudo laevigatis, sublente argutissime striatis, striis 

 obsoletis, distantibus, incrementi distantibus, subcontabulatis, interruptis ; 

 margine inferiore recto, superiore fere parallelo, umbonibus minimis, sub- 

 terminalibus : latere antieo brevi, inclinato ; ligamento angustissimo, brevi." 

 — Deshayes. 



Hab. —Philippines. Coll. Cuming. 



19. R. lamellosa, Deshayes, sp. 



Gastrochaena lamellosa, Deshayes, Zool. Proc. p. 328, 1854. 

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



Description. — " R. testa, elongato-angusta, tenui, fragili, Candida, hyalina, 

 compressiuscula, longe hiante, margine antice paululam excavato, in medio 

 convexo, hiatu longissimo, inferne valde attenuata, fere totam altitudinem 

 testae aequante ; valvis antice valde attenuatis, rostratis, postice obtusis, 

 rotundatis, antice tenuissime striatis, striis erectis, appressis, in medio dis- 

 tantioribus, breviter lamellosis, eleganter armatis, regularibus ; umbonibus 

 minimis, approximatis, subumbilicatis ; latere antico brevissimo, subrostrato ; 

 ligamento angustissimo, nigro." — Deshayes. 



Hab.— Philippines, Zebu. Coll. Cuming. 



20. R. Philippinensis, Deshayes, sp. 



Gastrochaena Philippinensis, Deshayes, Zool. Proc. Lond. p. 328, 1854. 

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

 Description. — "R. testa elongato-angusta, subovata, compressiuscula, tenui, 

 alba, antice inferneque oblique hiante, hiatu ovato, inferne acuminato, di- 

 midiam partem testae paulo superante ; valvis tenue striato-lamellosis ; striis 

 arcuatis, secundum peripheriam valvarum antice tenuibus, approximatis, in 

 medio latioribus, sublamellosis ; margine superiore postico paulo carinato ; 

 umbonibus minimis; latere antico brevi, recto, subrostrato." — Deshayes. 

 Hab.— Philippines, Zebu. Coll. Cuming. 



21. R. R u p p e 1 1 i i , Deshayes, sp. 



Gastrochaena Ruppellii, Deshayes, Zool. Proc. Lond. p. 328, 1854. 

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

 Description. — " R. testa elongato-ovata, solidula, turgidula, Candida, antice 

 oblique hiante; hiatu ovato, late, infere attenuato, fere totam altitudinem. 

 testae asquante ; valvis dense striatis, striis obtusis, antice satis regularibus, 

 appressis, in medio et latere postico distantioribus, irregularibus, obtusis ; 

 umbonibus tumidulis ; latere antico brevi, recto, antice parum inflexo ; liga- 

 mento praelongo, angusto." — Deshayes. 



Hab. — Red Sea. (RUppell.) Coll. Cuming. 



