CRASSATELLA. 



Plate II. 



Species 6. (Fig. a, Mus. Cuming; Fig. b, Mus. 

 Stainforth.) 



Crassatella sulcata. Crass, tcstd ovato-trigond, valde 

 inaquilaterd, gibbd, transversim sulcato-plicatd ; la- 

 tere antico rotunduto, postico angulato, production. 



The grooved Crassatella. Shell ovately triangular, 

 very inequilateral, gibbous, transversely plaited and 

 grooved ; anterior side rounded, posterior angular, 

 and more produced. 



Lamarck, Anim. sans vert. (Deshayes' edit.), vol. vi. 

 p. 110. 



Hub. Coast of New Holland. 



The shell which I assign to this species is generally 

 understood to be the Crassatella sulcata of Lamarck, and 

 it is much to be regretted that M. Chenu has omitted to 

 publish it in Delessert's 'Recueil de Coquilles.' De Blain- 

 ville and Deshayes both attribute to this species the shell 

 which I have figured under the title of Crassatella pul- 

 r/ira (vide pi. 3. f. 16.), but it does not agree so well 

 with Lamarck's description. 



Species 7. (Mus. Cuming.) 



Crassatella lapidea. C?'ass. testd ovato-orbiculatd, 

 epidermide fibrosa sparsim indutd; umbonlbus pur- 

 vis, striatis ; intus subfuscd; latere antico rotundato, 

 abrupt o, striis nonnullis brevibus ornato ; postico sub- 

 angulato. 



The stont Crassatella. Shell ovately orbicular, co- 

 vered with a scattered fibrous epidermis; umbones 

 small and striated ; interior brownish ; anterior side 

 rounded ; posterior somewhat angular. 



Reeve, Proceedings Zool. Soc, 1842, p. 43. 



Hub. Island of Negros, one of the Philippines. 



A single pair and several odd valves of this shell were 

 dredged by Mr. Cuming from coarse sand in seven fa- 

 thoms water at the Island of Negros. The heavy stony 

 nature of the shell has suggested the above name. 



Species 8. (Mus. Cuming.) 

 Crassatella Antillarum. Crass, testd trigono-ovatd, 

 vix gibbosd, crassd, epidermide fibrosii indutd ; intus 

 brunned, prope marginem albicante ; umbonibus sub- 

 depressis, leviter undulatis ; latere antico rotundato, 

 postico subungulato . 



The Crassatella of the West Indies. Shell tri- 

 angularly ovate, slightly gibbous, thick, and covered 

 with a strong fibrous epidermis ; interior deep cho- 

 colate-brown, white near the margin ; umbones a 

 little depressed, and faintly undulated ; anterior side 

 rounded, posterior rather angular. 



Reeve, Proceedings Zool. Soc, 1S42, p. 44. 



Hub. Island of Margaritta, West Indies. 



This magnificent shell, which Mr. Cuming informs me 

 was dredged at the Island of Margaritta, in the pearl 

 fisheries, has the same rich chocolate-coloured interior 

 as the Crassatella undulata, and it approaches nearer in 

 most respects to that species than any other. It is 

 almost a matter of surprise that the Crassatella Antilla- 

 rum should be one of such extreme rarity ; the beautiful 

 shell, however, which M. Chenu has erroneously figured 

 as an example of the Crassatella rostrata, may probably 

 be another variety of it. 



Species 9. (Mus. Stainforth.) 



Crassatella Corbuloides. Crass, testd suborbiculatd, 

 vald'e gibbosit, umbones versus profundi' sulcatd, epi- 

 dermide fused indutd; latere antico rotundato, postico 

 producto, subitb rostrato. 



The Corbula-shaped Crassatella. Shell somewhat 

 orbicular, very gibbous, deepty grooved towards the 

 umbones, and covered with a brown epidermis ; an- 

 terior side rounded, posterior produced, suddenly 

 beaked. 



Reeve, Proceedings Zool. Soc, 1842, p. 45. 



Hab. ? 



The shell which I have here described and figured 

 under the above title is assuredly distinct from any other 

 species. Its short gibbous form reminds us somewhat 

 of the Crassatella gibbosa, but the umbones are not de- 

 pressed as in that species, and the shell differs as ma- 

 terially in other respects. 



Species ID. (Mus. Stainforth.) 

 Crassatella rostrata. Crass, testd ovato-trigond, ros- 

 tratii, Itevigatd, lineis rectis numerosis, ad margines 

 ab umbonibus diver gentibus, per totam supcrficiem 

 ornutd ; epidermide brunned, tenui, politd, indutd , 

 latere antico rotundato, postico production, subangu- 

 lato; intus albicante, margine crenulato. 



fan. 1S4?. 



