CORBULA. 



Species 2.">. (Mus. Cuming.) 



CORBULA USTULATA. Curb, test.i elungato-ovata , luri, 



valde intequivalvi, postici rotundatd, antic'i subacu- 

 minatd; albidd, purpurascente- et rufescente-fusco 

 tinctd, epidermide tenui indutd . umbonibus eburneis. 

 1'hk scorched Corbula. Shell elongately ovate, 

 smooth, very inequivalve, rounded posteriorly, 

 somewhat acuminated anteriorly; whitish, stained 

 with purplish and reddish brown, covered with a 

 thin epidermis; umbones ivory white. 

 Rbbve, Pro. Zool. Soc, L844. 

 Hnii. Singapore. 



The colour of this shell is very similar to that of the 

 Corbula labiata, but the form of it is much more elon- 

 gated ; the umbones have a more polished appearance. 



Species 26. (Mus. Metcalfe.) 



; 1 rosea. Curb, testa ovatd, tenui, viiliL iiuiqui- 

 valvi, latere postico rolundato, antiro angulato-acu- 

 minato .• longitudinaliter subtilissimi striata, striis 

 valvx sinistrals versus marginem majoribus, eleva- 

 tioribus . roseo-fvscescente, radiis perpaucis roseis 

 orniitd. 



The rosb Corbula. Shell ovate, thin, very inequi- 

 valve, posterior side rounded, anterior angularly 

 acuminated ; longitudinally very finely striated, 

 stria? of the left valve large and more elevated to- 

 wards the margin ; rose-tinted brown, ornamented 

 with a few rose-coloured rays. 



Hub. ? 



The striae of tins interesting little species are carved 

 with remarkable clearness, and have quite a satin-like 

 appearance. 



Species 27. (Mus. Metcalfe.) 

 Arca contracta. Area testa subelungato-ovatd, medio 

 paululum contractd, latere postico rolundato, antico 

 angulato-truneato ; longitudinaliter elevato-striatd ; 

 albidd, epidermide fuscescente indutd ; umbonibus 

 erosis, subcentra/ibus. 

 The contracted Corbula. Shell rather elongately 

 ovate, a little contracted in the middle, posterior 

 side rounded, anterior angularly truncated ; longi- 



tudinally carved with raised stria 1 ; whitish, covered 

 with a light brown epidermis; umbones eroded, 

 nearly central. 



Say, Journ. Acad. Nat. Sci. Philadelphia, vol. ii. p. 312. 



Hab. Georgia and East Florida, United States; Say. 

 All the specimens I have as yet seen of this American 



species are much eroded, and it is probably the nature 



of it to be so. 



Species 28. (Mus. Cuming.) 



Corbula labiata. Curb, testa subtrigono-ovatd, lavi. 

 planiusculd, intequivalvi, lateribus stipend uttenuatis, 

 infra angulato-rotundat is ; ralvd sinistra/i propi um- 

 bonem leviter corrugatd ; albidd, rufescente- aut pur- 

 purascente-fusco tinctd, epidermide fused indutd. 



The full-lipped Corbula. Shell somewhat triangu- 

 larly ovate, smooth, rather fiat, inequivalve, sides 

 attenuated at the upper part, angulately rounded 

 beneath ; left valve slightly wrinkled near the um- 

 bone ; whitish, stained with reddish or purplish 

 brown, covered with a brown epidermis. 



Gray, MSS. British Museum. 



Miju labiata, Maton, Trans. Linn. Sue., p. 32ti, 



pi. 24. f. 1 to 3. 

 l'nliiinomi/a labiata, Hinds. 



Hub. Singapore. 



A solid and more triangularly formed shell than the 

 Corbula ustulata. 



Species 29. (Mus. Cuming.) 



Corbula procera. Corb. testa oblongo-ovatd, lavigatd, 

 postici rotundatd, antici subelongato-acuminatd, ab 

 umbonibus angulatd , rufescente -fused, epidermide 

 corned indutd ; umbonibus erosis. 



The long Corbula. Shell oblong-ovate, smooth, 

 rounded posteriorly, rather elongately acuminated, 

 and angulated from the umbones anteriorly ; red- 

 dish brown, covered with a horny epidermis ; um- 

 bones eroded. 



Hinds, Pro. Zool. Soc, 1S44. 



Hab. ? 



This shell, which is apparently an estuary species, may 



be recognised by its anterior acumination. 



April 1844. 



