CORBULA, 



•E II. 



Species 9. (Mus. Cuming.) 



Corbi la nuciformis. Cur/i. testd ovatd, subaquivalvi, 

 gibbosissimd, postici rotundatd, anticl angu- 

 lato-carinulatd, rostrald . albida ; valvis versus mar- 

 ginem silicosis; umbonibus centralibus. 

 The nut-shaped Corbula. Shell ovate, nearlj equi- 

 valve, thick, very gibbous, rounded posteriorly, an- 

 gularly keeled and beaked anteriorly ; whitish ; 

 valves full of small grooves towards the margin ; 

 umbones central. 

 Sowerby, Pro. Zool. Soc, 1833, 

 // 5 1; i'i I.! os, < entral America (dredged from sandy 

 mud at the depth of seven fathoi ; < uming. 

 The Corbula nuciformis approximates very closely to 

 rbula nasuta; it wants however the anterior pro- 

 longation distinctive of that species, and may bi 

 recognised by its peculiar, rounded, nut-like form. 



Species 10. (Fig. a and /;, Mus. Cuming.) 

 Corbula nucleus. Curb, testd subgloboso-trigi 



terdmn deprcssiusculd, valdi intequivalvi, postici ro- 

 tundata, antic't obsoletl angulato-carinulatd ; pallidd, 

 interdum rubido-incarnato tinctd; valvd dextrd la-ci, 

 sinistra versus marginem subli/issimi sulcata. 

 The kernel Corbula. Shell somewhat globosely tri- 

 angular, sometim ri ssed, very inequi- 

 valve, rounded posteriorly, obsoletely angularly 

 keeled anteriorly; pale, sometimes stained with 

 reddish flesh-colour; right valve smooth, left valve 

 verj finely grooved towards the base. 

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

 p. 139 ; EncyclopSdie Methodique, pL -J30. f. 4. 

 Tellina gibba, Olivi. 

 Corbula gibba, Brocchi. 

 Mya intequivalvis, Montague. 



• iin, Mediterranean, cVc. 



This ancient and well-known species is the only one 

 of the genus that is found upon our shores, and the Bri- 

 tish specimens (Fig. b) are generally larger than those 

 from the Mediterranean (Fig. a). 



semipellucidd, pasta', rotundatd, antice obtuso-angu- 

 latd : valvis longiludinaliter striatis it sulcatis, sulci* 



in mini sinistra naijoriliiis. striisi/nc sitliti/issiinis, ab 

 umbonibus profuse dicerijeiitilms, minutissimi exsculp 

 lis ,- intiis iillin. dentibus roseo tinctis. 



I'm pali Corbula. Shell elongately ovate, thin, semi- 

 transparent, rounded posteriorly, obtusely angu- 

 lated anteriorly ; valves longitudinally striated and 

 grooved I ol the lefl valve being larger 



than those ut the right, and very minutely sculptured 

 with a number of exceedingly fine stria- diverging 

 from the umbones ; interior of the shell white, 

 teeth stained with deep rose. 



IIin ds, Pro /' io] Soc, 1 s 4'i. 



d from sandy mud at the depth 

 of seven fathom-) ; Cut 



Onlv a single specimen of this very interesting species 

 has been observed at present; it comes nearer perhaps 

 to tin Corbula erythrodon than any other. 



Species 11. (Mus. Cuming.) 

 Corbula pallida. Curb, testd elongato-ovatd, tenia, 



1 2 (Mus • inning ) 



Corbula fasciata. Curb, testa elongato-rhombiformi, 

 tenui, depressiusculd, latere anticoprodui tiore .- valvis 

 ambabus lavibus, out obsolete striatis, umbonibus an- 

 tice directis ; ant rubidd, nut lutescenle-albd, nut lu- 

 tescente-albd rubido divergente fasciatd. 



The BANDED Corbula, Shell elongately diamond- 

 shaped, thin, rather depressed, anterior side the 

 more produced; both valves smooth or obsoletely 

 striated, umbones directed anteriorly; either red- 

 dish, yellowish white or yellowish white diver- 

 gently banded with red. 



Hinds, Pro. Zool. Soc, 1S43. 



Hub. Philippine Islands; turning. 



The Curhiilu fusciutu differs from the foregoing species 

 in a particular of no inconsiderable importance, namely, in 

 having the umbones curved in the anterior direction, as 

 in the Mi/a, Anatinte, Panopate, &c. I say (interior, in 

 accordance with the opinion of Lamarck, but in oppo- 

 sition to that of Mr. Sowerby, because, as the anterior 

 portion of an acephalous mollusk is obviously that part 

 through which it receives nourishment, I think it not 

 unfair to hazard some conjecture that the skin-like ap- 

 pendage, which generally envelopes the produced extre- 



September 1843. 



