C R B U L A. 



(Figures moderately magnified. 1 



16. (Mus. Belcher.) 

 . ilbuginosa. Corb. testd orbiculari-ovatd, 

 lemd, epidermide fused indutd, latere nntico subex- 

 • alvis regulariter convexis, valde disparibus; 

 sinistra' admodum majore, longitudinaliter striata, 

 striis elevatis, confertis ; dextrd kevigatd, lineis per- 

 paucis elevatis irregulariter radiatd ; umbonibus ul- 

 bido-lutt set ntibus, nitidis. 



The eye-sfotted Corbula. Shell orbicularly ovate, 

 thin, covered with a brown epidermis, anterior side 

 somewhat expanded ; valves regularly convex, very 

 unequal ; left valve very much the larger, longitu- 

 dinally striated, stria' raised, close-set; right valve 

 smooth, irregularly rayed with a few raised lines ; 

 umbones wliitish yellow, shining. 



M;m-. Pro. Zool. Soc, 1843. 



N W Guinea, and Straits of Macassar (found in 

 mud and coarse sand at the depth of from -even to 

 twenty-two fathoms) ; Hinds. 

 Not much unlike the Vorbula nucleus. 



Species 17. (Fig. a and b, Mus Cuming.) 

 i \ fab a. Curb, testd elongato-ovali, subc 

 ra/i, tenui, lavigatd, latere antico vix angulato ; al- 

 bidd, fuscescente-rubro interdum triradiatd ; umbo- 

 nibus minimis, recti incurvis. 

 'I'm beak Cohbula. Shell I I '!:.. il • '1 v oval, nearly 

 ral, thin, smooth, anterior side slightly an- 

 gulated ; whitish, sometimes ornamented with three 

 broad rays of brownish red ; umbones very small, 

 straight!}- incurved. 

 Hinds, Pro. Zool. Soc, 184;;. 



Ilab. St. Miguel, east coast of the island of Luzon, 

 Philippines (obtained iu the mud at low water) ; 

 Hind,. 

 This species approximates very closely to the Corbula 

 fasciata ; it is however smaller, and the anterior side 

 is much less angularly produced, the umbones are less 

 prominently developed, and they are not directed an- 

 teriorly. 



Species IS. (Mus. Forbes.) 

 OVATA. Corb. testa tenui. subelonyato-ova/i. 

 longitudinaliter subtilissime striatd, albidd, epider- 

 mide tenui fuscescente indutd ,■ lateribus rotundatis, 



antico paululum product lore, subtruncuto ; umbonibus 

 depressiusculis. 

 The ovate Corbula. Shell thin, rather elongately 

 oval, longitudinally very finely striated, whitish, 

 covered with a slight brownish epidermis ; sides 

 rounded, anterior side a little more produced, 

 slightly truncated ; umbones rather depressed. 



Forbes, Malacologia Monensis, p. .">•'!. pi. 2. fig, 8 and '■>. 

 Hah. Ballaugh, Isle of Man (taken from the root of a 



fucus) ; Forbes. 



Notwithstanding the indefatigable zeal with which 

 Prof. I-'.. Forbes dredged the entire coast of the Isle of 

 Man, the specirn red is the only one of the 



genu-- he ever met with; and it is extremely interesting, 



on account of th> speci never having been previously 



found either on the coast of Britain or elsewhere. 



Species 19. (Mus. Belcher.) 

 I i pragilis. Corb. testd ovato-rhomboided, tenui, 



st mipellucidd, alb<i, longitui/ina/iti r striata, striis ele- 

 vatis, numerosis, eon/ertis, lineis e.ii/issimis all tiitilm- 



liantibus, decussatis; latere antico angulato- 



produCtO ; umboni/iiis dcjiressiuseu/is, recti incurvis. 



The fragile Corbula. Shell ovately diamond-shaped, 

 thin, semi-transparent, white, longitudinally stri- 

 ated, stria 1 raised, numerous, close-set, crossed with 

 exceedingly fine lines radiating from the umbones; 

 anterior side angularly produced ; umbones rather 

 di pressed, straightly incurved. 



Hinds, Pro. Zool. Soc, 1843. 



Ilab. "West coast of Yeragua, Mexico (found in mud at 

 the depth of eighteen fathoms) ; Hinds. 

 The finely decussated sculpture of this shell is very 



characteristic. 



Species '20. (Mus. Cuming.) 

 Corbula l^vis. Corb. testd ovali, eequilaterali, tenui- 



January 1844. 



