CORBUL A. 



(Figures considerably magnified.) 



Species ■"■4. (Mus. Cuming.) 



Corbula rotalis. Cor/i. testd oblongd, corned, postici 



rotundatd, ant ice subnasutii ; valvis ruld~e disparibus, 



pracipue majore, rotundatd, sulcatd, pro- 



ductd, acutd, dextrd parvd, lineis elevatis radiatd ; 



umbonibus raid; inaqualibus, subobliquis, posticis. 



The wheel-like Corbula. Shell oblong, horny, 



rounded posteriorly, protruded anteriorly ; valves 



very unequal, left valve very much the Larger, 



rounded, grooved, produced, sharp, right valve 

 small, raved with elevated lines ; umbones very 

 unequal, rather oblique, post 



Hinds, Pro, Zool. Soc, 1843. 



H Calapan, island of Mindoro, Philippine Islands 



(found in coarse sand at the depth of about fifteen 



fathoms) ; Cuming, 



This species has somewhat the form of our common 

 Briti-h ( 'orbula nucleus. 



35. (Mus. Cuming.) 

 Corbula monilis. Corb. testd minutd, globosd, pallida, 



striatulatd, valvis valde inrn/ualibus, sinistnl mult!) 



majore, antic! elongatd, productd ; umbonibus rectis, 



lizvigatis. 

 The necklace-bead Corbula. Shell minute, globose, 



pale, a little striated, valves very unequal, left valve 



much the larger, anteriorly elongated, produced ; 



umbones straight, smooth. 

 Hinds, Pro. Zool. Soc.. 1S43. 

 Hub. Sual, island of Luzon, Philippines (found in sandy 



mud at the depth of from five to seven fathoms). 

 The smallest species of the genus at present known, 

 and remarkable on account of the manner in which the 

 right valve is sunk in the left. 



Species 36. (Mus. Cuming.) 



Corbula polita. Corb. testd oblongd, ventricosd, tenui, 

 albidd, obsolete siileatd, postici rotundatd, antice ab 

 umbonibus subungulatd ; valvis fere aqualibus, sinis- 

 tra margine ventrali acutd, subproductd ; umbonibus 

 aqualibus, lavigatis, rectis. 



The polished Corbula. Shell oblong, ventricose, thin, 

 whitish, obsoletely grooved, posteriorly rounded, 

 anteriorly rather angular from the umbones ; valves 



almost equal, ventral margin of the left valve sharp. 



rather produced : umbones equal, smooth, straight. 

 Hinds, I'm. Zool. Soc. 1843. 

 Huh. Sorsogon, province of Albay, island of Luzon. 



Philippines ; ( Juming, 



Not so highly polished as the Corbula eburnea and 



Species 37. (Mus. Cuming.) 



Corbula carnosa. Corb. testd ovatd, solidd, subaqui- 

 laterali, postici rotundatd, antici truncato-angulatd, 

 breviter attenuatd, pallida, carnoso-roseo radiatd, val- 

 vis ambabus subti/issim'e su/ca/is, marginibus ventra- 

 libus inclausis ; umbonibus lavigatis, subcentralibus. 



The fleshi Corbula. Shell ovate, solid, nearly equi- 

 lateral, posteriorly rounded, anteriorly truncately 

 angulated, a little attenuated , pale, rayed with 

 fleshy ruse ; both valves very finely grooved, ventral 

 closedin; umbones smooth, nearly central. 



Hinds, Pro. Zool. Soc, 1844. 



Hob. ? 



This is an exceedingly pretty species ; locality un- 

 known. 



I Mus Belcher.) 

 Corbula obesa. Corb. testd ovatd, tenui, ventricosd, 

 pallida, striata, postici rotundatd, antice ad extremi- 

 tatem truncatd, ab umbonibus acute angulatd; valva- 

 rum marginibus ventralibus inclausis, gibbosis ; um- 

 bonibus rectis, lavigatis. 

 The stout Corbula. Shell ovate, thin, ventricose, 

 pale, striated, posteriorly rounded, anteriorly trun- 

 cated at the end, sharply angled from the umbones ; 

 ventral margins of the valves closed in, gibbous ; 

 umbones straight, smooth. 

 Hinds, Pro. Zool. Soc, 1843. 



Hah. West coast of America (Panama, Veragua, San 

 Bias, &c), found at the depth of from about twenty 

 to thirty-two fathoms ; Hinds. 

 It is impossible to give an accurate idea by lithogra- 

 phic drawing of the various specific differences between 

 the very small Corbula figured in this plate. 



Species 39. (Mus. Belcher.) 

 Corbula harmorata. Corb. testd parvd, oblongd, 



May 1844. 



