CORBULA.— Plate V. 



liduld, Icevigatd, marmoratd, postice rotundatd, antiee 

 subangulatd ; valvarum marginibus ventralibus in- 

 clausis; umbonibus obliquis, posticis ; ante umbones 

 sanguineo maculatd. 



The marbled Corbula. Shell small, oblong, solid, 

 smooth, marbled, posteriorly rounded, anteriorly 

 rather angular ; ventral margins of the valves closed 

 in ; umbones oblique, posterior ; spotted with pur- 

 plish red before the umbones. 



Hinds, Pro. Zool. Soc, 1843. 



Hab. West coast of Veragua, South America (found in 



mud at the depth of twenty-six fathoms) ; Hinds. 



Distinguished from the other minute species by the 



reddish tinge about the umbones. 



Species 40. (Mus. Metcalfe.) 



Corbula quadrata. Corb. testa quadratd, albidd, tenui, 

 Itevigatd, ventricosd, subpellucidd, postice rotundato- 

 truncatd, antiee rotundato-angulatd, abbreviatd ; um- 

 boiiibus obliquis, posticis, incurvis. 



The square Corbula. Shell square, white, thin, 

 smooth, ventricose, somewhat transparent ; poste- 

 riorly rotundately truncated, anteriorly rotundately 

 angulated, abbreviated ; umbones oblique, posterior, 

 curved inwards. 



Hinds, Pro. Zool. Soc., 1843. 



Hab. ? 



This is a very characteristic species, and may be iden- 

 tified from the accompanying figure without difficulty. 



Species 41. (Mus. Cuming.) 

 Corbula solidula. Corb. testd parvd, ovatd, subtri- 

 gond, soliduld, elevatiusculd, subtequilatera/i, sulcata, 

 postice rotundatd, antiee angulatd ; valvarum margi- 

 nibus ventralibus inclausis ; umbonibus rectis, Itevi- 

 gatis. 

 The solid Corbula. Shell small, ovate, somewhat 

 triangular, solid, rather elevated, nearly equilateral, 

 posteriorly rounded, anteriorly angulated ; ventral 

 margins of the valves closed in ; umbones straight, 

 smooth. 



Hinds, Pro. Zool. Soc, 1843. 



Hab. Bais, island of Negros, Philippines ; Cuming. 

 Straits of Macassar ; Hinds. 

 This and the following species approximate very 

 closely. 



Species 42. (Mus. Cuming.) 

 Corbula eburnea. Corb. testd pared, ovatd, subtrigouu, 

 subaquilaterali, eburned, soliduld, complanutd, lavi- 

 gatd, obsolete sulcata ; margine ventrali gibbosd ; 

 umbo >i Hi us parvis, subrectis, nitidis. 

 The ivory Corbula. Shell small, ovate, somewhat 

 triangular, nearly equilateral, ivory-white, rather 

 solid, flat, smooth, obsoletely grooved ; ventral 

 margins gibbous ; umbones small, nearly straight, 

 shining. 

 Hinds, Pro. Zool. Soc, 1S43. 



Hab. Islands of Camiguing and Bohol, Philippines (found 



in coarse sand at the depth of seven fathoms) ; 



Cuming. North coast of New Guinea (found in 



mud at the depth of sixty fathoms) ; Hinds. 



" This shell," says Mr. Hinds, " closely approaches 



the Corbula solidula, but is distinguished by its somewhat 



more triangular shape, polished, ivory-like, flattened 



valves, and the slightly sulcate sculpture." 



Species 43. (Mus. Cuming.) 



Corbula crispa. Corb. testa ovatd, solidiusculd, albidd, 

 postice rotundatd, antiee productd, extremitate trun- 

 eald. nb umbonibus obtuse eiiriimtd ; vulva sinistrd 

 subtiliter sulcata, margine vulde proi/uc/o, dextrd fere 

 Itevigatd ; umbonibus subeentralibus. 



The curled Corbula. Shell ovate, rather solid, 

 whitish, posteriorly rounded, anteriorly produced, 

 truncated at the end, obtusely carinated from the 

 umbones ; left valve finely grooved, margin con- 

 siderably produced, right valve almost smooth ; 

 umbones nearly central. 



Hinds, Pro. Zool. Soc, 1844. 



Hub. Island of Burias, Philippines. 



The Corbula described in this Plate are all represented 

 of about twice the natural size. 



