58 
CorsuLa souipuLa. Corb. testd parvd, ovatd, subtrigond, soliduld, 
elevatiusculd, equilaterali, sulcatd ; antice rotundatd, postice an- 
gulatd ; valvarum marginibus ventralibus inclausis, gibbosis ; um- 
bonibus rectis, levigatis. Long. 2; lat. 1 ; alt. 14 lin. 
Hab. Straits of Macassar ; from seven fathoms, coarse sand. Bais, 
island of Negros, Philippines. 
Cab. Belcher et Cuming. 
CorspuLa MARMORATA. Corb. testd parvd, oblonga, soliduld, levi- 
gatd, marmoratd, antice rotundatd, postice subangulata ; valvarum 
marginibus ventralibus inclausis ; umbonibus obliquis, anticis ; ante 
umbones sanguineo maculatd. Long. 2; lat. 1; alt. 14 lin. 
Hab. West coast of Veragua; from twenty-six fathoms, mud. 
Cab. Belcher. 
CorBuLA EBURNEA. Corb. testd parvd, ovatd, subtrigond, eburned, 
soliduld, complanatd, levigatd, obsolete sulcatd ; margine ventrali 
gibbosd ; umbonibus parvis, subrectis, nitidis ; inttis corned, Long. 
2; lat. 1; alt. 14 lin. 
Hab. North coast of New Guinea; Camaguing and Bohul, Phi- 
lippine Islands : from seven to sixty fathoms, coarse sand and mud. 
Cab. Belcher et Cuming. 
This shell closely approaches C. solidula, but is distinguished by 
its somewhat more triangular shape, polished, ivory-like, flattened 
valves, and the slightly sulcate sculpture. 
Corsuta moniLis. Corb. testd minutd, globosd, pallidd, striulatd ; 
valvis valde inequalibus, dextrd multd maximd, postice elongatd, 
margine ventrali acutd, productd; umbonibus rectis, levigatis. 
Long. 1; lat. 2; alt. 2 In. 
Hab. Sual, Luzon, Philippine Islands ; from five to seven fathoms, 
sandy mud. 
Cab. Cuming. 
A small globose species remarkable for the inequality of the valves, 
the left being sunk into the right. The latter valve is also distin- 
guished by the posterior nasute elongation. 
Corsuta FasciaTa. Corb. testd ovatd, subtrigond, levigatd, pallidd, 
atro-fusco trifasciatd, antice productd, rotundatd, postice elongatd, 
ab umbonibus arcuate angulatd ; valvarum marginibus ventralibus 
acutis, convexis, dextre productd ; umbonibus rectis, suberosis. 
Long. 64 ; lat. 23; alt. 4 lin. 
Var. Testd pallidd, postice subproductiori. 
Hab. St. Juan, province of Ilocos, and Agoo, province of Panga- 
sinan, Luzon, Philippine Islands. 
Cab. Cuming. 
CorsuLa TRIGoNa. Corb. testd trigond, levigatd, pallidd, fuscd, 
vel obsolet? unifasciatd, antice rotundatd, postice abbreviatt, ab 
umbonibus angulatd ; valve dextre margine ventrali acutd, pro- 
ductd ; umbonibus rectis. Long. 43; lat. 2; alt. 4 lin. 
Hab. Senegal. 
Cab. Cuming et Metcalfe. 
