6 
56 
antice rotundata, postice ab umbonibus ad marginem posticam an- 
gulata, value dextre margine ventrali acutd, inflerd ; umbonibus 
levigatis, rectis ; intts prope cardinem rosed. Long. 74; lat. 3; 
alt. 5 lin. 
Hab. r 
Cab. Cuming. 
CorsuLa simitis. Corb. testd ovatd, solidd, sulcatd, antice ele- 
vatiusculd, rotundatd, postice ad marginem posticam oblique trun- 
catd, ab umbonibus angulatd ; valvis inequalibus, dextrd margine 
ventrali subacutd, productd ; umbonibus subobliquis ; intis rosed, 
dente valv@ sinistre bifido. Long. 6; lat. 8; alt. 4 lin. 
Hab. Island of Corregidor, Bay of Manila; in seven fathoms, 
coarse sand. 
Cab. Cuming. 
CorsuLa scaPHorpEs. Corb. testd oblongd, ordinate sulcatd, in- 
terstitiis levissime striatis, antice rotundatd, postice elongatd, ad 
extremitatem oblique truncatd, ab umbonibus subcarinatd ; valve 
dextre margine ventrali acuta, productd ; umbonibus rectis. Long. 
6; lat. 24; alt. 34 lin. 
Hab. Singapore; from seven fathoms, sandy mud. Bais, island 
of Negros, Philippines. 
Cab. Cuming. 
Corsuxa FraciLis. Corb. testd ovatd, tenui, albidd, striatd, striis 
transversis minutissimé reticulata, anticé subproductd, rotundatd, 
postice elongatd, ab umbonibus subrotundatd ; valve dextre mar- 
gine ventrali acutd, productd ; umbonibus rectis, levigatis, equali- 
bus. Long. 7; lat. 3; alt. 4 lin. 
Hab. West coast of Veragua; from eighteen fathoms, mud. 
Cab. Belcher. 
CorsBuLa atBucinosa. Corb. testd retuso-ovatd, tenui, antice ro- 
tundatd, postice subelongatd, rotundatd ; valvis valdé disparibus, 
dextrd longitrorsum striatd, pallida, margine ventrali productd, 
acutd, sinistrd levigatd, lineis elevatis radiantibus, epidermide 
Suscd indutd ; umbonibus albidis, nitidis, inequalibus. Long. 44; 
lat. 2; alt. 33 lin. 
Hab. New Guinea; Straits of Macassar: from seven to twenty- 
two fathoms, mud and coarse sand. 
Cab. Belcher. 
CorpuLa rotaLis. Corb. testd oblongd, corned, antice rotunduatd, 
postice subnasutd ; valvis valde disparibus, dextré precipue maxi- 
md, rotundatd, sulcatd, margine ventrali productd, acutd, sinistrd 
parvd, lineis decenis elevatis radiantibus ; umbonibus valde inequa- 
libus, subobliquis, anticis. Long. 23; lat. 14; alt. 14 lin. 
Hab. Calapan, Mindora, Philippine Islands ; from fifteen fathoms, 
coarse sand. 
Cab. Cuming. 
Several species of Corbula are provided with elevated lines radia- 
