78 
Ne#ra pipyma. UN. testd oblongd, levigatd, albd; costis duabus 
radiantibus ; margine dorsali antico prominulo ; rostro lato, sub- 
truncato. Long. 3; lat. 2; alt. 2 lin. 
Hab. The west coast of Veragua, in twenty-six fathoms, mud; in 
society with N. costata. 
Cab. Belcher. 
On the anterior and ventral margin there is a disposition to the 
formation of a number of small ribs; the shell is otherwise smooth 
and left to the occupation of the two prominent ribs, which eminently 
distinguish it. 
Ne#RA RosEA. UN. testd oblongd, albidd, epidermide tenui striatd 
indutd ; valvis inequalibus, dextrd majori ; rostro attenuato, roseo. 
Long. 35; lat. 12; alt. 2 lin. 
Hab. New Guinea, in seven fathoms, mud; Cagayan, island of 
Mindanao ; San Nicholas, island of Zebu, Philippines, in from five to 
thirty fathoms, sandy mud. 
Cab. Belcher et Cuming. 
Not unlike diminutive specimens of N. cuspidata; the anterior por- 
tion of the shell, however, does not occupy more than a third of its 
entire length; the beak is more attenuated and of a rose-colour ; and 
I cannot perceive any vestige of the angular line which extends pos- 
teriorly from the umbo. 
Ne#ra Purtiprinensis. N. testd oblongd, albidd, subplanulatd, 
epidermide tenui striatd indutd, in rostro brevi attenuatd ; valvis 
inequalibus, dextrd minori. Long. 22; lat. 1; alt. 1S lin. 
Hab. Cagayan, island of Mindanao, and Batangas, island of Luzon, 
Philippines ; in from twenty to thirty fathoms, sandy mud. 
Cab. Cuming. 
Nezra tricona. N. testd trigond, albd, minut? sulcatd; latere 
antico retuso; rostro brevissimo, obliquo. Long. 22; lat. 1; 
alt. 12 lin. 
Hab. ? 
Cab. Cuming. 
NeE@Ra IRIDESCENS. UN, testd albidd, ventricosd, levigatd, politd ; 
valvis equalibus, margine ventrali postice emarginato ; retuse ros- 
tratd. Long. 8; lat. 4; alt. 54 lin. 
Hab. Sual, island of Luzon, Philippines; from five to seven fathoms, 
sandy mud. 
Ne#ra oparina. N, testd ovali, hyalind, levigatd, politd, subplanu- 
latd ; valvis equalibus ; rostro gradatim elongato, obtuso. Long. 
6; lat. 2; alt. 42 lin. 
Hab. Bassey, island of Samar, Philippines; from four fathoms, 
among coarse sand and mud. 
Cab. Cuming. 
In the foregoing ventricose species the anterior portion of the shell 
is considerably dominant. In this flatter species the greater bulk is 
devoted to the formation of the rostrum. 
