fl%*9*i 



196 



are more prominent than others in the proportion of two large to 

 one small. — G. B. S. 



Pectunculus in^qualis. Pect. testd subcordiformi, obliqud, 

 incequilaterali, altitudine longitudinem superante, gibbosd, obtuse 

 radiatim striatd, striis perjasciculos costiformes congestis, inter- 

 stitiis striatis : long. 15, lat. 1 15, alt. IS poll. 

 Bab. ad Panamam et Real Llejos. 



A very beautiful species, of a white colour, varied with blueish 

 grey, and very irregularly splashed over with dark chestnut brown : 

 the ligament is short, and a very small part of it is anterior to the 

 umbones. 

 Found in sandy mud in ten fathoms. — G. B. S. 



Pectunculus assimilis. Pect. testd subcordiformi, obliqud, in- 

 cequilaterali, altiiis quam longd, subgibbosd, radiatim sulcatd et 

 striatd, striis per fasciculos costiformes congestis, interstitiis la- 

 tiusculis, Iccvibus : long. 1*3, lat. 1, alt. 1*5 poll. 

 Hab. in America Centrali et Meridionali. 



Dredged in sandy mud and gravel, in from eight to twelve fathoms, 

 at Puerto Portrero and in the Bay of Guayaquil. 



It is a beautiful species, varying much in colour: in general the 

 ground colour is white, and it is splashed over with greyish brown, 

 rust-colour, and chestnut brown. — G. B. S. 



Pectunculus tessellatus. Pect. testd orbicularis subglobosd, 

 albd, castaneo tessellatd et variegatd; costis rotundatis, subdi- 

 stantibus, radiantibus: long. 0*9, alt. 1, lat. 0*7 poll. 

 Hab. ad littora Columbia? Occidentalis. 



From sandy mud and gravel, in from eight to ten fathoms, at 

 Monte Christe and in the Bay of Xipixapi. — G. B. S. 



Pectunculus strigilatus. Pect. testd orbiculari, subventri- 

 cosd, albidd, roseo tinctd et rubiginoso strigatd et variegatd ; costis 

 rotundatis, di&tantibus, radiantibus, interstitiis Icevibus ; long. 1, 

 lat. 0-65, alt. 105 poll. 

 Hab. ad Sanctam Elenam. 



Dredged from a depth of six to eight fathoms in sandy mud.— 

 G. B. S. 



Pectunculus longior. Pect. testd ellipticd, albicante, radi- 

 atim sulcatd, latere postico breviore, ferrugineo, ventrali roseo- 

 Jiiscescente, antico longiore ; intits albicante, purpurascente-brun- 

 neo infectd ; long. 1*4<, lat. 0"7, alt. 1*2 poll. 

 Hab. ad littora Brasilia?. 



Two specimens only were brought from Rio de Janeiro. 

 This species is remarkable for being proportionally longer than 

 others. — G. B. S. 



Genus Capsa. 

 Capsa altior. Capsa testd oblongo-subtrigond, pallescente, intus 

 violaced, epidermide olivaced indutd ; marginibus dorsalibus hi' 

 clinatis ; latere antico rotundato-acuminato, postico subtruncato, 



