196 



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

 one small. — G. B, S. 



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

 inccquilaterali, altitudine longitudinem superante, gibbosd, obtuse 

 radiatim striatd, striis perjhsciculos costiformes congestis, inter- 

 stitiis striatis : long. IŠ, lat. 1 '15, alt. 1-6 poli. 

 Hab. ad Panamam et Real Liejos. 



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

 grey, and very irregularly splashed over wilh dark chestnut brovvn : 

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

 įimbones. 

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



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

 aguilaterali, altiils quam longd, suhgibbosd, radiatim sulctttd et 

 striatd, striis per fasciculos costiformes congestis, interstitiis la- 

 tiusculis, Icevibus : long. 1*3, lat. 1, alt. \' 5 poli. 

 Hab. in America Centrali et Meridionali. 



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

 at Puerto Portrero and in the Bay of Guayaquii. 



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

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

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



Pectunculus tessellatus, Pect. testd orbiculari, subglobosd, 

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

 stantibus, radiantibiis : long. 0"9, alt. 1, lat. 0'7 poli. 

 Hab. ad littora Columbias 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 strigaid et variegatd ; costis 

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

 lat. 0-65, alt. 105 poli. 

 Hab. ad Sanctara Elenam. 



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

 G. B. S. 



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

 atim sulcatd, tatere postico breviore, Jerrugineo, ventrali roseo- 

 Juscescente, antico longiore ; intus albicante, purpurascente-brun- 

 neo infectd ; long. \'^, lat. 07, alt. 1-2 poli. 

 Hab. ad littora Brasiliae. 



Two specimens only vvere brought from Riode 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 olivnced indutd ; marginibus dorsalibus iu' 

 clinaiis ; latcre antico rotuiidato-acuminato, postico subtruncafo, 



