u 



Venus ornatissima. Ven. testd suhglohulosd, raJiatim creherrimc 

 costatd, lamellis concentricis valde elevatis, crispo-plicatis,spadiceo- 

 albente ; intus albd, limbo interno crenulato : long. 1"6, lat. (la- 

 mellis inclusis) l'l, alt. 1'4 poli. 

 Hab. ad Panamam. 



This uniąue and highly omamented shell was dredged up from 

 sandy mud at a depth of ten fathoms. 



TTie regular radiating ribs, each of -vvhich, as it advances from about 

 the middle of the valve to the ventral border, has a depression in 

 the middle, and the crisply plaited weU-developed concentric frill-like 

 lamellce, render it the most curious in point of workmanship of any 

 of the species. — W. J. B. 



Venus Mactracea. Ven. testd subglohulosd, lineis concentricis, 

 elevatis, acutis, subdistantibus ornatd, albd ; limbo interno lavi : 

 long. 1*5, lat. 9, alt. 1'3 poli. 

 Hab. ad Valparaiso. 



This uniąue shell ■was dredged from sandy mud at a depth of 

 twenty fathoms. I have given it the trivial name of Mactracea be- 

 cause it reminds the spectator of soma of the lamellated species of 

 that genus. — W. J. B. 



Venus pulicaria. Ven. testd subtrigond, lineis concentricis, elevatis, 

 creberrimis, subtilissime plicatis ornatd, albd spadiceo inspersd ; 

 ared dorsali velposticd nigro-spadiceo strigatd, lunuldfuscd ; intiis 

 purpurascente, limbum versus crenulatum albente : long. 18, lat. 

 1-, alt. 1-4 poli. 

 Hab. ad Columbiam Occidentalem. (Chiriąui and Tumaco.) 

 The seattered spots are often arrangedin angular figures, and being 

 more intense in some parts than others, the valves present a some- 

 ■what radiated appearance. 



Dredged up from sandy mud at a depth of three fathoms. — 

 W. J. B. 



Venus obscura. Ven. testd subglobosd, lineis concentricis crenulatis 

 horridd, albente obscuri maculatd ; intus albd, limbo crenulato : 

 long. 0-7, lat. 0-5, lat. 0-7 poli. 



Hab. in Oceano Pacifico. (Lord Hood's Island.) 



Found in coral sand at low water. — W. J. B. 



Genus Cytherea. 



Cytherea lubrica. Cyth. testd subrotundato-cordatd, lubricd, sub- 

 violaced, intiis albd, antice et superne subconcenirice lineatd, lineis 

 elevatis; limbo interno Icevi : long. 1"7, lat. O' 8, alt. I 4 poli. 



Hab. in America Centrali. (Puerto Portrero). 



Tliis species, which is of moderate size, was dredged up by Mr. 

 Cuming from coral sand at a depth of thirteen fathoms. The con- 

 centric somewhat elevated lines are comparatively small and close at 

 the upper part of the valve near the umbones, and gradually -vviden 

 out till they become distant and strongly marked at the anterior part 

 'of the valves, the middle and posterior parts of vi^hich are ■without 

 any lineations. The whole shell has a shining slippery appearance. 

 — W. J. B. 



