44 



Venus ouNATissiMA. Ven. testd suhglobulosd, raJtalim creberrinic 

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

 albente ; intus albd, limbo interna cremdato : long. 1"6, lot. [la- 

 mellis inclusis) I'l, alt. 1'4 poll. 

 Hab, ad Panamam. 



This unique and highly ornamented shell was dredged up from 

 sandy mud at a depth of ten fathoms. 



The regular radiating ribs, each of which, 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 

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

 of the species. — W. J. B. 



Venus Macteacea. Ven. testd subglobulosd, lineis concentricis, 

 elevatis, acutis, subdisiantibus ornatd, albd ; limbo interna Icevi : 

 long. r5, lat. 09, alt. IS poll. 

 Hab. ad Valparaiso. 



This unique 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 some of the lamellated species of 

 that genus. — W. J. B. 



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

 creberrimis, stcbtilissitne plicatis ornatd, albd spadicea inspersd ; 

 area dorsalivelposticdnigro-spadiceo strigatd, lunuld fused ; intiis 

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

 V, alt. 14 poll. 

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

 The scattered spots are often arranged in 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 subglobasd, lineis concentricis crenulatis 

 harridd, albente obscuri maculatd ; intiis albd, limbo crenulato : 

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



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



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



Genus Cytherea. 



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

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

 elevatis ; limbo interna lavi : long. 1'7, lat. 0'8, alt. 14 poll. 



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 widen 

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

 'of the valves, the middle and posterior parts of which are without 

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

 — W. J. B. 



