Zoological Society. 147 



chotomis, concentrice minutissime striatd, valvd liberd suhcon- 

 vexd, umbone extra apicem valvce alterius producto. 

 Hah. Cape Upstart, 8 fathoms ; Mr. Jukes. (Mus. Cuming.) 

 Myochama Strangei, a. Adams. M. testd luted, tenui, fragili, 

 corrugatd, costis nodosis, nan distinctis, concentrice striatd, 

 lineis radiantibiis asperis ad marginem ventralem distinctiori- 

 bus ; valvd liberd depressd umbone piano cinerascente non extra 

 apicem valvce alterius producto. 

 Hab. Port Jackson ; Mr. Strange. (Mus. Cuming.) 



4. Description of new species of the genus Cumingia, 



WITH some additional GENERIC CHARACTERS. 



By Arthur Adams, R.N., F.L.S. etc. 

 Cumingia, G. B. Sowerby, 



Testa bivalvis, incequilateralis, cequivalvis, latere antico rotundato, 

 postico hiante subacuminato ; dentibm, cardinali, in utrdque 

 valvd unico, parvo antico, lateralibus in alterd valvd ad utrmn- 

 que latus una, valido, in alterd nullo ; ligamento interno foveolm 

 subcochleariformi affixo ; impressionibus muscularibus duabus 

 lateralibus disfantibus, anticd irregulari oblongd, posticd sub- 

 rotundatd ; impressione musculari pallii sinu maximo. 

 All the species of this genus gape more or less posteriorly, are 

 more or less laraellose, and the cavity for the cartilage is spoon- 

 shaped and projects into the cavity of the valves, differing in this re- 

 epect from Amphidesma or Semele. 



Cumingia similis, A. Adams. C. testd subtrigonali-ovatd dc" 

 cussate striatd, lineis transversis concentricis, lamelld unicd 

 prope marginem ventralem antice latiore rotundato supra angu- 

 lato postice angustiore subrostratd, ared posticd clausd, lunuld 

 lanceolato-ovatd, margine ventrali postice coarctatd. 

 Hab. N.W. coast of America. (Mus. Cuming.) 



Cumingia Clerii, A. Adams. C. testd ovatd compressd subce- 

 quilaterali, albd, opacd, subleevi, nitidd, striis transversis con- 

 centricis alveolisque irregularibus, latere antico angustiore ro- 

 tundato, postico latiore, margine ventrali integro arcuato. 



Hab. Found at Talcuhano, Chili, by Capt. Clery, French Marine, 

 attached to fuci in shallow water. (Mus. Cum.) 



Cumingia antillarum, A. Adams. C. testd ovato-trigonali, 

 concentrice lamellosd ; lamellis suhdistantibus, interstitiis vald^ 

 longitudinaliter striatis, latere antico breviore latiore rotun- 

 dato, postico longiore, angustiore subrostrato, valde hiante, 

 margine ventrali postice subsinuato. 



Hab. West Indies. (Mus. Cuming.) 



Cumingia fragilis, A. Adams. C. testd transversd ovali albd 

 fragili subpellucidd concentric^ lamellosd ; lamellis elevatiuscu- 

 lis, subdistantibus, interstitiis tenuissime longitudinaliter stria- 

 tis, latere antico latiore margine sinuato, postico angustiore ro- 

 tundato subjlexuoso, margine ventrali integro arcuato. 



Hab. Guadaloupe; Governor Admiral Tovrbey re. (Mus. Cuming.) 



10* 



