426 MESSRS. A. ADAMS AND G. FRENCH ANGAS [NoV. 10, 



5. Semele crenata. Ad. & Ang. 



5. testa transversim ovata, suhdistorta, gihha, sordide alba, con- 

 centrice lamellosa, marginibus lamellarum ina-assatis et ere- 

 natis, interstitiis cancellatis, latere antico rotmidato, postico 

 subsinnato, margine ventrali flexuoso. 



Alt. 7 lines, lat. 9 lines. 



Hab. Moreton Bay {Coll. Angas.). 



A species most resembling in form S. rupium, Sow., but with the 

 edges of the concentric lamellae thickened and very beautifully cre- 

 nate. 



6. Semele ada. Ad. & Ang. 



S. testa transversim ovata, subceqidlaterali, compressa, umbonibus 

 aciitis, area cardinali antica excavata, latere antico rohmdato, 

 postico obtuse angulato ; albida, epidermide fusca fugacea tenui 

 obtecta, concentrice rugoso-plicala, margine ventrali arcuato. 



Alt. A\ lines, lat. 6 lines. 



Hab. Port Adelaide Creek, 3 fathoms {Coll. Angas.). 



A small compressed plicate species, with the anterior hinge-area 

 excavated. 



7. Ltjcina concentrica. Ad. & Ang. (PI. XXXVII. fig. 19.) 



L. testa orbiculari, subcequilaterali, gibbosa, solida, alba, concen- 

 trice lamellosa; lamellis costiformibus, vix elatis, wqualibtis, 

 subdistantibus, interstitiis obsolete radiatim liratis ; lunula 

 parva, angusta ; margine ventrali crenulato. 

 Alt. 11 lines, lat. 11 lines. 



Hab. St. Vincent's Gulf, South Australia {Coll. Angas.). 

 This species appears to combine the characters of Cyclas of Klein 

 and Lucina proper, having the equilateral orbicular shape of the 

 former and the concentric sculpture of the latter. It is a solid, white, 

 gibbous species, with the edges of the valves finely crenate. 



/ZM 8. Lucina (Cyclas) ctjmingi. Ad. & Ang. (PL XXXVII. 



'^ fig. 20.) 



L. testa orbiculari, cequilaterali, solida, gibbosa, alba, lateribus 

 subdilatatis ; superficie valvarum divaricatim valde insculpta ; 

 liris divaricatis, acutis, imbricatis, subdistantibus, antice ab- 

 rupte desinentibus ; margine ventrali integro. 

 Alt. l^inch, lat. 1 inch 7 hnes. 



Hab. St. Vincent's Gulf, South Australia {Coll. Angas.). 

 A large, handsome species, with traces of a thin light-brown epi- 

 dermis on the lateral margins of the valves. The divaricating ridges 

 are acute and imbricate upwards, and are wider apart than in most 

 other species of this group, which has been named Cyclas by Klein. 

 The Cyclas of Lamarck is the Sphcerium of Scopoli. 



9. Crassatella aurora. Ad. & Ang. (PI. XXXVII. fig. 15.) 

 C. testa transversim ovata, compressa, subcequilaterali, utrinque 



