ASTARTE.— Plate II. 



pressed, finely wrinkled towards the umboes; 

 anterior side rather short, with dorsal margin 

 excavated near the umboes ; posterior side pro- 

 duced, truncated at the end, with dorsal margin 

 rather straight. 



Leach (Crassina). Ann. Phil. 1-4, fig. 204. 



Hah. North Seas. 



Species 13. (Mus. Brit.) 



AsTARTE INTERMEDIA. Ast. testd ovato-suUi-igona, 

 iitrinquc suhacuininatA ; rugis numerosis, rotundis, 

 prope marginem posticum suhevanidis ; unibonibus 

 elevatis, margine dorsali utrinque declivibus ; 

 inargine interno Icevi. 



The INTERMEDIATE AsTARTE. Shell ovate-subtrigoual, 

 rather acuminated at each end; wrinkles numerous, 

 rounded, partly disappearing near the posterior 

 margin ; umboes elevated, dorsal margin sloped at 

 each side ; inner edge smooth. 



SowERi'.v. Tiiesaurus Conchyliorum, Astarte, Sp. 3. 



Ilab. North Europe. 



Resembling Astarte undata in form, but more 

 pointed, and having many more ribs than A. sulcata; 

 almost as many as Astarte crtbricostata. 



Species 14. (]Mus. Brit.) 



Astarte Mortoni. Ast. testd ovato-suborhiculari, com- 

 ]}ressd; rugis concentricis distantibus, validis, 

 versus margines utrinque discontinuis ; mterstitiis 

 latis, profunde excaratis ; unibonibus obtusis ; latere 

 antico brevi, rotunda ; latere postico ptroducto, 

 obscure truncato; margine venlrali rotundatim con- 

 vexo ; margine interno IcBvigata. 



Morton's Astarte. Shell ovate-suborbicular, com- 

 pressed ; concentric wrinkles distant, strong, dis- 

 continued near the margin on each side ; inter- 

 stices broad, deeply excavated ; uml)oes obtuse ; 

 anterior side short, rounded ; posterior side pro- 

 duced, obscurely truncated ; ventral margin 



roundly convc 



irgin smooth. 



Sowerby in Thesaurus. 



Adams ? 



Astarte undata, var. 

 Hab. North America. 



My only authority for this species is a specimen 

 named as above in the Cumingian collection; not the 

 undeveloped shell quoted in the Thesaurus, but a 

 mature shell of rounded form and dark black epidermis. 



Species 15. (Mus. Sowerby.) 



Astarte semilirata. Ast. testd ovato-subti-igond, 

 elevatd, medio oblique tumidd ; latere antico oblique 

 producto, infra umbones excavato ; umbonibvs re- 

 trorsis, prominentibus, acuminatis ; latere postico 

 declivi, obscurissime truncato, margine ventrali 

 acclivi ; rugis concentricis versils umbones nmnerosis, 

 concinnis, acutis, medio et infra evanidis. 



The half-ridoed Astarte. Shell ovate-subtrigonal, 

 elevated, obliquely timiid in the middle ; anterior 

 side obliquely produced, excavated under the 

 umboes ; umboes leaning backwards, prominent, 

 acuminated ; posterior side sloped, very obscurely 

 truncated, ventral margin sloped upwards ; con- 

 centric ridges near the umboes numerous, neat, 

 sharp, becoming obscure at the middle and below. 



Sowerby. 



Hab. Northern Seas. 



Species IG. (Mus. Brit.) 



Astarte triangularis. Ast. testd parvd, altd, oblique 

 trigona, tumidd, politd ; urnbonibus prominentibus, 

 fere terminalibus ; latere antico fere perpendiculari ; 

 latere postico declivi, ad marginem ventraleni pro- 

 ducto ; margine interno crenulato. 



TiiE TRIANGULAR AsTARTE. Shell Small, elevated, 

 obliquely trigonal, tumid, polished ; umboes pro- 

 minent, nearly terminal ; anterior side almost per- 

 pendicular ; posterior side sloped, produced at 

 the ventral margin ; inner margin creuulated. 



Montagu (Mactra). Test. Brit., p. 99, pi. 3, f. 5. 



GoodaUia triangularis, Turt. 



Hab. North Britain. 



