152 



3. Mactra Adansomi Ph. 



M. tesla ovato-ti'Tngulari, aliquantulum inaequilatera, 

 opaca, fulva, siibradiata, ad apices a(ro-violacea; extremi- 

 tale postica aatte angulaia ; liinula plana areaqiie cari- 

 nata exquisite et grosse sulcatis; dentibus cardinis elon- 

 gatis, laevihus, laminaribus. Long. 18'"; alt. 14"'; cras. 9'". 



Patria: Guinea aut Senegal. 



Differt a M. Lisor Hanley testa opaca, postice acute 

 angulata, area carinala, apicibus approximatis. 



4. Mactra Largillierti Ph. 



M. testa ovato-tri;mgulari, subaequilatera, tumida, 

 postice hiante, sub epiderniide nitente, olivaceo-Ilava ra- 

 diis angustis violaceis picta ; area lunulaque planiusculis 

 exquisite striatis; ligamento externe valde conspicuo, la- 

 mina ab interno diviso; dentibus cardinalis lateralibus 

 elongatis, laevibus; pagina interna pallide violacea. Long. 

 34'"; alt. 26'"; crass. IS'A"'. 



Patria : Gabon in Guinea , comm. cl. Largilliert. 



6, Mactra pulla Ph. 



M. testa parvula, ovato-tri;ingulari, subaequilatera, 

 plerumque fulva, albido radiata, apicibus violaccscentibus; 

 lunula areaque carinatis, exquisite striatis, Iricoloribus, 

 sub apicibus sc. luscis, dein albis, versus extremitates 

 rufo-fulvis; dentibus cardinalibus elongatis, lamellaribus, 

 haud striatis. Long. OVi'"; alt. 7"; crass. 4V2'"- 



Patria: Gabon in Guinea. Comm. cl. Largilliert. 



6. Mactra rostrata Ph. 



M. testa parva, triangula, solida, tumida, lactea, laevi, 

 extremitate postica paullo longiore, subrostrata; carina ab 



