697 



63. Tapes crassicosta (pi. cxlix. f. 93), Q,mi) (Venus), 

 Voy. Ast. MoU. pi. 84. f. 1, 2. V. costata, Qrmj? 



T. testa ovali-subquadrata, crassa, alba, intus postice violacea, 

 planulatim late radiatim costata, costis posticis elevatis subrugo- 

 sis, antice costellis reflexis subundulatis decussatis ; margine in- 

 tus minute crenulato. 



Of a rhomboidal form, rather deep, thick, and rounded ; with 

 broad radiating ribs, which are raised at the posterior part of the 

 shell and intersected at the front by undulating concentric ribs, 

 which do not quite reach to the middle. 



Otago, New Zealand. 



64. Tapes tumida (pi. cxlvi. f. 43), Soioerhy,jun. 



T. testa subrotundata, ventricosa, crassa, pallida, postice rufo 

 sparsim maculata, radiatim costata, costelhs numerosis, anticis 

 duphcatis, antice concentrice leviter striata; umbonibus tumidis; 

 margine veutraH intiis minute denticulato, 



A tumid, nearly white shell, with small radiating ribs, which, 

 in the front part of the shell, are duplicate, and crossed by faint 

 concentric striae. 



Columbia. In Mr. Hanley's collection. 



65. 



Tapes diversa (pi. cxlvi. f. 41), Sowerhy,jun. 



T. testa crassa, cretacea, rhomboidea, ventricosa, antice rotun- 

 data, postice truncata, radiatim costata ; costellis postice et medio 

 inaequahbus, subserratis, acutis, antice costellis concentricis un- 

 dulatis decussatis ; lunula linea impressa circumscripta ; margine 

 dorsali dechvi ; margine ventrali denticulato ; ligamento magno. 



Large, chalky-white, truncated at the back, rounded in front, 

 with radiating ribs, which at the back and middle of the shell 

 are sharp, unequal, and denticulated; in front are crossed by 

 rather distant concentric undulating ridges. The ligament is 

 large ; the ventral margin crenulated witliin. 



Monterey, California. Mr. Hartweg. 



66. Tapes tessellata (pi. cli. f. 142, 143), A. Adams 

 (Venus), Voy. Samarang, p. 79. pi. 22. f. 11. 



T. ''testa oblongo-ovata, antice truncata, crassiuscula, fusco 

 alboque strigata et tessellata, radiatim multilirata, transversim 

 tenuissime striata; lunula lanceolata, ovatu." 



The specimen of tliis shell in Mr. Cuming's collection is of a 



