VENUS.— Plate XII. 



Species 42. (Mus. Cuming.) 



Venus ckassicostata. Ven. testa subquadrato-ovatci, 

 calcareo-albd, ferrugineo tinctd, radiatim costatd, 

 costis siihplanatis, irmgularibus, confortis, costis an- 

 licis uodoso-creiiatiis, posticis rude corrugalin. 



The thick-ribbed Venus. Shell somewhat squarely 

 ovate, chalk-white, tinged with rust, radiately 

 ribbed, ribs rather flattened, irregular, close-set, 



anterior ribs nodosely crenated, posterior rudely 



wrinkled. 

 QuoY and Gaimard, Voy. de FAstrolabe, Moll. pi. 84. 



f. 1, 2. 



Tapes crassicosiata, Sowerby. 

 Hub. Otago, New Zealand. 



An opake rust-tinged chalk-white shell, having a semi- 

 fossil appearance. 



