94 MAZATLAN BIVALVES 



128. CAEDIUM , sp. ind. (I.) 



Tablet 456 contains a fragment; of a shell of moderate size, 

 which may possibly be C. triangulatum, Sow. (St. Elena and 

 Isle Plata, Owning.) It has very broad flat ribs, with 2 rows 

 of tubercles on each. These communicate with decussating 

 lines in the interstices. 

 Hob. Mazatlan ; from shell washings ; Lpool Col. 



129. CAEDIUM sp. ind. (c.) 



Tablet 457 contains a fragment of a moderate sized Cardium, 

 having relationship with C. pseudofossile, Rve. (Hearing's Sir.) 

 It is of a dead white, with very close, stout, numerous, rounded 

 ribs, barely nodulous. 

 Hab. Mazatlan ; from shell washings ; L'pool Col. 



130. CAEDIUM sp. ind. (d.) 



Tablet 458 contains a fragment of a thin white shell with 

 perfectly triangular, rather distant ribs, with flat sides. The 

 interstices are smooth, bounded by clearly marked lines. 

 Hab. Mazatlan : from shell washings ; L'pool. Col. 



131. CAEDIUM , sp. ind. (e.) 



Tablet 459 contains 2 fragments, something like the last, but 

 coloured, and with the ribs rounded and slightly nodulous. 

 Sab. Mazatlan ; from shell washings ; L'pool Col. 



132. CAEDIUM sp. ind. (f.) 



Tablet 460 contains 2 minute fragments, with very narrow 

 smooth rounded ribs, very far apart. Interstices broad, smooth, 

 bounded by distinct lines. 

 Hal. Mazatlan ; from shell washings ; L'pool Col. 



133. CAEDIUM ALABASTEUM, n. s, 



C. t. parvd, alba, nitidd, subdiapkand, subcequilaterali, 

 elongatd ; costis circiter xviii., quorum quatuor v entrales 

 mag nee, distantes, costellis utraque subtrigonu- 

 lalis apicem versus granulatis ; interstitiis minutissime decus* 



