359 



Shell suborbicular, rather attenuated and subtruncate behind, 

 rather thick and whitish ; valves unequal, with few rather large, 

 rounded, radiating ribs ; marginal Kne flexuous, slightly sinuated 

 in front; perforation large, nearly entire; cardinal area large, 

 flattish, with an undulated margin ; deltidia large, separate ; pos- 

 terior margin of the ventral valve inclined on either side ; internal 

 appendage consisting of a single strong spine standing forward and 

 with two lateral reflected branches ; margin of the valves crenated. 



From Santa Cruz ; in Mr. Cuming's Collection. 



32. Teeebratula globosa (pi. Ixxi.f. 99-101.) Lam. 



Testa ovata, ventricosa, glaberrima, albicante ; valvis subfequali- 

 bus, antice subtrilobis ; linea marginali recta, antice subsinuata ; 

 valva dorsali postice subacuminata, vertice subreflexo, truncato; 

 foramine magno, obliquo, fere integro ; area cardinali majuscula, 

 lateribus rotundatis ; deltidiis majusculis, trigonahbus, discretis ; 

 carina dorsah lata, rotundata, subinconspicua -, valva ventrali ro- 

 tundata, antice sublobata ; ossiculo interno magno, -f longitudinis 

 testae, ut in T, Californicd, margine valvarum integro. 



Shell ovate, ventricose, very smooth, wliitish; valves nearly 

 equal, very slightly trilobed in front, marginal line straight, 

 sinuated in front; dorsal valve slightly acuminated behind, 

 its vertex subreflected and truncated ; perforation large, obhque, 

 nearly complete ; cardinal area large, rounded on the sides, 

 deltidia large, triangular, separate ; mesial ridge broad, rounded, 

 not very distinct ; ventral valve rounded, slightly lobed in front ; 

 internal appendage large, |ds the length of the valve and formed 

 as in T. Calif ornica ; margin of the valves entire. 



I have only seen a single specimen of tliis species, which is in 

 Mr. Cuming's Collection without locality : it agrees perfectly with 

 the representation in the Enc. Meth. t. 239. f. 2. stiU the foramen 

 is not quite complete, although Lamarck gives " foramine integro " 

 as one of its characters. 



33. Terebeatula iNCONSPicuA (pLlxxi. f. 102-104.) noMs. 



Testa rotundato-subtrigonali, postice acuminato-rotundata, an- 

 tice subsinuata, obscure rufa ; valvis insequalibus, glabris ; linea 

 marginali flexuosa; valva dorsali rotundato-subtrigona, foramine 

 maximo, incompleto ; area cardinaH lata, ad utrumque latus decHvi; 

 deltidiis mediocribus, late discretis ; valva ventrali transversim ob- 

 longa, subplanulata, sulco mediauo lato, subinconspicuo ; margine 

 valvarum integro. 



2f2 



