359 



Shell suborbicular, rather attenuated and subtruncate behind, 

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

 rounded, radiating ribs ; marginal Hue flexuous, sHghtly sinuated 

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

 flatfish, 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. Terebratula globosa (pi. lxxi. f. 99-101.) Lam. 



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

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

 valva, dorsab postice subacuminata, vertice subreflexo, truncato ; 

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

 lateribus rotundatis ; deltidiis majusculis, trigonalibus, discretis ; 

 carina dorsali lata, rotundata, subinconspicua, ; valva, ventrali ro- 

 tundata, antice sublobata ; ossiculo interno magno, f longitudiuis 

 testse, ut in T. Califomicd, margine valvarum integro. 



Shell ovate, ventricose, very smooth, whitish ; 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, oblique, 

 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. Califomica ; margin of the valves entire. 



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

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

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

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

 as one of its characters. 



33. Tekebbatula inconspicua (pi. Lxxi. f. 102-104.) nobis. 



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

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

 marginali flexuosa ; valva, dorsali rotundato-subtrigona, foramine 

 maxim o, incompleto ; area cardinali lata, ad utrumque latus declivi; 

 deltidiis mediocribus, late discretis ; valva, ventrali transversim ob- 

 longa, subplanulata, sulco mediaUo lato, subinconspicuo ; margine 

 valvarum integro. 



