TRIVIA. 201 



from the Pacific region, and retains T. globosa for the West 

 Indian form, but I have not been able to separate the two. 



T. subrostrata, var. alba, Krebs, is most likely T. globosa; the 

 two species are very similar in form. 



T. PAUCILIRATA, Sowb. PI. 21, figs 98, 99. 



Ovate, ribs coarse, dorsal impression conspicuous. 



Length, -25 inch. Hab. (?) 



** Shell usually pinkish, spotted. 

 T. PEDICULUS, Linn. PL 21, figs. 94-97. 



Fleshy white marbled with pale brown, especially towards the 

 sides, margin ridged, dorsal spots black, ribs coarse, nodular, 

 interior of colnmella white. Length, '25-'6o inch. 



Florida, West Indies. 



A species presenting considerable variation. 



T. labiosa, Gask. (fig. 97), is a variety in which the marginal 

 ridge is exaggerated ; the ribs are fewer in number and of a 

 whitish color, while in T. cimex, H. Owen (fig. 96), there is an 

 increased tendency to crenulation in the dorsal ribs, and an 

 amalgamation of the dark spots on the right side into one 

 blotch. 



Fossil, T. pediculus occurs in the Pliocene clay beds of Costa 

 Rica (W. M. Gabb). 



T. SUFFUSA, Gray. PL 21, figs. 1, 2, 100, 



blong ovate, ribs fine, promiscuously variegated and sprinkled 

 with brown, extremities pink, base whitish. Length, *3-*5 inch. 



West Indies. 



Described by Duclos, under the name T. Armandina. 



T. pullata, H. Owen (fig. 100), presents the peculiarity of the 

 spots being amalgamated into a single tint. 



T. PACIFICA, Gray. PL 21, figs. 3, 4. 



.More attenuated than the preceding, with more produced 

 extremities ; the ribs are finer and the dorsal spots alternate on 

 each side of the sulcus. Length, -3-'4 inch. 



Gulf of California (Stearns), Acapulco, Galapagos Is. 



T. QUADRIPUNCTATA, Gray. PL 22, figs. 5, 6. 



llotundly ovate, back ornamented with four conspicuous red 

 14 



