470 MAZA-TLAIf UNIVALVES 



the acuminate growth, continuity and delicacy of the zigzag 

 pattern, and fineness of the labial teeth. In one specimen the 

 labrum is finely corrugated within. Long. 'T2, long. spir. "3, 

 lat. '3, dlv. 45°. 



Mab. — Mazatlan ; 3 dead sp. only ; Z'pool Col. 



Tablet 2185 contains a sp. tenanted by hermit crab. 



598. Olivella Ppetiolita, var. ArEEocixcTA. 



? = 01iva petiolita. Dud. in Chen. III. Condi, p. 5, pi. 1, f. 21, 22. 



Comp. O. mutica, Sa/y, in Bve. Conch. Ic. pi. 29, f. 93, a, b. (Noa 

 O. mutica, Dud. in Chen. p. 6, pi. 2, f. 5, 6 : var. f. 7, 8 :— 

 = Dactylidea mutica, H. Sf A. Ad. Gen. i. 146.) 



O. t. "O. mutiecB, Sayii," simili, sed majore, spird acutiore ; 

 infra suturam zond extus aured et intus purpurea dnctd ; lineis 

 fusco-purpureis varie angulata, rarius undulatd ; caUositate 

 basali intensiore, magis dedivi ; plids columellcB subobsoletis. 



As it is doubtful whether this shell be either the true 

 O. petiolita or the true O. mutica, a name and diagnosis are 

 added which may rank either as a variety or a species, accord- 

 ing to further light. On comparing the Mazatlan shells with 

 genuine W. Indian specimens from Dr. Cutting in the Bristol 

 Museum, there scarcely appear grounds of specific separation ; 

 the most evident being the infrasutural golden baud, the basal 

 fold rather more slanting, and the plaits fainter than in most, 

 but not all of the Caribbajan shells. Long. '37, long. spir. '16, 

 lat. -16, fZ/«. 50». 



Sab. — (O. petiolita.) Mexico [?ubi], Duclos. — (O. mutica) 

 Barbadoes, Dr. Cutting. — (O. aureocincta) Mazatlan ; very 



rave ; L'pool Col. 



Tablet '2186 contains 8 sp. exhibiting the principal varieties 

 of pattern. 



599. Olivella inconspictta, C. B. Ad. 



Oliva iuconspicua, C. B. Ad. Pan. Shells, pp. 50, 304, no. 34. 

 Comp. O. oryza, Lam. An. s. Vert. vol. x. p. 631, no. 62. 



This species was described by Prof. Adams from dead, 

 immature specimens, apparently for geographical reasons. On 

 comparing the only fresh adult foxmd with O. oryza and its 



