ODOSTOMIA. 359 



0. VALLATA, 0. TENUIS, 0. SUBSULCATA, 0. MAMILLATA, 0. LAM- 



ELLATA, of Carpenter. Mazatlan. 



0. AVELLANA, Carp. Vancouver Id. 



Section EVALEA, A. Ad., 1860. 



0. TENUISCULPTA, Carp. PI. 78, fig. 49. 



Whitish, thin, diaphanous ; whorls 3, besides the nucleus, 

 with impressed suture, with rather wide spiral sulcations, three 

 on the upper whorls and upper part of body-whorl, six subobso- 

 lete on the lower part of body-whorl; tooth acute, small. 



Length, 2'5 mill. 



Neeah Bay. 



Unfigured Species. 



0. ^EQUISCULPTA and 0. DELICATULA, Carp. Cape St. Lucas, L.Cal. 

 0. SUBLTRULATA, Carp. Mazatlan. 



Section PYRGULINA, A. Ad., 1863. 



Un figured Species. 



P. ZIZIPHINA, P. PHOTIS, P. CONVEXA, P. LACUNATA, P. ARMATA 

 and P. SCALARIFORMIS, Carp. Mazatlan. 



P. NOTABILIS (Syns. P. turrita, C. B. Ad., P. quinqiiecincta, 

 Carp.), and P. TEREBELLUM (Syn. P. exarata, Carp.), of C. 

 B. Adams. Panama and Mazatlan. 



P. CLATHRATULA, C. B. Ad. Panama. 



IV. Polynesian Species. 



0. INTERSTRIATA, Souverbie. PI. 78, figs. 51, 50. 



Thin, subpellucid, somewhat glossy, cinereous ; whorls 7, longi- 

 tudinally ribbed, the interstices with close spiral striae; columella 

 with a stout fold. Length, 4 mill. 



New Caledonia, Samoa and Viti Is. 



The last two localities are for 0. densecostata, Garrett (fig. 

 50), which that gentleman, in a letter to me, acknowledges to be 

 a synonym. 



