248 LEPTOTHYRA. 



upon the base are but little, if at all, uarrower than the upper ones ; 

 whilst iu L. sanguineus and X. sangarensis the difference in width is 

 decided and constant. I have seen specimens of L. carpenteri 

 strongly lirate both above and below. As to color, "the species is 

 of all shades of crimson and purple, some specimens being banded 

 with white, or having the red color of the ribs interrupted by ob- 

 lique streaks of white ; some specimens, excepting the dark apex, 

 being pure white." (Dall.) 



I did not adopt the varietal name pHrjnireus, proposed by Car- 

 penter, because it has already been twice used in this genus. 



L. PAucicosTATA Dall, 1871. PI. 63, fig. 27. 



Shell small, depressed-globose, solid, imjjerforate ; whorls 4, rap- 

 idly increasing, very strongly spirally lirate, the lirse seven to eight 

 in number on the last whorl, separated by deep grooves, iu which 

 incremental strife are evident ; sutui*es canaliculate ; aperture con- 

 tracted, pearly white within ; columella ending in a callous tubercle; 

 color rusty brown or rose-red, frequently with alternating white 

 spots on the ribs, interstices generally lighter, sometimes })ui'e white. 



Alt. 4, diam. 4 mill. 



Monterey, Catalina Id. and San Diego, Cal. 



Most nearly allied to the preceding, but differing sufficiently in 

 the extremely coarse prominent ribs. 



L. BACULA Carpenter, 1865. PI. 39«, fig. 33. 



Shell small, depressed-globose, solid, imperforate, rufous ashy ; 

 whorls 4, slightly convex, rapidly increasing, obsoletely but regu- 

 larly spirally striate ; aperture large, oblique, deflexed above. 



Alt. 4, diam. 5 mill. 



CoUoiiia paucicostata Sowb. (not Dall) is a synonym. 



Allied to L. carpenteri, but readily separated by the nearly obso- 

 lete spiral sculpture. 

 L. MAEGiNATA ("Nuttall") Rceve, 1848. PI. 58, figs. 51, 52. 



" Shell ovate, rather solid, imperforated, spirally striated, slightly 



grooved ; aperture small ; whitish stained and blotched with livid 



olive." {Reeve.) 



Upper California. 



I have copied Reeve's description aud the figures of Reeve and of 



Sowerby — the latter said to be twice the natural size. If this shell 



ever came from California, which is very improbable, it might be a 



form of L. hacula Cpr. It is not the T. maginatus Nuttall mss., 



which is a species of Trochidce. 



