40 LAMPAS. 



intermediate stages which prove their identity. A large cruen- 

 lata, with the tubercles dark, and the shell in a fresh state has 

 been called R. rugosa by Mr. Sowerby (fig. 31). 



Var. RHODOSTOMA, Beck. PI. 21, tig. 25. 



Shell smaller; aperture roseate within; columella wliite. This 

 variety inhabits several West Indian localities, and these were 

 named B. Thomae by d'Orbigny (tig. 3()), but they do not dift'er 

 at all from Philippine and Mauritian specimens. 



K. Californica, Hinds. PI. 22, fig. 42 ; PI. 21, fig. 32. 



White, variegated and interruptedly banded with chestnut; fine 

 specimens are roseate witiiin the aperture. 



Length, 2-5 to 4 inches. 



California, Lower Galifornia. 



P. P. Carj)enter considered this species identical with R. ven- 

 triroiia^ Brod., and they are certainly so similar as to indicate a 

 conmion ancestry; venlricom, however, is much thinner (re;-^ 

 thin for a RaneUd ), more ventricose, spire shorter, surface 

 smoother, nodules less developed and more numerous ; R. Col- 

 iforinva is found in the pliocene and post-pliocene formations, 

 of California. 7?. T/iersifen, Redfield (fig. 32), is a synonym. 



R. VENTRicosA, Brod. PI. 20, tigs. 16-18. 



White, Avhen fresh, mottled and banded with chestnut ; ai)er- 

 ture white within. Shell very thin for the genus. 



Ijcngtli. 2 to 3 inches. 



Callao, Peril. 



D'Orbigny dredged tiiis species in .S to 10 metres' depth, rocky 

 situation with strong current. The eggs are deposited in crowded 

 groups upon Macroci/sfifi; they are yelloAvish or reddish in 

 color. 



R. scRoiJicuLATOR, Linn. PI. 20, figs. 19. 20. 



Mottled yellowish brown nnd white, with faint darkei' bands. 

 Surface thickly covered with ))apill:ivy luhcicles. 



Length, 2 to 3'.t inches. 



Mediterranean Sea. 



Described as a Triinn and still referred to tiiat genus by sev- 

 eral distinguished conchologists. Like R. lanipas it lias the var- 

 ices of a Triton, but otherwise the facies of a Ranella., and I think 



