40 LAMPAS. 



intermediate stages which prove their identity. A large cruen- 

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

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



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



Shell smaller; aperture roseate within; columella white. This 

 variety inhabits several West Indian localities, and these were 

 named R. Thomae by d'Orbigny (fig. 36). but they do not differ 

 at all from Philippine and Mauritian specimens. 



R. CALIFORNICA, Hinds. PL 22, fig. 42 ; PL 21, fig. 32. 



White, variegated and interruptedly banded with chestnut ; fine 

 specimens are roseate within the aperture. 



Length, 2-5 to 4 inches, 



California, Lower California. 



P. P. Carpenter considered this species identical with R, ven- 

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

 common ancestry ; ventricosa, however, is much thinner (very 

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

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

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

 of California, R. Thersites, Redfield (fig. 32), is a synonym. 



R. VENTRICOSA, Brod. PL 20, figs. 16-18. 



White, when fresh, mottled and banded with chestnut, ; aper- 

 ture white within. Shell very thin for the genus. 



Length, 2 to 3 inches. 



Callao, Peru. 



D'Orbigny dredged this species in 8 to 10 metres' depth, rocky 

 situation with strong current. The eggs are deposited in crowded 

 groups upon Macrocystis; they are yellowish or reddish in 

 color. 



R. SCROBICULATOR, Linn. PL 20, figs. 19, 20. 



Mottled yellowish brown and white, with faint darker bands. 

 Surface thickly covered with papillary tubercles. 



Length, 2 to 3-5 inches. 



Mediterranean Sea. 



Described as a Triton and still referred to that genus by sev- 

 eral distinguished conchologists. Like R. lampas it has the var- 

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



