84 AMERICAN JOURNAL 



whorl furnished with five prominent varices, which are deeply 

 and openly pitted on the sides and squamose; interstices smooth; 

 aperture oval ; columella slightly arched and smooth ; outer lip 

 regularly arched, broadly varicose ; varix radiately ribbed, ribs 

 canaliculate, interstices beautifully foliated ; edge acute, crenulate, 

 smooth within; canal very short, recurved, nearly closed. White, 

 interstices between the varices suffused with pale flesh color ; 

 last whorl just beneath its middle, and spire at the suture, 

 encircled by a narrow black band. 



Remarks. — All the specimens of the above received were 

 very much encrusted, with the exception of the one figured. 



The species nearest allied is M. alveatus, Kien. 



Omphalius turbinatus, Pease. Plate viii, fig. 15. 



T. subdepresso-turbinata, crassa, late et profunde umbilicata ; 

 anfr. supra angulatis, ultimo ad peripheriam obsolete angulato, 

 liris paribus nodulosis cingulatis, basi convexa, laevis aut obsolete 

 lirata, regione umbilical! Igevis ; columella ad basim nodoso 

 dentata, dente parvo, vix elevata terminata (non sulcata). 

 Flavescente aut albida, radiatim lineis rufescente-fuscis notata, 

 lineis obliquis et interruptis, base rufescente-fusca maculata, 

 umbilicus, columellaque viridis. 



Alt. 18. Diam. 13 mill. 



llab. — La Paz, in sinu Californico. 



Shell somewhat depressly turbinate, thick, solid, openly and 

 deeply umbilicate ; whorls angulate above, the last obsoletely 

 angulate at periphery, encircled by small slightly nodulous 

 ridges, interstices elevately striate, base convex ; smooth or 

 obsoletely ridged, at the umbilical region smooth ; columella at 

 base nodosely dentate, and terminating in a very slightly 

 elevated tooth (not grooved). Yellowish or whitish, radiately 

 obliquely marked with fine reddish brown interrupted lines, base 

 spotted with reddish brown, umbilicus and columella sea green, 

 operculum bright yellow. 



The young is more depressed, more sharply angulate, and very 

 finely and closely striate concentrically, and also of a darker 

 color. 



Remarks. — The species nearest allied to the above, so far as 

 I am aware, is 0. coronulata, C. B. Ad. It may also be com- 

 pared with 0. Ugulatus, Mke. It may be readily distinguished 

 from either of those species by the shape of its base, the colu- 

 mella tooth projecting much more and no trace of a groove. The 

 umbilicus is also more open, smooth around its outer edge, and 

 colored green as well as the columella. Its sculpture is also 

 much ligrhter. 



