o52 WKST AMKKICAN MiH.LlSKS STEARNS. 



aii'iKitiHl. with two 80iiu'wli;it t'loii^atiMl iul)t'rcU\s lu-ar tlu' base, ami 

 a shallow umbilical pit :ibt)Vo; bait' t-ouvcx. 



Altitiul(> o<>; diaimtm", maximum. 'M milliiiu'tcrs. 



H.viU'i'AT. — Guadalupe Islaud. '-amouu the loiks." ('apt. (iiM)i\i;e 1>. 

 Pi)rtor. This islaud is otV the outor t'oast of liowor California, iu lati- 

 tude -0-^ uoith and lougitude 118^^ west; it belou^us to ^Nlexieo. (Mus. 

 No. IlVkU:).) 



The ritljies are not of eipial thiekiu'ss, but vary eonsiderably ; iu souu' 

 instances iwiee as thick ov w ide as in others; and both ribs and «;rooves 

 are somewhat coarser on th > base than elsew her(>. The exam]>le before 

 n»e varii'S from the ordinary aspect or typical Wniu ot" I'orbes's galliiui, 

 by the nhscner thfomihout of tinij trace of " (oiKjitudiiml iiittrkintis or 

 scitlpturt" And tVoiu llemphiirs var. timid in the (thscinr{)l' the "streak 

 of yellow on tlu^ base, just below the columellar teeth:" in the latter 

 also "the lonuiludiual markinii\s and sculpture are obsolete, ami the 

 spiral ji'rooves oeuerally scarcely visible above." while iu the example 

 herein described the entirt* surface is con.'ipicuoiish/ rihhal <in<( (jroorcd 

 throiKjhoKt. 



The exeeedinu variability exhibited by fjaJliiiti and the related forms 

 o[' this jicuus on the west coast is such that I do net feel warranted in 

 reuardinii" this tine and strongly charai'teri/.ed shell as a new species; 

 it can, however, with propriety, be assigned, and is well entitled to 

 an easily recognized variet;il position. 



KXl'bANATlON OF PLATE L. 



Note. — Tho li<;inTS loUowiug tho authority for thr sjxM'itir n;imo doiioto tl.o actual 

 size iu luilliiuottM-s of tlio spooiuion figured. 



Kij;-. I. OiichitUUa Binneni Stearns, dorsal view, 17.1? x 1-.2. 



1*. Onchidelhi HiHiieiii Stearns, ventral view. 



3. Ci/praa itiahiila-inrrkinui Stearns, ol>.0 X "-L'. 



4. Ciipraa ifialxila-mvx'uuiia Stearus. 



.">. Ttvtariiis atiipluis Stearns. (>.25 X 4.0. 



t>. rro(N7/a ><'(/onj Stearns, 3l).0 alt. 



7. VranHla ra/hui Stearns, 34.0, max. diaui. 



8. Chlorofloma ijallhia var. miiUiJilo'^a Stearns, 'MkO. 



9. Vhlorostoma yallina var. mnUiJilo^ii Stearns, 34.0, max. diaiu. 



