348 WEST AMERICAN MOLLUSK8 STEARNS. 



Family tWSSlDID.l'L 



Ceiiiis CASSIS l.:iiii:uc-k. 



Snl>f,rtMnis CASMARIA 11. imd A. A.l. 



Casmaiia vibex Liimc 



All example of this form (M us. No. 88831) was detected on lliebeaeli at 

 tlie island of iNlaria jNIadre, of the TievS JMaiias, by jNIr. Fisher. It is a 

 erab sliell with the eolnmella considerably excavated by its alien tenant ; 

 the extreme upper or apex whorls are wantin<>'; otherwise the specimen 

 is in jiood condition, the surface polish and the color being intact, with 

 a hint of the broad obscure color bamls sometimes seeu in this species, 

 and the line dots or minute color spots that occur along- the liiu' of 

 the bands where they are intersected by lines of growth. Though a 

 small specimen, only o,> millimeters longby 21,5 millinu'ters in breadth, 

 it is solid antl mature, with a thick callus in the columella region and 

 a heavy rim to the outer lip, exteriorly broadened and i)rettily color- 

 marked, as frciiucntly seen in this species. This exami)le is incon- 

 spicuously obtusely noduse on the upper part of the basal whorl, which 

 is also slightly angulated below the suture. The lower i)art of the outer 

 lip, though sonu'what worn, shows faint crenulation. 



Another cxanqde of this species, the smooth, thin, inthited form, was 

 ct)llcctcd at Lai Pa/., on the opposite side of the Gulf, near the southern 

 extremity of Lower California, by IMr. L.Belding. Thishas*a thin <u" only 

 slightly thicki'ued rim to the outer lij); the color markings or spots on 

 the same arc inconspicuous, the dcj^osit of callus in the columella region 

 is slight, and the subsutural nodes of the basal whorl arc barely per- 

 ceptible. This also is a crab shell, the pillar very nuu-h worn away and 

 the ti}) of the apex is broken or worn otV; the surface of the shell is in 

 good condition and still exhibits its normal gloss. The Belding spi'ci- 

 men is considerably larger than the Fisher shell, and measures Ion. 

 44.'2r>, lat. 24.50 millimeters (Mus. No. 34184). 



Family ( ' V IMJ.KID.K. 

 (Minis CYPRiEA l.iiino. 

 Subgenus LUPONIA (iniy. 

 Liiponia Isabella— mexicana StiMins. 



riiito i„ Kins. ::, i. 



= r. coulrorirnd (irny, Sle.inis. I'loc I'tiihi. Atail. Nat. Sticncos, riiila. 1S78, p. ;>tH). 



In Sowcrby's monograph of Ct/pnvd in the Conchological Illustra- 

 tions, species 30, Fig. 13(», no liabitat stated, reference is nnule to 



