MAZATLAN UNIVALVES 425 
only of the whirls is spirally sculptured. Zong.*081, long. spir. 
‘061, lat. °025, dav. 14°. 
Hab.—Mazatlan ; 2 sp. off Spondylus; L’pool Col. 
Tablet 1984 contains the largest specimen. A hole behind. 
displays the plait. 
515. CHRYSALLIDA PHOTIS, 2. s. 
Chr. t. albidd, gracili, solute spirali ; vertice nucleoso ut in 
“Ohr. converd” sito, sed multum minore, marginihus spire 
valde excurvatis haud superante; anfr. normalibus iv. valde 
convexis, ut in “‘ Phote” cancellatis, liris transversis nodosis Xi. 
ad suturas valde impressas attingentibus, decliviter ad verticem 
ascendentibus, ad basin continuis ; Lirulis spiralibus supra liras 
nodosis, inter eas eleganter undulatis, quarum iv. in anfr. penult. 
apparent ; anfr. ult. contracto ; aperturd continua, ovali, postice 
contracta ; plicd obliqua, celata. 
This very elegant little shell is sculptured as in Phos, with 
the tumid whirls of Aclis, the apex of Chemnitzia, and the 
aperture of Chrysallida. The plait is scarcely seen in the 
perfect shell, but conspicuous in the broken one. long. *049, 
long. spir. ‘032, lat. °019, div. 12°. 
Hal.—Mazatlan ; 2 sp. off Spondylus; L’pool Col. 
Tablet 1985 contains the perfect specimen. 
516. CHRYSALLIDA INDENTATA, 2. 8. 
Chr. t. obtusiore, alhd, subconicd ; vertice nucleoso helicoideo, 
satis mugno, marginibus spire rectis vie superante, haud pro- 
minente, anfr. 1. glohosis, subverticaliter sitis, apice conspicuo ; 
anfr.gormatlibus subconvexis, ad suturam impressam & liris sub- 
nail : liris acutis, subrectis, circiter xvii. infra sutuwram 
subindentatis ; testa juniore ad peripheriam pene evanidis, 
lineis circa basin vin conspicuis ; striis spiralibus, inspira 
circiter v. interstitia decussantibus, eleganter wndulatis ; cirea 
basin striis crebrioribus, inter lineas transversas undulatis ; 
£. adulta, liris circa basin continurs, sculpturdé spirali superan- 
tibus ; aperturé pyriformt, continud, postice contractd ; labro 
ad busin vie effuso ; labio separato ; columella haud contorté ; 
? plicd celata. 
