MAZATLAN tJNIVALVES 425 



only of the whirls is spirally sculptured. Long. "081, long. spir. 

 •061, lat. -025, div. 14". 



^a6.— Mazatlan ; 2 sp. off Spondylus ; L'pool Col. 



Tablet 1984 contains the largest specimen. A hole behind 

 displays the plait. 



515. Chetsallida Photis, n. s. 



CJir. t. alhida, gracili, solute spirali ; vertice nucleoso ut in 

 " Clir. convexa" sito, sed muUum minore, marginibus spires 

 valde excurvatis hand superante ; anfr. normalibus iv. valde 

 convexis, ut in " Phole" cancellcdis, liris tvansversis nodosis xii. 

 ad suturas valde inqjressas 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. eontracto ; apertura continud, ovali, postice 

 contractu ; iolica obliqud, celatd. 



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, 

 lo)ig. sjrir. -032, lat. '019, div. 12". 



Sal. — Mazatlan ; 2 sp. off Spondylus ; Z'pool Col. 



Tablet 1985 contains the perfect specimen. 



516. CHEYSALIilDA INDENTATA, n. S. 



CJtr. t. obtusiore, albd, subconicd ; vertice nucleoso helicoideo, 

 satis magna, marginibus spirce rectis vix superante, haud pro- 

 minente, anfr. ii. glohosis, subverticaliter sitis, apice conspicuo ; 

 anfr. normalibus subconvexis, ad suturam impressam a liris sub- 

 muricatis ; liris acutis, subrectis, circiter xviii. infra stitiiram 

 subindentatis ; testd juniore ad peripheriam pcene evanidis, 

 Uneis circa basin vix conspicuis ; striis sjjiralibus, in spird 

 circiter v. interstitia decussantibus, eleganter undulatis ; circa 

 basin striis crebrioribus, inter lineas transversa^ undulatis ; 

 t. adultd, liris circa basin continuis, sculpturd spirali superan- 

 tibus ; aperturd 2>!jriformi, continud, postice contractd ; labro 

 ad basin vix effuso ; labia separafo ; columella haud contortd ; 

 ? plied celatd. 



