MAZATLAN UNIVALVES 425 



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

 '061, lat. '025, div. 14, 



Hob. Mazatlan ; 2 sp. off Spondylus ; L'pool Col. 



Tablet 1984 contains the largest specimen. A hole behind 

 displays the plait. 



515. CHBYSALLIDA PHOTIS, n. s. 



Ckr. t. albidd, gracili, solute spirali ; vertice nucleoso ut in 

 " Ckr. convexd" sito, sed multum minor e, marginibus spires 

 valde excurvatis hand superante ; anfr. normalibus iv. valde 

 convexis, ut in "P7iote" cancellatis, liris transversis nodosis xii. 

 ad suturas valde impressas attingentibus, decliviter ad verticem 

 ascendentibus, ad basin continuis ; lirulis spiralibus supra liras 

 nodosis, inter eas eleganter undulatis, quarum iy. in anfr. penult, 

 apparent ; anfr. ult. contracto ; aperturd continud, ovali, postice 

 contractor ; plica 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, 

 long. spir. "032, lat. '019, div. 12. 



Sal. Mazatlan ; 2 sp. off Spondylus ; L'pool Col. 

 Tablet 1985 contains the perfect specimen. 



516. CHEYSALLIDA INDENTATA, n. s. 



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

 satis magno, marginibus spirce rectis vix superante, kaud pro- 

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

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

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

 subindentatis ; testa juniore ad peripheriam pane evanidis, 

 lineis circa basin vix conspicuis ; striis spiralibus, in spird 

 circiter v. interstitia decussantibus, eleganter undulatis ; circa 

 basin striis crebrioribus, inter lineas transversas undulatis; 

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

 tibus ; aperturd pyriformi t continud, postice contractd ; labro 

 ad basin vix effuso ; labio separato ; columelld haud contortd ; 

 ? plied celatd. 



