MAZATLAN UNIVALVES 443 



. Mazatlan ; 9 sp. off Chama and Spondylus ; L'pool Col. 

 Tablet 2028 contains an exquisitely perfect young sp. with 

 the gl ossy nucleus ; and an adult, with the lip imperfect. 



557 b. CEEITHIOPSIS PTUBEECULOIDES, var. ALBONODOSA. 



C. ? tuber culoides t. rufo-fuscd, tuber culls distaniioribus, al- 

 bidis ; anfr nucleosis iv. parum extantibus, subcarinatis. 



Tablet 2029 contains a young shell and portions of adults 

 differing as above indicated. Whether they be of specific value 

 cannot be decided till more specimens are found. 

 Hab. Mazatlan ? extremely rare, off Spondylus ; ISpool Col. 



558. CEEITHIOPSIS CEEEA, n. s. 



C. t. "C. tuberculoidei" simili, sed albido-corned, subdiaphand, 

 gracili ; anfr. primis subcarinatis, hand subito sculpturam 

 normalem monstrantibus ; anfr. tumidioribus, suturis impressis ; 

 lineis radiantibus ad peripheriam haud continuis ; carimdis iii. 

 ad et infra peripheriam, acutioribus, interstitiis latis, tenuis- 

 sime et creberrime decussato-striatis ; labro tenui, labio vix 

 monstrante. 



Only one perfect specimen was found of this beautiful 

 species, which differs from C. tuberculoides in its waxen colour 

 and texture, in the more delicate sculpture, and in the pattern 

 of the periphery and base. Long. "095, long.spir. '07, lat.'Q43, 

 div. 22. 

 Sab. Mazatlan ; 1 sp. off Spondylus ; L'pool Col. 



Tablet 2030 contains the specimen. 



559. CEEITHIOPSIS PUPIFOEMIS, n. s. 



C. t. " C. tuberculoidei" si/mili, sed multo minore, pupiformi, 

 rufo-fuscd, seu fusco-aurantia ; anfr. nucleosis, iv. l&vibus, hand 

 elongatis ; normalibus iv-v., inarginibus spires valde excurvatis ; 

 suturis impressis ; carinis valde rotundatis iii. in spird t valde 

 tuberculatis, iii. ad et infra peripheriam, interstitiis minimis ; 

 labro in adultd tenuiore, labio conspicuo. 



This little shell, in the thinness and contraction of the 

 aperture, somewhat resembles Chrysallida. Both the complete 



