MAZATLAN UNIVALVES 4A3 
Hab. —Mazatlan; 9 sp. off Chama and Spondylus ; L’pool Col. 
Tablet 2028 contains an exquisitely perfect young sp. with 
the glossy nucleus ; and an adult, with the lip imperfect. 
557 0. CERITHIOPSIS PTUBERCULOIDES, var. ALBONODOSA. 
C. 2tuberculoides t. rufo-fuscd, tuberculis distantioribus, 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 ; L’pool Col. 
568. CERITHIOPSIS CEREA, 2. S. 
C. t. “C. tuberculoidet” simili, sed albido-corned, subdiaphana, 
gracili ; anfr. primis subcarinatis, haud subito sculpturam 
normalem monstrantibus ; anfr. tumidioribus, suturis Impressis 3 3 
lineis radiantibus ad perioh eri iam haud continuis ; carinulis iii. 
ad et infra peripheriam, acutioribus, interstitiis latis, tenuis- 
sime et creberrime decussato-striatis ; labro tenui, labio vie 
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. °043, 
div. 22°. 
Hab.—Mazatlan ; 1 sp. off Spondylus ; L’pool Col. 
Tablet 2030 contains the specimen. 
559. CERITHIOPSIS PUPIFORMIS, 7%. s. 
C. t. “C. tuberculoidei” simili, sed multo minore, pupiforme, 
rufo-fuscd, seu fusco-awurantia ; anfr. nucleosis, iv. levibus, haud 
elongatis ; normalibus iv-v., marginibus spire valde excurvatis ; 
suturis impressis ; carinis valde rotundatis 11. in spird, valde 
tuberculatis, il. ad et infra peripherian, interstitiis minimis ; 
labro in adultd tenwiore, labio conspicuo. 
This little shell, in the thinness and contraction of the 
aperture, somewhat resembles Chrysallida. Both the complete 
