MAZATIiAN TJNIVALVE3 443 



Sah. — 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 Up imperfect. 



557 5. Ceeithiopsis ?tubeeci:ioides, «ar. albonodosa. 



C. Huberci(loides t, riifo-fusca, tuhermdis distantioribKS, al- 

 bidis ; anfr nucleosis iv. parum extantihus, suhcarinatis. 



Tablet 2029 contains a young shell and portions of adults 

 differing as above iudicated. Whether they be of specific value 

 cannot be decided tUl more specimens are found. 



^ai.— Mazatlan ? extremely rare, off Spondylus ; L'pool Col. 



558. Ceeithiopsis ceeea, n. s. 



C. t. "C. tuherculoidei" simili, sed alhido-corned, suhdiaphand, 

 gracili ; anfr. 2^t'imis suhcarinatis, Jiaiul suhifo sculpturam 

 normalem monstrantihus ; anfr: fumidioribus, sttfuris impressis ; 

 lineis radiantihiis ad peripheriam hand continuis ; carinulis iu* 

 ad et infra peripheriam, acutioribtis, interstitiis latis, tenuis' 

 sime et creherrime decussato-striatis ; lahro tenui, labia 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. Loiiff. '095, lo>ig.spir.'07, lat.'04^, 

 div. 22°. 



Sah. — Mazatlan ; 1 sp. off Spondj-lus ; L'pool Col. 



Tablet 2030 contains the specimen. 



559, Ceeithiopsis pupifoemis, n. s. 



C. t. "C. tuherculoidei" simili, sedmulto minore, pupiformi, 

 nifofuscd, seufusco-aurantid ; anfr. nucleosis, iv. Icevibiis, hand 

 elongatis ; normalihxis iv-v., marginihus spircB valde excurvatis ; 

 suttiris impressis ; carinis valde rotundatis iii. in spird, valde 

 tuherculatis, iii. ad et iifra pi&i'ipJieriam, interstitiis minimis ; 

 labro in adulfd tenuiore, labia conspicuo. 



This little sheU, in the thinness and contraction of the 

 aperture, somewhat resembles Chiysallida. Both the complete 



