432 MAZATLAN UNIVALVES 



Tablet 2002 contains the larger specimen ; the smallest is of 

 a much darker colour. 



532. CHEMNITZIA FLAVESCENS, n. s. 



Ch. t. gracillimd, tereti, flavescente ; vertice nucleoso heli- 

 coideo, marginibus spirce rectis valde superante, anfr. iii. 

 globosis, verticaliter sitis, apice conspicuo; anfr. normalibus 

 subplanatis, lirulis rectis circiter xx. minime expressis, vix 

 acutis, ad basin evanidis ; striulis circa basin rotundatam spir- 

 alibus ; punctulis creberrimis interstitia decussantibus, scepe 

 elongatis ; aperturd ? 



One somewhat imperfect specimen only of this species was 

 found by Mr. Hanley. It is intermediate between C. gracilior, 

 (C. S. Ad. Pan. Shells, p. 167, no. 224,) and C. undata. It is 

 however more slender than either, and differs from the first in 

 the very large size of the sinistral apex, and in the flattening of 

 the early whirls, which in C. gracilior are much swollen in the 

 early stage, though afterwards they are normally flattened. 

 The ribs are also fainter, and the interstitial spiral grooving 

 more decided. The specimen presents six normal whirls and 

 measures long. '11, lot. '032, div. 13. The sinistral apex is 

 fully '01 across. 

 Hob. Mazatlan ; 1 sp. off Spondylus calcifer ; Havre Col. 



Tablet 2003 contains the specimen, kindly presented by 

 S. Hanley, Esq. 



533. CHEMNITZIA TEEEBEALIS, n. s. 



Ch. t. " Ch. tenuiliratce" simili, sed curtiore, compact d ; liris 

 paucioribus (circiter xx.) ad basin evanidis, supra extantibus, 

 suturam profundam coronantibus ; columelld ad basin productd ; 

 labro ad suturam emarginato. 



A much shorter and broader shell in proportion than C. 

 tenuilirata, stronger, with the ribs evanescent Jbelow the peri- 

 phery, and muricating the suture ; they are not in continuous 

 lines. There is a slight slit at the suture, as in Terebra, and 

 an approach to an angle at the base of the columella. The 

 shell, which has 8 whirls, measures long. '097, long. spir. '071. 

 alt. '035, div. 20. 

 Hob. Mazatlan ; 1 sp. off Spondylus ; L'pool CoL 



Tablet 2004 contains the specimen. 



