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, margmibus sinrce recfis valcle superante, anfr. ui. 

 glohosis, verticaliter sitis, ajjice conspicuo ; anfr. Tiormalihus 

 suhplanatis, UruUs recfis circiter xx. minime exjrressis, vix 

 acuti-i, ad basin cvanidis ; striulis circa basin rotimdatam spir- 

 alibiis ; punctuUs 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. B. Ad. Fan. Shells, p. 167, no. 22i,) 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 arc 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 whiids and 

 measures long. "11, lat. "032, div. 13°. The sinistral apex is 

 fully "01 across. 

 ffa?i.— Mazatlan ; 1 sp. off" Spondjdus calcifer ; Havre Col. 



Tablet 2003 contains the specimen, kmdly presented by 

 S. Hanley, Esq. 



533. Chemnitzia teeebkalis, n. s. 



Ch. t. " Ch. ienuiliratce" siinili, sed curtiore, cnmpactA ; liris 

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

 suturamprofiindam coronantibus ; columella ad bctsin productA ; 

 labro ad siituram emarginato. 



A much shorter and broader shell in proportion than C. 

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

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

 lines. There is a slight slit at the suture, as ui Terobra, and 

 an approach to an angle at the base of the eolumeUa. 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. 



