430 MAZATLAN UNIVALVES 



Sab.— Mazatlan ; extremely rare, off Spondylus ; L'pool Col. 



Tablet 1995 contains a specimen presented by R. D. Dar- 

 bishire, Esq. 



(c.) Gibbous and uncertain species. 



525. Chemnitzia gibbosa, n. s. 



Ch. t. pupiformi, rufo-fuscd,, spirce marginibus utrinque ex- 

 curvatis ; vertice nucleoso ?... ; ayifr. normalibus x., planatis ; 

 liris transversis subexpressis, subrotundatis, rectis, circiter x\"iii. 

 ad apicem continuis ; labro 1 



This species is described, although from a solitary and verj' 

 imperfect specimen, in consequence of its great peculiarity of 

 form, in which it resembles Chrysallida. It is short, stumpy, 

 and very broad ; without any trace of fold on the columella or 

 notch on the base. Long. '27, lat. '1, div. 25". 



Hab. — Mazatlan ; off Chama, extremely rare ; L'pool Col. 



Tablet 1996 contains all that was found, viz. the broken 

 specimen, and a fresh fragment displaying sculpture. 



526. Chemnitzia , sp. ind. (a.) 



Tablet 1997 contains the spire of a very stout shell, with 

 about 12 very stout ribs on each whirl, nmning in continuous 

 diagonal lines to the apex. There is no trace of colimiellar 

 plait. 



Hab. — Mazatlan : 2 sp. off Spondylus ; L'pool Col. 



b'2il. Chemnitzia , sp. ind. (h.) 



Tablet 1998 contains the spire of a Eulimoid shell, of alabas- 

 trine texture, with about 20 extremely faint ribs, running in 

 diagonal lines to the apex. It is not so broad as the last species. 



Hab. — Mazatlan ; 1 sp. off Spondylus ; L'pool Col. 



528. Chemnitzia , sp. ind. (c.) 



Tablet 1999 contains a verj' small specimen of a large species, 

 too young to identify-, as it has only one normal whirl and a 

 half, strongly shouldered, and with numerous very fine ribs in 

 the upper part. The sinistral portion is large, and the jimction 

 of the two ia very conspicuous. Long. "035, lat. '019. 



Hab. — ^Mazatlan ; 1 sp. off Spondylus ; L'pool Col. 



