358 



Fossils of the Calciferous Sandrock. 



Murchisonia Anna. (N. s.) 



**i 



Fig. 8. 



a Murchisonia Anna. 



b — e Small specimens supposed to be of this species. 



g Murchisonia linearis. 



h — k Pleurotomaria gregaria. 



I Eunema prisca. 



Fig. 8. — a, d. 



Description. — Elongate, apical angle about 20° ; whorls, ten or 

 twelve, flattened in their upper two-thirds, rounded near to and 

 into the suture. About the middle of the lower half of the whorl 

 there is a narrow flat spiral band, which, on the body whorl of 

 large specimens, is one line or a little more in width, but becomes 

 gradually narrower to correspond with the decreasing dimensions 

 of the upper whorls. The fine striae are most conspicuous on the 

 upper part of the whorl, their course being from the suture down- 

 ward, and backward with a sigmoid curve to the band. On some 

 of the specimens there are also numerous undulations in the shell 

 which follow the course of the striae. Length of full grown spe- 

 cimens, about three inches; but accompanying these there are 

 multitudes of smaller ones of all sizes, from the length of two lines 

 to two inches. Many of these small ones have the whorls nearly 

 regularly convex and may constitute new species ; but, at present, 

 I think they are only the young. 



This species, especially in the small specimens, somewhat re- 

 sembles M. gracilis, (Hall) but is easily distinguished therefrom 

 by the flatness of the upper part of the whorls. It is more closely 



