* / < T 



CHAZY LIMESTONE. 29 



The strisc on the side of the shell, near the mouth, bend backwards more than is 

 represented in the figure. 



Fig. 2 a. An obliquely lateral view of the specimen, showing the spire, with the strise upon the surface 



of the shell. 

 Fig. 2 b. View of the spire denuded of the shell. 



Position and locality. This species occurs in the lower fine-grained limestone, at Chazy, 

 Clinton county, where it is associated with the following species, but never with the 

 preceding one.. (State Collection.) 



., ,* 49. 2. RAPHISTOMA STAMINEA (n. 5;j.). 



Pi,. VI. Figs. 4, 5, 5 a. 

 Maclurea lahiata ? Emuions, Geol. Report, 1842, as above. 



Compare with the last described species. 



Discoidal, depressed towards the margin, with the central portion of the spire rising 

 somewhat above the outer volution ; volutions about four or five, sharply angulated on the 

 outer side, nearly flat above and subventricose beneath ; surface marked by strong elevated 

 rounded stri», which, bending in a curve backwards from the suture, are interrupted along 

 the centre of the upper part of the whorl by a concentric elevated line (fig. 5), passing the 

 sharp angle of the volution ; the strise bend abruptly forwards, and, curving gently around, 

 pass into the umbilicus ; cast of the inner volutions rounded above. 



Breadth about once and a half the height. 



This species is clearly indicated by the strong concentric line or imbrication which 

 interrupts the striae upon the upper surface of the volutions. I have, however, seen some- 

 thing of the kind obscurely indicated upon the last described .species. No such concentric 

 line or interrupted strire (indicating the generic character) are mentioned or indicated in the 

 descriptions and figures referred to, and it is therefore proper to regard this as a distinct 

 species. 



The specimen fig. 4 differs so little from the type of the species, that, for the present, it 

 is united with the same. Numerous imperfect specimens have been found in this rock, 

 indicating several distinct species ; but I have not yet been able to define their characters 

 with sufficient precision to describe them. 



Fig. 5. View of the spire, the inner volutions partially denuded of the shell. 



Fig. 5 a. A lateral view, showing the aperture, which is distorted by crushing from above. The denuded 



spire is shown to rise considerably above the outer volution. The strife upon the side do 



not bend forward as much as in the original. 



Position and locality. In the lower granular portion of the limestone, at Chazy village, 

 Clinton county. 



