MIOCENE MOLLUSCA AND CRUSTACEA. Cs 
DIONE SAYANA Conrad. 
Plate x11, fig. 1. 
Cytherea convexra Say; Jour. Acad. Nat. Sci. Phil, Ist ser., vol. 4, p. 149, Pl. xu, 
fig. 2. 
Cytherea Sayana Conrad; Miocene Foss., p. 13, Pl. vi, fig. 3, reprint of Say’s plate; 
Tuom. and Holmes, P. I’. South Carolina, p. 83, Pl. xx1, fig. 9; Emmons, Geol. 
N. C., p. 294, fig. 1; Heilprin, Proc. Acad. Nat. Sci. Phil., 1887, pp. 401 and 403. 
Dione Sayana Conrad; Proc. Acad. Nat. Sci. Phil., 1862, p. 575; Meek Check List, 
Miocene Foss., p. 10. 
Below I give the descriptions of this shell by both Dr. Say and Mr. 
Conrad, as they differ somewhat. Mr. Say’s description is: ‘Shell subcor- 
date; elevated convex, concentrically wrinkled, inequilateral; posterior 
tooth and fosset not striated; edge not crenated; umbo rather prominent; 
lunule dilated, cordate, marked by a simple line.” 
Mr. Conrad’s gives the following characters: ‘ Shell subcordate, ventri- 
cose, rather thin, concentrically wrinkled, inequilateral; umbo prominent; 
posterior extremity rounded; lunule dilated, cordate, marked by a simple 
line; anterior cardinal tooth pyramidal, robust. 
It is very evident that the latter description has been written with the 
former before the author, as much of the same language is used. Conrad’s 
statement that the shell is ‘rather thin” I have not found to be correct in 
any of those I have examined; on the contrary they appear to be generally 
rather the opposite. I have not seen specimens from any other New Jersey 
localities than the well-boring of Mr. Woolmans at Atlantic City, and there are 
only two fragments retaining the hinge portion of the valve, and these have 
been much waterworn before being reembedded; consequently none of the 
features can be seen except the general form. I think there is no question 
as to the identity of the shell, but the specimens are altogether too poor for 
figuring and for the determination of the species by others, so I have copied 
Mr. Say’s original copperplate figure. 
The specimens are the property of the Academy of Natural Sciences at 
Philadelphia. 
