292 
Aug. F. Foerste 
I have obtained casts of the same from the ferruginous sandstones 
in the higher part of the group. The types of the latter are 
illustrated by Figs. 7b and 7c on plate 82, and were obtained from 
Pulaski, in other words from the same locality as the type of 
Conrad’s species Cymatonota pholadis. Of the two illustrations 
of Cymatonota parallela, only 7c is serviceable in the identifica- 
tion of this species, and this is described in the descriptive matter 
accompanying the plate as ^The left valve, preserving the shell, 
which is finely striated concentrically, and shows the folds upon 
the cardinal line. ” In the text the species is described as having 
few oblique strong wrinkles along the dorsal margin.” No 
consideration need be given in this connection to figures 7a and 
7d on the same plate since these illustrate a species of Ortho- 
desma obtained at Cincinnati, Ohio, erroneously referred to the 
same species. The original of Fig. 7c has the relative height 
and length indicated by the figure, except that the lower part of 
the posterior margin should be prolonged. The original of Fig. 
7h is a much better specimen than the published drawing suggests. 
In view of the fact that Cymatonota pholadis and Cymatonota 
parallela both came from the same type locality, and that speci- 
mens referred to the latter are common while no other specimen 
having the exact dimensions of Cymatonota pholadis have ever 
been found in New York subsequent to the original description, 
it becomes pertinent to inquire if Cymatonota pholadis may not 
have been an aberrent specimen of Cymatonota parallela. In 
the absence of the type of Cymatonota pholadis, which had been 
lost apparently even before Hall wrote his work, this question can 
not be answered with absolute certainty, but it is extremely 
probably that the type of this species was merely a compressed 
specimen of the species later described by Hall as Orthonota 
( = Cymatonota) parallela. 
Specimens of Cymatonota have been collected a short distance 
below the railroad bridge, about a mile east of Pulaski, in the 
same rock slab with Modiolopsis modiolaris, and Ischyrodonta 
unionoides, and they continue to be found for several hundred 
yards westward, where they occur associated with Trinucleus. 
A specimen 34 mm. in length had a height of 10.5 mm. near the 
posterior end, and of 9 to 9.3 mm. at the beak; the anterior mar- 
gin extends between 6 and 7 mm. anterior to the beak, and the 
straight cardinal margin reaches 23 or 24 mm. posterior to the 
