DEVONIAN FAUNAS. 289 
SPIRIFER CONCINNUS Hall. 
Plate XXX, Hig. 3. 
Msda9osipirijern concomnus Hall, Pal) N-wY:, vol). 10D, p.\ 2008 ple 25; 
figs. 2 a-t, pl. 28, figs. 7a b. 
A single imperfect brachial valve from the upper beds of the Coey- 
mans limestone near Hainesville is referable to this species. The 
hinge-line is about equal to the greatest width of the shell, the lateral 
margins meeting the cardinal margin at about right angles. The 
mesial fold is prominent and rounded, continuing to the beak, without 
plications. Each lateral slope is marked by eight simple, rounded 
plications, which become fainter toward the cardinal margins, the 
last two or three being almost obliterated by reason of the exfoliated 
condition of the specimen. 
The dimensions of the specimen are: length, 13 mm.; width, 18 
mm. 
CYRTINA sp. undet. 
Plate XXX., Figs. 9-10. 
In the upper beds of the Coeymans limestone near Hainesville 
there occurs a species of Cyrtina which seems to be different from 
the only described Helderbergian species, C. dalmani Hall. The 
material is too imperfect for certain identification or for description. 
The larger specimens of the pedicle valve have a very high, slightly- 
concave, cardinal area, with a broad delthyrium. The median sinus 
is rather broad and shallow, and each lateral slope of the shell is 
marked by about three, broadly-rounded plications. 
RHYNCHOSPIRA FORMOSA (Hall). 
Plate XXXXT., Figs. 9-11. 
See, also, p. 240. 
This species has already been described from the Decker Ferry 
formation, although it is typically a member of the Helderbergian 
faunas. The Coeymans limestone specimens are usually somewhat 
more finely plicated than those in the Decker Ferry fauna, but they 
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