154 
PALEONTOLOGY OP NEW-YORK. 
PRODUCTELLE OF THE CORNIFEROUS LIMESTONE AND HAMILTON 
GROUP. 
Productella sulfaciileata. 
PLATE XXIII. 
Produdus subaculeatus : Murchison, 1840, Bull, dela Soc. Geol. deFrance,Yol. xi, pa. 255, pi. 2, f. 9 a,b,c. 
Leptcena fragaria : J. de C. Sowerby, 1840, Transac. of the Geol. Society of London, 2d series, Yol. v, 
pa. 704, pi. 56, f. 5 and 6. 
- obionga? : Idem, Ibid, pi. 53, f. 29; not Pander. 
Produda - : Phillips', 1841, Pal. Foss, of Cornwall, pa. 59, pi. 25, f. 100. 
Produdus spinulosus (partim) : De Koninck. 1843, Desc. des Anim. foss. du terr. carb. de Belgium. 
p. 1?3 (fig. exclusis); not Sowerby. 
- subaculeatus (partim) : De Yerneuil, 1843, Russia and the Ural Mountains, Yol. ii, pa. 282, pi. 16,' 
f. 9, a, b, c. 
-(partim) : De Keyserling, 1846, Reise in das Petschora-land, pa. 203, pi. 199 (fig.ex.). 
Strophalosia subaculeata : King, 1846, Ann. and Mag. of Nat. History, Yol. xviii, p. 28. 
Produdus subaculeatus : De Koninck, 1846, Mem. de la Soc. royale des Sci. de Liege, Yol. iv, pa. 249, 
pi. 16, f. 4 a-d. 
“ “ De Koninck, Recherces sur les Anim. fossiles, 1847, pa. 142, pi. 16, f. 4 a, b, c, d. 
Ventral valve gibbous; length and breadth about as seven to eight : 
hinge-extremities angulated, and the margins being contracted a little 
below form small ears, while below this contraction the sides are 
regularly curved and the front is broadly rounded. The umbo is con¬ 
siderably elevated above the hinge-line, and the apex incurved. 
Surface marked by closely arranged concentric strife, and studded with 
slender rounded spines. On the upper part of the shell, and on the 
ears, these spines are round at the base, and rise directly from the sur¬ 
face. On the middle and lower part of the valve, there is a slight ele¬ 
vation of the surface a little above the base of the spine, but not a de¬ 
fined ridge. The number of spines on the individual figured has been 
sixty or more. 
The following is the description of this species^ given by De Koninck : 
“ Shell small, semiglobose, rounded. Dorsal valve not sinuate, very 
“ gibbous, rather regularly arched. The surface is ornamented with a 
“ great number of very faint strife of growth, and scattered over with 
“ tubes of which there usually remains only the circular or slightly elon- 
