324 PALJEONTOLOGY OF NEW YORK. 



Tho three specimens figured are of about the same dimensions, having a 

 length of 17 mm. and a height of 13 mm. 



This species resembles N. RandaUi, but is a shorter form, broader posteriorly, 

 and with a more arcuate cardinal line. It has been I'eferred to Tellinomya by 

 some authors, but in the specimens described (see fig. 31) there is a distinct 

 cartilage pit beneath the beaks, which character does not belong to Tellinomya 

 or Pal^onetlo. A comparison of the specimens figured with the type of the 

 species shows their identity. 



Formation and localities. In the sandstones of the Waverly group, at Newark 

 and Richfield, 0., and near Hillsdale, and at Battle Creek, Mich. 



NUCULITES, Conrad. 1841. 



NUCCLITES OBLONGATUS. 



IT.ATE XLVII, FIGS. I-IJ, 



Nvctdltex Moiigata, Conrad. GpoI. Siirv. N. Y., Aim. Rep., \i. ;'>(), |)liite, fig. 8. 1841. 



" " " Hall. Prelim. Notice Ijimellibranchiata, 2, j). 4. 1870. 



" " " •• Pal. N. Y., vol. V, pt. 1. Plates ami Explanations: PI. 47, figs. 



1-12. 1883. 

 Nuenldf Mmiga, Hall. Geol. Siirv. N. Y., Rep. Foiii'tli DLst., pp. 196-7. 1843. 



Shell somewhat larger than the prevailing forms belonging to this group, elon- 

 gate-ovate, widest at the anterior end; length usually more than twice the 

 height ; ba.sal margin nearly straight, .sometimes gently arcuate ; posterior 

 extremity narrow and abruptly rounded. Cardinal line slightly oblique, 

 gently arcuate; just anterior to the beaks a small portion of the hinge is bent 

 abruptly downward, reaching to the anterior muscular scar. Anterior end 

 short and rounded, defined in the cast by the vertical clavicle. 



Valves depressed-convex in the lower find posterior portions, more convex 

 on the anterior end and in the umbonal region. 



Beaks at about the anterior fourth, appressed, not rising above the hinge- 

 line. Umbonal slope broadly rounded and undefined, extending to the post- 

 inferior extremity. 



Test thick in the upper part of the shell. Surface marked by very fine 



