Wappinger Valley Limestones. 147 



that these little shells are either the young, or else fragmentary 

 portions near the beak, of L Stissingensis. 



In the above description 1 have associated in the same species 

 the specimens found in the calcareous shale, and those found in 

 the compact limestone. There are some points of difference, 

 especially in size ; those in the shale are decidedly larger than 

 those in the limestone, which may be due to more congenial 

 sediment. The number found in the limestone however is too 

 small to justify any strong conviction on this point. 



Should it be ascertained hereafter that there are specific dif- 

 ferences between these fossils, I should consider the specific 

 name here given to belong to the^ specimens found in the lime- 

 stone of which those corresponding to figs. 5 and 6 are the 

 types. 



Fragments of the front portion of this black shell are abun- 

 dant and conspicuous in the shale, and in the absence of the 

 associated fossils would readily be mistaken for fragments of 

 Lingulepis pmniformis. Close inspection will however reveal 

 this difference. The concentric ridges or laminae of L. pinni- 

 formis (at least as exhibited in Dutchess County, N. Y.) are 

 feebly defined when magnified, and often run together ob- 

 scurely ; while those of Kutorgina Stissingensis as viewed with 

 a strong triplet, are deeply cut, and in the front portions even, 

 they are generally individualized with exquisite perfection. 



This Kutorgina is related to K. Labradorica Billings ; but the 

 beaks are less elevated than the specimens figured of that spe- 

 cies, and the peculiar surface ornamentation is different. 



Olenoides Stissingensis, n. sp. Plate VI, figs. 9-15. 



Body elongate ovate ; in the single full-length specimen found, 

 slightly over three centimeters in length. 



Head large, semicircular, with apparently slight notches in 

 the anterior outline, at the points of intersection with the facial 

 suture. Eyes elongate and large. 



Glabella elongate, its length in front of the occipital furrow, 

 being nearly one and two thirds times its least width ; a little 

 expanded at the rounded anterior extremity, the sides slightly 

 incurved along the posterior half, so that the shortest transverse 

 diameter is a little in front of the posterior extremity. Dorsal 

 furrow everywhere well defined, though not deep ; inclined to 

 be rather broad along the lateral edges. Glabellar furrows 

 three, or in some specimens, four ; the first pair are broadly and 

 deeply impressed in the edges of the glabella, at a point about 

 one-fourth of the longitudinal diameter from the posterior ex- 

 tremity ; from here they pass very obliquely backward, shallow- 

 ing and narrowing rapidly, until quite near to the posterior 

 margin, they are joined by a shallow transverse furrow. The 



