138 Carl O. Dunbar, 



of the latter species, though not so narrow as the same plate in 

 Oriskania. 



The shape of the loop, which is preserved in two of the 

 writer's specimens, is the character which definitely convinced 

 him that this is really a distinct species. The descending lamellse 

 diverge Tapidly at first, and then by an almost even curvature 

 arch forward and then inward to where they meet anteriorly. 

 The loop thus formed is about as broad as long and subcircular 

 in shape. A slender process projects backward and upward 

 from the front center of the loop and a similar narrow process 

 extends straight forward from the center of the loop. The 

 triangular plate-like expansion of the loop seen in M. (f) ovalis 

 and Beachia suessana is here lacking. The loop in both speci- 

 mens has a drusy coating of tiny quartz crystals, and it can not 

 be demonstrated that the front margin of it was not broken oft' 

 before fossilization. Still, it is scarcely likely that both were 

 broken and both in the same shape, and it seems highly probable 

 that the loop is practically perfect, and as drawn in Figure 15. 

 Regardless of the front portion, the back part of the loop is 

 broader and more evenh' curved and rounded than in M. (F) 

 ovalis. 



The genus Mcgalaiilcris is in doubtful standing. If Suess' 

 determination of the nature of the loop in the genotype be cor- 

 rect, then neither this shell nor M. (f) ovalis has any relation 

 to that genus. There seems to be doubt on this point, and the 

 writer therefore has followed the New York Geological Survey 

 in referring these species doubtfully to Mcgalanteris. 



Occurrence: A common shell in the Harriman novaculite, near 

 Camden, Parsons, and Grandview. 



FAMILY SPIRIFERl6^ 



Delthyris cyrtinoides, n. sp. 

 Plate IV, figs. 1-3 

 Description: External aspect identical with the less alate 

 forms of D. pcrlaniellosa. Hinge-line varying from slightly less 

 to a little greater than the width of the shell below. Cardinal 

 angles varying from sharp to slightly rounded. Area one- 

 fourth to one-third as high as long. Deltidium very narrow. 



