NO. 9 NEW YORK POTSDAM-HOYT FAUNA 267 



Genus HYOLITHELLUS Billings 



Hyolithcllus Billings, 1871, Canadian Nat. and Geol., new ser., Vol. 6, p. 

 240. 



HYOLITHELLUS PAPILLATUS, new species 

 Plate 43, figs. 3 and 4 



Long", slender, cylindrical tube with a circular section. The largest 

 specimen in the collection has a length of 12 mm., with a diameter of 

 2 mm. A difference in diameter in the 12 mm. of length is not per- 

 ceptible. The surface is thickly studded with minute, rounded, flat- 

 tened papilla. 



This species differs from described forms in its papillose surface. 



Formation and locality. — Upper Cambrian: (m) At the top of 

 the Potsdam sandstone on ]\Iarble River, one mile (1.6 km.) south 

 of Chateaugay, Franklin County, New York. 



Genus PTYCHOPARIA Corda 

 PTYCHOPARIA MINUTA (Bradley) 



Plate 43, figs. 20-24 



Conoccphalites minuttis Bradley, i860, American Journ. Sci., 2d ser., Vol. 



30, pp. 241-242, text figs. 1-3. (Detailed description of species, with 



note by E. Billings.) 

 Conoccphalites minuttis ^adley, Billings, i860, Idem, pp. 242-243 (discus- 

 sion of species), and pp. 337-338, text figs. 4a-c. (Additional data on 



species and further discussion of it.) 

 Conoccphalites minntus Bradley, i860, Can. Nat. and Geol., Vol. 5, pp. 



420-421, and text figs. 1-3. (Reprint of paper in American Journal of 



Science noted above.) 

 Conoccphalites minittus Bradley, Billings, i860. Idem, pp. 422-425, and text 



figs. 4a-c. (Reprint of two notes in American Journal of Science noted 



above.) 

 Conoccphalites minntus Bradley, 1861, Proc. American Assoc. Adv. Sci., 



Vol. 14, pp. 161-163, and text figs. 1-3. (Reprint of paper mentioned 



in first reference.) 

 Conoccphalites minntus Bradley, Billings, 1861, Idem, pp. 163-166, and text 



figs. 4a-c. (Reprint of his two notes mentioned in the second reference.) 

 Conoccphalites minuttis Bradley, Hall, 1863, Sixteenth Ann. Rept. New York 



State Cab. Nat. Hist., pp. 150-151, pi. 8, figs. 5-7. (Describes species and 



compares it with C. minor.) 

 Conoccphalites minuttis Bradley, Hall, 1867, Trans. Albany Inst., Vol. 5, pp. 



134-135, pi. 3, figs. 5-7. (Reprint of the preceding reference, with same 



figures.) 

 Ptychoparia minutus Walcott, 1884, Monogr. U. S. Geol. Surv., Vol. 8, p. 91. 



(Refers to species and places it under Ptychoparia.) 



The very full description of the characters of the cephalon of this 

 species given by Alessrs. Bradley, Billings, and Hall are well repre- 

 sented by figures 20-22 on plate 43. The associated pygidium is shown 



