NO. 9 NEW YORK POTSDAM-HOYT FAUNA 275 



The largest specimen of a cranidium in the collection has a length 

 of i6 mm. 



Formation and locality. — Upper Cambrian, Hoyt limestone: (76) 

 Arenaceous limestone at Hoyts quarry, 4 miles (6.4 km.) west of 

 Saratoga Springs, Saratoga County, New York. 



Genus PROTICHNITES Owen 



Protichnites Owen, 1852, Quart. Journ. Geol. Soc. London, Vol. 8, p. 214. 



(Describes Protichnites septem-notatus and thus uses generic name.) 

 Protichnites Owen, Billings, 1857, Canadian Nat. and Geol., Vol. i, pp. 



35-39- (General remarks and quotations from Owen's paper of 1852.) 

 Protichnites Owen, Dawson, 1862, Idem, Vol. 7, pp. 271-277. (Discusses 



relations of Protichnites to the tracks of Limulus.) 

 Protichnites Owen, Chapman, 1864, E.xposition of the Minerals and Geology 



of Canada, pp. 159-160. (General remarks.) 

 Protichnites Owen, Billings, 1870, Quart. Journ. Geol. Soc. London, Vol. 



26, pp. 484-485. (Discusses Dawson's views and concludes that the 



tracks were made by trilobites.) 

 Protichnites Owen, Chapman, 1877, Canadian Journ. Sci., Lit., and Hist., 



new ser.. Vol. 15, pp. 486-490. (Discusses tracks and concludes that 



the so-called tracks of Protichnites and CUmactichnites are of fucoidal 



origin.) 

 Protichnites Owen. Dawson, 1890, Quart. Journ. Geol. Soc. London, Vol. 



46, pp. 599-601, figs. 4 and 5a. (States that Protichnites are indubitable 



tracks of crustaceans.) 

 Protichnites Owen, Pack.\rd, 1900, Proc. American Acad. Arts and Sci., 



Boston, Vol. 2>^, pp. 63-71. (Restricts use of Protichnites to tracks with 



individual footprints.) 



The first notice of the tracks subsequently named Protichnites 

 appeared in the Montreal Gazette in 1847. They were referred to as 

 the tracks of a tortoise. The editor, Mr. Abraham, called Mr. Wil- 

 liam E. Logan's attention to them and the latter subsequently made a 

 geological study of the region where they occurred in Beauharnois 

 County, Ontario, Canada. He ^ identified the sandstone as the Pots- 

 dam formation of the New York state geologists and took great 

 pains to have casts made of the first tracks for Prof. Richard Owen, 

 who at first thought that the tracks might be those of a tortoise.' 

 Later, with more material, he described the tracks under the generic 

 name Protichnites^ He described and illustrated six species, Pro- 

 tichnites septem-notatus, P. octo-imtatus, P. lattis, P. multinotatns, 



^ Quart. Journ. Geol. Soc. London, Vol. 7, 1S51, pp. 247-250. 



^ Idem, pp. 250-252. 



^ Idem, Vol. 8, 1852, p. 214. 



