NO. 9 NEW YORK POTSDAM-HOYT FAUNA 259 



Genus CLIMACTICHNITES Logan 



Plates 38-40 



Climactichnitcs Logan, i860, Canadian Nat. and Geol., Vol. 5, pp. 279-285, 

 text figs. 1-5. (Describes and illustrates trails. Thinks they may have 

 been made by mollusks.) 



Cliniactichnites Logan, Jones, 1862, The Geologist, London, Vol. 5, pp. 138- 

 139. (Suggests that the trails are in fallen gallery-tracks of burrowing 

 crustaceans.) 



Climaciichniies Logan, Dawson, 1862, Canadian Nat. and Geol., Vol. 7, pp. 

 274-277. (Suggests that Climactichnites may have been made by a 

 crustacean allied to Limulus.) 



Climactichnites Logan, Chapman, 1864, Exposition of Minerals and Geology 

 of Canada, p. 160. (Brief remarks on genus.) 



Climactichnites Logan, Billings, 1870, Quart. Journ. Geol. Soc. London, 

 Vol. 26, p. 485. (Considers that both Protichnites and Climactichnites 

 trails may have been made by same animal.) 



Climactichnites Logan, Chapman, 1877, Canadian Journ. Sci., Lit., and Hist., 

 Vol. 15, pp. 486-490. (Suggests fucoidal origin of Climactichnites 

 trails.) 



Cliniactichnites Logan, Todd, 1882, Trans. Wisconsin Acad. Sci., Vol. 5, pp. 

 276-281. (Describes and illustrates C. youngi Chamberlin MS., and 

 concludes that the trails were not made by crustaceans.) 



Climactichnites Logan, Dawson, 1890, Quart. Journ. Geol. Soc. London, Vol. 

 46, pp. 596 and 600. (Same conclusion as in 1862, with a good illustra- 

 tion.) 



Climactichnites Logan, Woodworth, 1903, Bull. New York State Mus., No. 

 69, pp. 956-966. (Describes trails and elongate oval bodies at end of 

 trails, as remains of animal that made trail. Suggests molluscan origin.) 



Climactichnites Logan, Clarke, 1905, Bull. New York State Mus., No. 80, pp. 

 18-20, pi. 3. (General description of the trails described by Wood- 

 worth.) 



Until after the appearance of Woodworth's description and illus- 

 tration of the trails found at Mooers, Clinton County, New York,^ 

 there was very little more than conjecture as to the nature of the 

 animal that made the trails. The discovery of elongate oval bodies 

 at the terminations of each one of a group of trails (pi. 40, fig. 2) 

 immediately suggested a mollusk of some kind that had left a trace of 

 the under side of the foot. Woodworth's conclusions are : " 



1. The transverse ridges and their lateral extensions running forward to 

 the next transverse ridge were made by the same movement of some organic 

 structure lying transverse to the longitudinal axis of the organism. 



2. The unity, identity, and spacing of successive transverse ridges indicate 

 that they were made singly and in succession, that their spacing indicates the 

 forward stride of the organism, and that it went forward by a crawling, 

 hitching movement. 



'■ Bull. New York State Museum, No. 69, 1903, pp. 959-966. 

 " Idem, pp. 962, 963-964, and 966. 



