NO. 2.] DESCRIPTION OF THE FOSSILS. 93 



Cadoceras sp. ex. aff. Cad. Nanseni (n. sp.) was found together with 

 Leda cf. nuda Keys. sp. in a loose block of reddish-brown, somewhat coarse- 

 grained clay sandstone, July 12th, near the margin of the glacier northwest 

 of Elmwood. 



2. GROUP OF CADOCERAS MODIOLARE d'ORB. Sp. AND ELATMjE NIK. 



Cadoceras Frearsi {d'Orb. sp.) Nik. 



PI. II. fig. 10. 



Letter-press fig. 19. 



1845 (1844). Aimnonites Frearsi d'Orbigny ; Murchison, Verneuif et Keyser- 



ling, 'Geologic de la Russie', Vol. II. Paleontologie 

 p. 444. PL XXXVII. figs. 1, 2. 

 1881. Stephanoceras Elatmce S. Nikitin, 'Der Jura der Umgegend von 



Elatma'. Lfg. 1. Nouv. Mem. de la Soc. des Natural, 

 de Moscou. Vol. XIV. p. 34 e. p. PI. XI. fig. 22 a, b 

 (not 20, 21, 23). 

 1885. Cadoceras Frearsi S. Nikitin, 'Der Jura der Umgegend,von Elatma'. 



Lfg. 2. Nouv. Mem, de la Soc. des Natural, de Moscou. 

 Vol. XV. p. 15. Letter-press fig. 3. 

 We have before us the fragments of two whorls, of a young specimen. 

 The figured fragment of a whorl is as broad as high. The cross sec- 

 tion of the whorl is a short, broad oval, diminishing rapidly towards the up- 

 per end of the line of symmetry. The greatest thickness hes 

 closer to the umbilicus than to the outside. The arched 

 flanks converge rather rapidly towards the outside, which is 



Fig. 19. obtusely rounded. 



Cadoceras Frearsi _,, , , • , 1 -li -l u- u „ u* 



(d'Orb sp ) Nik. The whorl is ornamented with coarse ribs, which exhi- 



Lobe-line of PI. II jjij g^ forward flexure, and are only shghtly curved. Bifur- 

 fig. 10 a. 2 X , , , 



enlarged. cating ribs and single ribs alternate almost regularly. 



The lobe-line is somewhat asymmetrical, so that the form of the auxil- 

 iary lobes on both sides of the whorl is not quite identical. The course of 

 the lobe-fine agrees perfectly with that of a young specimen, now before me, 

 of Cadoceras Frearsi (d'Orb. sp.) Nik. from Elatma. In a size like that 



