106 



The detached fragment from which fignre 2a of plate 13 was drawn 

 was bi'oken out of the same argillaceous nodule as the Ammonite, and 

 probably once formed part of the shell of the latter. If this supposition 

 be correct, it would appear that the outer lip of the adult shell when 

 perfect bore a simple, elongated and rather narrowly rounded lobe or ear 

 on each side. 



Two very small Ammonites, collected by Mr. Eichardson on the South- 

 West side of Denman Island, in Division B, the largest of which is less 

 than three-quarters of an inch in its greatest diameter, are believed to be 

 also referable to A, Indra. 



Group IV. — Macrocephaliy Von Buck. 



Spb-genus Stephanoceras, Waagen (Pars.) — Geognostich-Palaeontologische Beitrage, 

 Von Dr. E. W. Benecke, Munchen, 1869, Vol. II., p. 248. 



Ammonites complexus, var. Suciensis, Meek. 



Ammonites complexus, var. Suciensis, Meek. — Proc. Ac. Nat. Sc, Phil., 1861, Vol. XIII., 



p. 317. Bui. Geol. and Geogr. Sur. of 

 Terr., Vol. II., No. 4, p. 369, pi. 5, figs. 

 2, 2 a, 6 and c. 



Ammonites Brewerianus, Gabb (Pars.) — Pal. Cal., Vol.1., pi. 27 and pi. 28, fig. 19, 



but not those figured under the same 

 name on plate 10 of the same volume. 



Ammonites complexus of Hall and Meek, from the Cretaceous deposits 

 of the Upper Missouri country and Atlantic coast, was described from 

 small and imperfect specimens, and the characters of the species are 

 very imperfectly ascertained. In reference to the very similar Ammonite 

 from Comox and the Sucia Islands, Mr. Meek remarks — "After a 

 careful comparison I am left in doubt whether it should be regarded as 

 a variety of A. complexus (Hall and Meek) or as a distinct species." " It 

 certainly is a much more compressed shell ; the volutions of A. complexus 

 being nearly twice as wide transversely as from the dorsal to the ventral 

 side, while these two diameters of the whorls in the form before me are 

 nearly equal." " Differences of this kind, however, are not generally 

 reliable as a means of distinguishing species in this group ; though the 

 few specimens yet brought from Nebraska, as well as those found in New 

 Jersey, do not shew any essential variations in this respect."* This 



* Bulletin ol the Geological ana Geographical Survey of the Territories, Washington, 18T6, 

 Vol. II., No. 4, p. 369. 



