330 



first part of this volume, and to Lytoceras Timotheanum in the third and 

 fourth. Figure 2 of Plate in of the first part of this volume, which 

 was intended to represent a small specimen of A. Timotheanus from 

 Skidegate Inlet, is however not very satisfactory, the periodic constrictions 

 being much tooflexuousin the lateral region. In fact, the only difference 

 that the writer has been able to detect between the specimens from British 

 Columbia and Stoliczka s figures of A. Timotheanus is that, in the 

 former, these constrictions are nearly straight, as well as very oblique, on 

 the oides ; and in the latter they are slightly curved. And, it should also 

 be borne in mind, that, according to Dr. Kossmat, the geological horizons 

 of Tetragonites Timotheanus are the Upper Gault [and Lower Cenomanian, 

 so that everywhere else than in Vancouver Island, the species would 

 appear to occur in deposits that are much older than the Nanaimo group 

 or Senonian. 



These four specimens from Vancouver Island may be briefly indicated 

 as follows : 



One is a cast of the interior of the shell, with a small portion of the 

 test preserved, collected on the Puntledge or Comox River, near Comox, 

 by Mr. Harvey in 1895. Its maximum diameter is fifty-eighb millimetres, 

 it shows two oblique constrictions anterioily, but at some distance from 

 the aperture, and portions of the sutural line are preserved in places. 



Two are specimens, with the test preserved on one side, collected some 

 ten or twelve miles up the Nanaimo River by Mr. Harvey in 1901. One of 

 these is seventy-four millimetres, or nearly three inches in its greatest 

 diameter, the other seventy-one mm. The larger one shows a portion of 

 a constriction, at the aperture, the smaller one no indication of any con- 

 striction, yet the latter, in shape and size, is extremely similar to a 

 specimen from Cumshewa Inlet, in the Queen Charlotte Islands, collected 

 by Dr. G. M. Dawson in 1878, which shows six periodic constrictions. 

 Both show many minute oblique striae on the side, parallel with the direc- 

 tion that the constrictions always take in British Columbia specimens. 



The fourth is a specimen sixty-eight mm. in its maximum diameter, and 

 showing one periodic constriction, near the aperture, collected by the Rev. 

 G. W. Taylor, at Brennan Creek, in 1901. 



In each of these Vancouver Island specimens, the outer volution is dis- 

 tinctly subquadrate, the sides and the siphonal and antisiphonal region 

 being flattened. 



Stoliczka (op. cit) says that it is only the young shell of Ammonites 

 Timotheanus that is marked with from six to seven constrictions (juniori- 

 bus 6-7 sulcatis;. 



