WHITEAVE8.] CRETACEOUS FOSSILS FROM MANITOBA. 189 



26 W., J. B. Tyrrell, ISST : an imperfect right valve. All from the 

 Fort Benton group, or lower part of the series. 



The specimens described above seem to be very nearly related to the 



Volsella* (Brachydontes) multilinigera^ of Meek, from "Cretaceous 



sandstones at Coalville, Utah," but they appear to differ therefrom in 



their much more broadly rounded umbonal slopes, and in the greater 



prolongation of their anterior extremity beyond the beaks. 



CEPHALOPODA. 



Belemnitella Manitobensis. (N. Sp.) 



Plate 26, figs. 3, 3a and 3b. 



Guard of medium size, elongated and projecting beyond the apex of 

 the phragmocone to a distance of about four inches, acutely pointed 

 posteriorly and subcylindrical anteriorly; apex eccentric ; outline of 

 a transverse section at the thicker end broadly ovate or ovately sub- 

 circular. Vascular impressions consisting of two distinctly defined 

 longitudinal and nearly straight, impressed lines, one of which is 

 placed on each side of the narrowest part of the guard, and presu- 

 mably, therefore, on its dorsal surface. These dorsal impressions 

 commence at a short distance from the apex and extend to the broken 

 anterior termination of each specimen. The central portion of the 

 presumed ventral surface is marked also by a somewhat similar, but 

 not quite so clearly defined, median impressed line, and by a few 

 extremely faint and irregular impressed striae, which run nearly 

 parallel with it, but which radiate slightly outwards towards the apex. 

 Apart from these longitudinal markings, the general surface is 

 perfectly smooth. Alveolar cavity and phragmocone unknown. 



East bank of the Assiniboine Eiver, a short distance below the 

 mouth of the Little Souris Eiver, D. Armit, 1876: one specimen. 

 Ochre Eivei*, Eiding Mountains, D. Arrait, 1884 : one specimen. 



Verftiilion Eivei', Township 24, Eange 20 W. ; one specimen: South 

 Duck Eiver, Township 34, Eange 23 W. ; one fragment: Swan Eiver, 

 Township 35, Eange 29 W. ; one fragment : J. B. Tyrrell, 1887. 



Assiniboine Eiver, Section 36, Township 8, Eange 11 W., Warren 

 Upham, IBS? : one specimen. All from the Niobrara group, or upper 

 part of the series. 



* Mr. Meek has claimed that the name Vohella, Soopoli, shoald be used for this genus rather 

 than Modiola, Lamarck, but in this view he is not followed by authors of the most modem 

 manuals of palaeontology or conohology. 



t U. S. Geol. Surr. Terr., Contr. to Palaeont., by Dr. C. A. White, 1880, Nos. 2-8, p. 18, pi. 11, 

 fig. 3 a. 



11* 



