281 



Cephalopoda. 

 Spyeoceras meridionale. (N. Sp.) 

 Plate 30, fig. 9. 



Shell longicone, slender, slightly curved and somewhat compressed, the 

 outline of a transverse section near the larger end being broadly elliptical 

 and not very far from circular. 



Test unknown : surface of the cast of the interior marked with straight, 

 narrow, annular, transverse ribs, that are rather close together at and 

 near the smaller or posterior end, but comparatively distant at and 

 towards the larger, anterior end. At and near the smaller end the ribs 

 are about one millimetre apart at their summits, but at the larger end 

 they are about four mm. apart, and much narrower than the rather shal- 

 low grooves between them. 



Septation, and shape and position of the sipliuncle unknown. 



The only specimen known to the writer, which was collected by Mr. 

 Dowling in 1902, is about sixty-five mm. in length. It is seven mm. in 

 diameter at the smaller end, and sixteen and a half at the larger. 



Tripleueoceras Robsoni, Whiteaves. 



Plates 31 (fe 32. The only figure in each. 



Tripleuroceras Rohsoni, Whiteaves 1898. Ottawa Naturalist, vol, XTI, no. 6, 



p. 123. 



Original description : " Shell large, robust, longicone, straight and 

 increasing very slowly in breath and thickness, flattened in the broad 

 siphonal and presumably ventral region, but rounded and much narrower 

 at the sides : characters of the antisiphonal side and nature of the surface 

 markings unknown. Sutures of the septa broadly and concavely arched 

 on the venter, nearly straight where they pass over the sides ; the three 

 or four next to the body chamber closer together than those which imme- 

 diately precede them. Siphuncle marginal, presumably ventral, large, 

 expanded between the septa and apparently nummuloidal. 



"Three imperfect and badly preserved casts of the interior of shells of 

 this species, from Stonewall, Manitoba, were presented to the Museum of 

 the Survey in the fall of 1897, two by Mr. W. H. Robson, of Lethbridge, 

 Alberta, and one by Mr. Donald Gunn, of Stonewall. The whole of the 

 antisiphonal and presumably dorsal region of each of these specimens is 

 buried in a very hard dolomitic limestone, so that it is doubtful whether 

 they are referable to Hyatt's genus or not. The two presented by Mr. 

 Robson are septate throughout, and the larger one " which is figured on 



