:iri4 CONTRTIUTIOXS TO CANADIAN PAL/EONTOLWi V. 



oiitei- sides much iiioie acute tliau tliose foinied hy the upper iuul inner and 

 MutPi- and lower, tliat fcjriiied by the upper and iiinei- side Ijeing not only 

 ohtuse hut rounded ott'. Lower and conicid portion oi the tooth 

 pronnnent, an^ulated and obtusely subearinate along the njedian line 

 abo\-e (tlie (jbtuse keel extending backward to, or rather rising abruptly 

 in and coiiiiiieneing at the centre of the ujipcf and expanded portion), 

 and flatteiu-d below, the outline (jf its transverse section })eing distinctly 

 triangular. 



Surface nearly smooth, though a slightly rougliened subtriangular area, 

 devoid of enamel, and probably representing the "root" of the tO(jth, is 

 bounded by the uppei- and outer sides of the expanded portion and by a 

 line which might be di'awn from the outer lateral margin a little above the 

 angle forme<l by the Icjwer and outer sides, to the njunded ofT angle at the 

 junction (jf the uppei- and inner sides, and i)assing just above the abrupt 

 commencement of the blunt keel which ultimately runs down the median 

 line of the cone of the crown. 



.Snake Island, Lake Winnipegosis, D. B. Dowling, L^S'.I : the specimen 

 tigure<l. 



This detached t(joth or dental plate is apparently homologous with one 

 of the l.-iige dental plates, which Dr. Newberry provisionally termed the 

 " pi-emaxillaries," in the centre of the upper jaw of Diiiic]it]iyi<. It is 

 doubtful, however, whether it represents the so-called " premaxillary " of 

 the right side, or that of the left. In the pi'eceding description, it has 

 been reg.-irded as the "premaxillary ' of the right side, l)ecau.se, in the 

 ccjrresponding dental plate of D. Tprri'Hi aiirj IJ. Ifcriwri, as lepresented 

 (liagrammatically by ].)r. Newbei'ry*, it is the outer- side of the upper 

 portion that is lateially expanded. If the specimen from Snake I.sland 

 should ])i'o\e to be the " prenia.xillaiy of the left side, the terms inner 

 and outer, in the preceding description of its characters, will of coui-sc 

 have to be i-eversed. In either e\ent, it is not at all likely to be con- 

 founded with the " |)renjaxilla.ry " of any of the described species of 

 bnnfhihijx. 



Ash'll>J('ITTllVS (?) NO'l-.Mill.LS. (N. Sp.) 

 I'lntc -17, H^s. 1 and 1 -a. 



The foregoing n;un(.' is suggested jirovisionally for a s)>ecin]e]i, which, as 

 suggested to the wiitei- by Prcjfessor Cojie, is ])roIiably the median j)late 

 of the \'enti'al shield of a large tish belonging to the family CorfiKilfulu-. 

 When eiitii'e, tins plate must ha\'e. Iieen eight inches or more in lengl,h 

 and at least seven inches in its ma.ximum bieadth. The specimen, which 



Mli'p. (ieol. Surv. Ohio, vcjl. II, pt. -2, Paln'ont., (tSV.",), j,].. 7 aiid .S. 



