WHITEAVES.J DEVONIAN FOSSILS OP MANITOBA, ETf. 347 



LePEBDITIA (?) EXIGUA, Jellies. 



Lipinlitia(?) exif/ua, Jones. 1891. Coiitr. to Ganiul. .Micio-Pal:<_>ont., vol. I., pt. 3, 

 p. 94, pi. xii., fig. 10. 



East side of Lake Winnipegosis, on a small island east of the south end 

 of Birch Island, about four miles north-east of Wade Point, thirty miles 

 south of Long Point, J. B. Tyrrell, LSSi) : a single left valve. 



TRILOBITA. 



(S.) Bronteus Manitobensis. (N. Sp.) 



Plate 46, ixgs. 5, 6 and 7- 



This singular species is based upcjn very imperfect specimens of the 

 head of live different individuals, but as it is not quite certain that they 

 all belong to the same species, it is thought Ijest to describe each speci- 

 men separateh'. 



Specimen No. 1 (fig. 5), consists of the median p(jrtion of the head of 

 an unusually small individual, of which little more is preserved than the 

 glabella, with its long posterior median spine, and the postero-lateral 

 spine on each of the fixed cheeks. This specimen was collected by Mr. 

 Tyrrell, in 1889, on a small island north of Whiteaves Point, Dawson Bay, 

 Lake Winnipegosis, and may be characterized as follows. Glabella 

 moderately convex, inversely subconical in outline, broadest anteriorly 

 and narrowing gradually backward, shallowl)' sinuated at its margin (in 

 each side by the second or median pair of lati-ial glaliellar depressions, 

 then slightly expanded posteriorly and ultimately faintly constricted and 

 narrowing rather abruptly into a nearly sti'aight and veiy slender, median 

 and posterior, tubular spine, which is fully twice as long as the non- 

 spinose portion of the head, if not moi-e, and directed backward. 

 Although three pairs of glabellar furrows are obscurely indicated in speci- 

 mens Xos. 3, 4 and 5, by as many short lateral depressions or pits, only the 

 anterior and median pair can be detected in this specimen and the next. 

 On each side of the glabella, but just outside of it and commencing much 

 farther forward than the median posterior spine, there is a rather shorter, 

 stouter and more curved posterij-lateral spine, which is nearly parallel 

 with the median spine, and, like it, dircct(-d Ijaokward. The surface, 

 which is rather worn, is marked indistinctly with minute scattered 

 tubercles, which are too small to be seen without the aid of a lens. 



This is the only specimen in which the long and slender postero-median 

 and postero-lateral spines are preser\ ed. 



