WHlTEWBsJ DEVONIAN FOSSILS OF MANITOBA, ETC. 349 



being quite different. The surface markings of the head of ' the present 

 species are more like those of the B. (jrinud((/nK of Goldfuss, as described 

 and figured by European and English writeis. 



( S.) LiCHAs (Terataspis). N. ,Sp. 



Plate J 6, fig. S. 



Portions of the marginal spines of the pygidium of a trilobite apparently 

 congeneric with the Teratnsjiis (jniiif/is nf Hall, were collected by jMr. 

 Dowling, in 1S89, un the west side of Dawson Bay, Lake Winnipegosis, 

 at the south end ot Rowan Island. These specimens, which are figured, 

 probably represent an undescribed species of Ttirntiiajns, which cannot yet 

 be properly chai-acterized for want of sufficient material. The species 

 indicated, howevei, was clearly of much smaller size than T.yrandix, and 

 the spinules on the spines of the pygidium cjf the former are feeble and 

 ramose, not stout and simple like those on the tail spines of T. ijnuidU. 



(S.) Cyphaspis bellula. (N. 8p.) 



Plate 40, figs. !) and 9a. 



Head strongly oon\ex and distinctly three-lobed, much broader than 

 long, rounded in front, nearly straight at the sides, but slightly cun- 

 stricteti posteriorly : genal angles produced backward into it paii- of 

 slender and nearly parallel or Vjut slightly di\ergent spines, which are 

 nearly as lung as the unai'med portion of the cephalic shield, as measured 

 along the median line. Border prominent but rather narrow, although 

 thickened by doublure, the test being very thin : marginal sulcus rather 

 broad but shallow. Facial suture intersecting the occijoital sulcus just 

 inside the genal angle, passing oliliiiuely and rather abruptly inward and 

 forward to the eyeJobe, thence rathei' more gradually outward and 

 forward to the anterior margin. Glabella occupying about one-third ot 

 the length nf the cephalic shield, as measui'cMl in the median line, convex, 

 prominent, egg-shaped, longer than Iji'oad, broadest anteriorly and 

 surrounded by a grcjdve, the basal portion of \\hich is formed by the 

 occipital sulcus : latero-basal lobes small, moderately prominent, egg- 

 shaped, a little longer than bioad and broadest behind. Eye-lobes more 

 prominent than the latero-basal loljes, their visual surface not preserved. 

 Cheeks strongly convex round each eye-lobe and sloping abruptly down- 

 ward to the lateral margin. Thorax and pygidium unknown. 



Surface ornamented with numerous and rather closely disposed but 

 distinct, minute rounded tubercles, which are obsolete upon the anterior 



