310 CONTRIBUTIONS TO CAXADIAN PAL.EONTOLOfiV. 



Iiawsoii Bay, Lake Winnipegosis, a mould of the exterioi' of a right 

 valve, from the Stringooephalus zone, and Devils Point, on the same lake, 

 a similar mould of a left valve (a gutta percha impression of which is 

 figured), from the basal beds of the Middle Devonian, both collected by 

 Mr. J. B. Tyrrell in 1889. 



The specimen from Dawson Bay, which is not figured, is essentially 

 similar in marginal outline to the C. planu/ataiis figured by Hall, but the 

 one from Devils Point is more squarely truncated posteriorly and may 

 not belong to the same species. Both differ from the typical form of C. 

 phi.nnlald in the much greater number and clo.ser disposition of their 

 " concentric undulations." 



(S.) Glossites Manitohensis. (Nom. pruv.) 



Plate 40, fig. 7. 



tShell of medium size, strongly but perhaps abnormally compressed at 

 the sides, elongate-subelliptical, a little more than twice as long as high, 

 and very inequilateral. Anterior side very short, its margin curving 

 rapidly and somewhat concavely downwai'd and forward from the beaks 

 to about the midheight, then abruptly backward into the Ijase below ; 

 postei'icjr side much longer than the anterior, its extremity \f;vy obliquely 

 subtruncated above, and produced as well as narrowl}' rounded below : 

 ventral margin nearly straight in the centre but curving gradually and 

 rather broadly upward at each end . cardinal margin nearly straight, 

 iKjrizontal and almost parallel with the ventral margin for nearly the 

 whcjle of its distance, behind tiie beaks : umljones compressed and de- 

 pressed : beaks curved inward and forward, placed very near to the aute- 

 lior end but not quite terminal. 



Surface marked apparently with rather numerous, somewhat irregularly 

 disposed, narrow and moderately prominent, rounded concentric plicati(jns. 

 Hinge dentition and muscular impressions unknown. 



Maximum length of the only specimen collected, forty-six millimetres: 

 greatest height of the same, twenty-one ram. 



Pentamerus Point, Lake Manitoba, J. B. Tyrrell and J. F. Whiteaves, 

 LSSS : a single imperfect specimen with both valves preser\ed. 



This shell has a considerable similarity, in external form, to the (llim- 

 niti'K /iiif/viilis of the Chemung Gr'oup of Pennsylvania, as figured by Hall 

 on Plate xcvi of the fii-st part of the fifth volume (Lamellibranchiata, 2) 

 of the Paheontology of the State of New York, but it may not e\en belong 

 to the same genus. Professor Hall places f,'/iissi/f's in the family J/ndio- 

 'iiiorplii.dll', but the general aspect of the present species suggests that it 

 is m(n-e likely to belong to the family Soli^iiojtsidn' of Neumayr and that 

 it is neai'ly related to /^(Uii/ttiuo/i !/'!<. 



