Prof. H. A. Nicholson — New Devonian Fossils. 117 



the railway cuttings north and south of Bray Head, up to a height 

 ofabout200 feet, there are shelly gravels interstratified with Olacialoid 

 drift ; portions of the latter drift being, apparently, in both places the 

 uppermost member in the section. In the co. Wexford, according 

 to the published geological maps, most of the country below the 260 

 feet contour line is occupied by shelly drifts; but in this area of shelly 

 drift are rocky tracts or exposures of "Eocky " and Boulder-clay drift, 

 while some of the land above the 250 feet contour line is also sur- 

 rounded by it. The shelly drift in general is more or less gravelly 

 on the south of these exposures, and to the north margin of the area ; 

 while marls and clays are found to the north of the exposures and in the 

 wide open spaces. Associated with these arenaceous and argillaceous 

 accumulations the Glacialoid drift occurs^ but mostly with the latter, 

 dovetailed into them or graduating into them, and in places over- 

 lying them. As this Glacialoid drift has previously been noticed;, it 

 is unnecessary here to repeat the description^ 



[To be concluded in our next Number.) 



IV. — Descbiptions of New Fossils from the Devonian 



Formation of Canada. 



By H. Alleyne Nicholson, M.D., D.Sc, F.R.S.E. ; 



Professor of Natural History in University College, Toronto. 



(PLATE VI.) 



{Continued from page 60.) 



Genus Productella, Hall. 



" Shells having the general form of Productus, but imiformly with 

 a narrow area on each valve, a foramen or callosity on the ventral 

 area, small teeth, and more or less distinct teeth-sockets. The reni- 

 form vascular impression, rising from between the anterior and 

 posterior occlusor muscular impressions, curves gently outwards, 

 and, following a curvature somewhat parallel with the margin of 

 the shell ■ to below the middle of its lengthy is abruptly re-curved, 

 and the extremity, turned a little backwards, terminates about half- 

 way between the margin and the anterior extremity of the mesial 

 septum. The cardinal process, seen from the inner side, is bilobed, 

 and from the exterior side each of these divisions is usually bilobed. 



"These shells differ from Strophalosia in the extremely narrow 

 linear cardinal area, greater extension of the hinge-line, more ex- 

 treme arcuation or ventricosity of the vental valve in many or most 

 of the species, and especially in the direction and termination of the 

 reniform vascular impressions, which resemble those of Aulosteges 

 and of some species of Productus. It differs from Productus in the 

 constant presence of an area, hinge-teeth, and sockets." (Hall, Pal. 

 N. Y. vol. iv. p. 153.) 



Productella is considered by Hall as a mere sub-genus of Producta; 



a considerable thickness of gravel. The base of this cliff is a huge kitchen-midden. 

 Consequently it could not be examined. Therefore I cannot say if the upper portion of 

 this section is typical Boulder-clay drift, or if the underlying gravels are similar to 

 the shelly gravels in the adjacent country to the south. 



