EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA I41 



interpretation of these faunas. It is not at present possible to say whether 

 the New York Oriskany species is of the same type. 



Dimensions. The onlyspecimen which we have observed having the 

 parts, together is in the Redpath Museum of McGill University. We owe 

 to Professor F. D. Adams the opportunity of studying this example. It 

 is from Grande Greve and has a length of 20 mm. Cranidia of other 

 specimens are of about the same size. 



Localities. At various outcrops on the upper horizons along the 

 Grande Greve coast. The same form is more abundant at the Perce 

 Rock. 



Species name. Charles Robin, organizer of the fishing industry in 

 Gaspe and founder of the Robin-Collas establishments, 1 766. 



Aparchites nov. 



Small, compressed convex valves of subcircular outline. The dorsal 

 edge straight and short (one third as long as the valve), the antero-dorsal 

 and postero-dorsal angles obliquely truncate ; anterior and posterior margins 

 equally rounded and forming a continuous curve with the frequently some- 

 what less rounded ventral margin. The valve is mostly uniformly convex 

 and the apex in the middle ; sometimes the area along the dorsal margin is 

 a little depressed and flatter than the rest of the valve. The lateral and 

 ventral margins show a narrow bevel. The surface is smooth when seen 

 with the naked eye, but' shows a very fine pitting when observed with a 

 strong lens. 



The genus Aparchites Is, stated by Ulrich to extend from the Lower 

 into the Upper Siluric. The present form appears to be more similar to the 

 type of the genus [A p . whiteavesi Jones Ann. & Mag.. Nat. Hist.. 6 

 sen, V. 3, 1889 from the Trenton, of Manitoba] than to the others, but i.t 

 differs from that species in its shorter dorsal line. 



Locality. Grande Greve. 



Bythocypris sp. nov. 



Plate 9, figures 17-ig 



Specimens are common of a Bythocypris closely related to B. cylin- 

 drica Hall of the upper Lower Siluric. The present form is very small, 

 .9-1 mm long, .3 mm wide; in outline identical with B. cylindrica as 

 figured by Ulrich [Pal. Minn. v. 3, pt 2, pi. 44, fig. 29-32], with which it 

 also sometimes agrees in size, while other specimens are slightly shorter and 

 rounder, and their anterior part less pointed. These differences in outline 

 w^ould, however, not be sufficient for specific distinction. The valves appear 

 also to be a little higher or more convex than those of B. cylindrica, 



