EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA 23 I 



Grammysia canadensis Billings 



Plate 23, figure 13 



Grammysia canadensis Billings. Palaeozoic Fossils. 1874. v. 2, pt i, p. 51, 

 pl- 4, fig- 3 



Original description. Transversely subovate; posterior extremity obliquely truncated; 

 dorsal and ventral margins subparallel, slightly converging posteriorly; urabones mod- 

 erate, rounded, occupying about one third the hight; most projecting point of the anterior 

 extremity situated at about half the hight of tlie shell. The upper posterior angle is 

 obtusely rounded, about one fifth the length in front of the lower angle, which latter is 

 narrowly rounded or obtusely angular, and just above the line of the ventral margin. The 

 posterior edge, between these two angles, is gently convex, somewhat straight in the middle. 

 Dorsal margin, slightly arched, almost straight, gently curving over the posterior angle, 

 more abruptly rounded at the umbones. Ventral margin, nearly straight or slightly con- 

 cave in the posterior two thirds; the remainder, at first gently, and then somewhat abruptly 

 rounded up to the anterior angle, between which and the umbo there is a concave notch. 

 Length, about twice tlie hight; the greatest hight a little in front of the mid-length. The 

 valves are moderately convex, obliquely flattened from the umbones to the posterior half 

 of the ventral margin. A rounded ridge commences at the beaks, and runs obliquely 

 downwards and backwards towards the middle of the ventral margin, before reaching 

 which it becomes obsolete. On each side of this ridge there is a narrow sulcus. A mod- 

 erately strong rounded angulation extends from the beak, just below the dorsal margin, to 

 the lower posterior angle. The beaks appear to be small and closely incurved. 



Surface covered with concentric ridges from one half a line to two lines wide each. 

 On the umljones, and on the anterior half of the shell, these are rounded, but towards the 

 posterior extremity, they become flattened and sublamellose at their lower edges. 



Length of the largest specimen collected, thirty-three lines; hight, nineteen lines; 

 depth of a single valve, six lines. 



Locality. Gaspe; lower part of the Gaspe sandstone. 



This species has been found by me on the Gaspe Mountain and also 

 on the south side of the Southwest Arm, 3 miles from Gaspe Basin. It is 

 very closely allied to G. h a m i 1 1 o n i a e, a common shell in the sandy 

 Hamilton shales of central and eastern New York. 



Goniophora sp. ? 



A small well defined member of this genus occurs in the sandstone. 

 Locality. Portage road, Gaspe Basin. 



Modiella pygmaea (Conrad) 



Plate 23, figures 6, 7 



Pterinea py gm aea Conrad. Acad. Nat. Sci. Phila. Jour. 1842. 8:251, pl. 13, 



fig- 15 

 Modiella pygmaea Hall. Palaeontology of New York. 1885. v. 5, pt 1, 



p. 514, pl. 76, fig. 9-20 



The specimens of this species at Gaspe preserve all the characteristics 

 of typical forms, in size, contour and surface markings. The shell is com- 

 mon throughout the Hamilton shales of New York. 



Locality. Portage road, Gaspe Basin. 



