238 ' NEW YORK STATE MUSEUM 



Width on the hinge line from ten to sixteen lines. Length eight to fourteen lines. 

 Specimens two inches wide are sometimes met with. 



Mr Billings observed that the only reason he found for distinguishing 

 this shell from Leptostrophia perplana was the larger muscle scars. 

 Leptostrophia perplana as it occurs in the faunas of the Onon- 

 daga, Hamilton and Ithaca stages is seldom so large a shell at full growth 

 as L. b 1 a i n V i 1 li i, but the two are so closely similar in all details of 

 structure that I very much doubt the propriety of retaining a distinction in 

 name. This similarity is seen even in the minutiae of surface, interior and 

 hinge. Leptostrophia blainvillii is very abundant in the Gaspe 

 sandstone and very frequently its surface is covered by a growth of H e d- 

 erella blainvillii, which is seen very rarely indeed on any other 

 organism. 



Localities. Mr Billings gives his localities as the lower part of the 

 Gaspe sandstone at Gaspe. Our specimens show the species to be of 

 frequent occurrences in the outcrops of the Portage road, Gaspe Basin. 



Orthothetes (Schuchertella) becraftensis Clarke 



See under Grande Grfeve fauna, p. 199 



Not uncommon at Portage road, Gaspe. 



Chonetes billingsi nov. 



See tinder Grande Greve fauna, p. 209 



A single specimen from the Portage road. 



Chonetes hudsonicus Clarke 



Plate 45, figures 6-75 



Chonetes hudsonicus Clarke. N. Y. State Mus. Mem. 3. 1900. p. 49, pi. 7, 

 fig. 1-6 



In the work cited the writer referred to the fact that C h. hudsonicus, 

 found hitherto in New York only in the calcareous Oriskany of Becraft 

 mountain, occurs in the Gaspe sandstone. This species was described as 

 follows : 



The shell is of medium or small size, transverse in outline; hinge line marking the 

 greatest width of the shell; lateral margins subparallel for a short distance and rounding 

 rather abruptly to a nearly transverse anterior margin. Surface of the pedicle valve quite 

 uniformly convex, with a faint median sinus seen only over the anterior portion of the 

 valve. The surface striae are fine, round and close together, with very narrow interspaces. 

 They increase rapidly and irregularly by bifurcation and implantation. Very fine, con- 

 centric lines are sometimes visible with favorable preservation. The cardinal spines are 

 two or three in number on each side of the beak and are directed outward. 



