266 



NEW YORK STATE MUSEUM 



Of all the species of early Devonic age C. falklandicus, 

 Morris and Sharpe^ presents the closest similarity though of smaller 

 size and rather less subrectangular outline. One might with reason 

 regard the Aroostook species a varietal expression of C. falk- 

 landicus. This species has been recently identified in the Bok- 

 keveld beds of Cape Colony and figured by Reed^ and these figures 

 also show a narrower shell than that under discussion though at- 

 taining its full dimensions. 



Loiver Devonic. Edmunds Hill, Chapman Plantation, Me. 



Chonetes paucistria nov. 



This is a rare shell associated with the foregoing, distinguished 

 therefrom by the fewer and coarser striae, barely more than one 

 half the number in C. aroostookensis, increase therein aris- 



^mi\i 



t!; h o n e t e s paucistria 



ing from implantation near the margins. The outline also is not sub- 

 rectangular but subelliptical, the greatest width at the hinge and the 

 margins converging quite rapidly in a broad curve. These differ- 

 ences are expressed in our figures. 



Lower Devonic. Edmunds ITill, Chapman Plantation, Me. 



Chonetes billingsi nov. 



Chonetes laticosta (Hall) Billings. Palaeozoic Fossils. 1874. 

 V. 2, pt I, p. 20 



These shells are characterized by the high gibbosity of the cen- 

 tral region and abrupt slopes to the margins in the pedicle valve 

 and the coarse rounded ribs separated by interspaces of about the 

 same width. The ribs are usually simple, extending from beak 



^ Geol. Soc. Quar. Jotar. 1846. 2: 274, pi. 10, fig. 4. 



2 An. South African Mus. 1903. v. 4, pt 3, p. i6g, pi. 20, fig. 9, 10. 



