NO. 1985. NEW SPECIES OF SILURIAN FOSSILS— WILLIAMS. 337 



from Hisinger's species, which, he notes was originally described 

 under the name Pterinsea reticulata by Hisinger from the Upper 

 Silurian of Gotland. Freeh cites Lindstrom as reporting that the 

 Gotland form belongs to the genus Aviculopecten. 



If this be the case, M'Coy's name for the Pterinsea from the Brit- 

 ish Silurian referred to by Sowerby under Hisinger's name stands, 

 and the pterinoid form will be Pterinsea sowerhii M'Coy, while the 

 toothless Aviculopecten species will be Aviculopecten reticulata 

 Hisinger. 



FOSSILS OF THE PEMBROKE FORMATION. 



The name Pembroke formation was adopted for formation No. IV 

 briefly defined in my paper on the "Correlation of the Paleozoic 

 Faunas of the Eastport Quadrangle, Maine," to which reference has 

 already been made on page 320. In addition to the new species here 

 figured the following described species are inserted on the plates 

 and will reappear in the Eastport folio as illustrations of the fauna 

 of the Pembroke formation: viz. Dalmanella lunata (Sowerby), 

 Grammysia triangulata (Salter), Eurymyella shaleri var. minor 

 Williams, and Platyschisma Tielicites Sowerby. 



BRACHIOPODA. 



Genus DALMANELLA Hall and Clarke. 



DALMANELLA LUNATA (Sowerby). 



Plate 30, figs. 1, 2, 3, 4, 5, 8. 



1839. OrtMs lunata Sowerby, Sil. Syst., p. 611, pi. 5, fig. 15. 



1839. Orthis orbicularis Sowerby, Sil. Syst., p. 611, pi. 5, fig. 16. 



1869. Orthis lunata Sowerby, Davidson, Brit. Sil. Brae, p. 215, pi. 28, figs. 1-5. 



This is a common upper Ludlow species of Great Britain. 



Fornfiation and locality. — Pembroke formation, shales at head of 

 Leighton Cove, at southern end of the Pembroke peninsula, Washing- 

 ton County, Maine, loc. No. 5.3.8 M^ W, and F. 



Plesiotypes.—Csit. Nos. 58957, 58958, 58959, U.S.N.M. 



Genus CHONETES Fischer de Waldheim. 



CHONETES BASTINI, new species. 



Plate 30, figs. 6, 7, and 10. 



On passing upward from the Edmunds to the Pembroke formation 

 the CJionetes become very abundant, and in the latter formation show 

 a wide range of fluctuation in all their diagnostic characters. The 

 species to which I apply the specific name hastini is similar in form to 

 Chonetes striateUa Dalman, but differs in its finer and more numerous 

 80459°— Proc.N.M.vol.45— 13 ^22 



