NO. 1985. NEW SPECIES OF SILURTAN F08STLS— WILLIAMS. 349 



Brachyprion shaleri Williams. 



Fig. 10. — Mold of the interior of a pedicle valve, showing the short crenulated area 

 and smooth terminal portion of the hinge and the subquadrate form of the muscular 

 area bounded by strong subparallel ridges. 



Locality: West shore Cobscook River, opposite Wilbur Point, Edmunds Township 

 (loc. No. 8.21.1A). 



Cat. No. 58952. 



Fig. 11. — Exterior of a small pedicle valve showing the surface sculpture. 



Locality: Shore of the small bay west of Field Point, southeast of Balls Mountain, 

 Edmunds Township (loc. No. 8.1.8A). 



Cat. No. 58951. 



Fig. 12. — Mold of the interior of a brachial valve, showing the hinge crenulations, 

 the cardinal process, the dental sockets, and the strong ridges bounding the muscular 

 impression. 



Locality: East shore of Burnt Cove, south of Cunningham Mountain, Edmunds 

 Township (loc. No. 5.51.5B). 



Cat. No. 58950. 



Palseopecten cohscooH Williams. 



Fig. 13. — A nearly complete mold of the interior of a left valve, showing the erect 

 form, the characteristic radii, the pectenoid form, and the crural ridges. This speci- 

 men is the type of the new genus Palxopecten as well as of the new species P. cobscooki. 



Locality: East shore of Cobscook River, outside Carrying Place Cove on western 

 side of township of Trescott (loc. No. 5.52.9A). 



Cat. No. 58953. 



Pterinea {?Tolmaia) trescotti Williams. 



Fig. 14. — A specimen showing the interior of a right valve, its low umbonal region, 

 and concave toward the front. 



Locality: Near the end of Crow Neck on the east side of North Trescott (loc. No, 

 5.33.8A). 



Fig. 15. — A left valve, showing natural mold of the exterior with the strong radii, 

 trace of the cardinal teeth and lateral tooth, and well defined and developed anterior 

 ear. 



Locality: Same as figure 14. 



Cat. No. 58955. 



Tolmaia campestris Williams. 



Fig. 16. — A left valve, figured from a wax mold of the original specimen, showing 

 the reticulated surface sculpture covering the body and both ear and wing. 



Locality: Field Point on west shore of Cobscook River, Edmunds Township (loc. 

 No. 8.1.8D). 



Cat. No. 58956. 



Palseopecten transversalis Williams. 



Fig. 17. — Mold of the interior of a left valve, showing the transversely elongate form 

 the rays, and absence of a differentiated anterior ear. 

 Locality: East shore of Cobscook River, same locality as figtxre 13. 

 Fig. 18. — ^Mold of exterior of same specimen. 

 Cat. No. 58954. 



Plate 30. 



New species from the Pembroke formation of Washington County, Maine. 

 Figs. 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, enlarged 1^ diameters. 

 Figs. 17, 19, slightly enlarged. 

 Fig. 21, enlarged 2 diameters. 

 Fig. 18, enlarged 3 diameters. 

 Figs. 10, 14, 15, 16, 20, natural size. 



