NO. 2225. NUCULITES FROM THE MAINE SILURIAN— WILLIAMS. 29 



In this paper are described the species Whitjieldella edmundsi, 

 CJionetes edmundsi, Chonetes cohscooki, BracJiyprion sJialeri, the new 

 genus Palaeopecten, and species P. cohscooki, P. danbyi (McCoy) 

 (sensu stricto Williams), P. transversalis, Pterinea (fTolmaia) tres- 

 cotti, Tolmaia campestris, Dalmanella lunata Sowerby was recognized 

 and figured. Chonetes hastini, CamarotoecJiia leightoni, Lingula scobina, 

 Lingula minima, var. americana, Actinopteria hella, A. fornicata, A. 

 dispar, Grammysia pemhroTcensis, Leiopteria rubra, Modiolopsis leigh- 

 toni, M. leightoni, var. quadrata, and Nuculites corrugata were des- 

 scribed and figured and the species Grammysia triangulata (Salter) 

 and Platyschisma helicites (Sowerby) were recognized and figured. 



X. Correlation problems suggested by a study of the Eastport 

 Quadrangle, Maine. Bull. Geol. Soc. Amer., vol. 24, 1913, pp. 377- 

 398. 



This paper announces the names adopted for the six divisions of 

 the rocks of the Eastport quadrangle, and gives a tentative correla- 

 tion of the formations with the divisions of the Silurian-Devonian 

 formations of New York State and England. 



XI. Eastport Folio Maine. U. S. Geological Survey, Folio No. 

 192, 1914, By Edwin S. Bastin and Henry S. Williams. Eight 

 plates, 16 to 23, contain 148 figures illustrating the faunas of the 

 Quoddy, Dennys, Edmunds, Pembroke, and Eastport formations, 

 and in the text lists of the faunas are given and their correlation 

 values discussed. 



XII. New Spirifers from the Silurian Formations of Washington 

 County, Maine. 



Spirifer trescotti. 

 Slirifer cohscoold. 

 Spirifer edmundsi. 

 Spirifer luhecensis. 



ON THE GENUS NUCULITES CONRAD, 1841. 



The original definition of the genus Nuculites Conrad, 1841, is as 

 follows : 



''Genus Nuculites. Equivalved; hinge with cardinal teeth as in 

 Nucula, hut apparently uninterrupted heneath the apex; an anterior rib 

 nice that ofSolecurtus, hut narrower, extends from the apex, either direct or 

 slightly oblique, toward the base, never passing much beyond the middle 

 of the valve." ^ 



TYPE-SPECIES OF THE GENUS. 



Nine species of ''Nuculites" were defined by Conrad in the same 

 paper with the definition of the genus (p. 50). 



Of these, the first, N. lamellosa, was not figured, and the specimen 

 appears to have been lost, as no further reference to it appears in the 

 literature. 



» Geol. Surv. New York, 5th Arm. Rept., 1841, p. 49. 



