56 GUIDE TO LOCALITIES. 



1884. Whitfield, li. P. Notice of some neve species of Primordial fossils, 

 etc. (Am. Mus. Nat. Hist., Bull., vol. 1, p. 147.) Describes 

 Arionellus (=Agranlus) quadrangularis, from Braintree. 



1884. *WalcoU, G. D. On the Cambrian faunas of North America. (U. S. 

 Geol. Surv., Bull. 10, "Fauna of the Braintree argillites," pp. 

 43-49, pis. 7-9.) Describes locality and Hyolithes shaleri, Par- 

 adoxides harlani, Ptychoparia rogersi, and Agraulus quadrangu- 

 laris. 



1888. *Shaler, W. S. and Foerste, A. F. Preliminary description of North 



Attleborough fossils. (Mus. Comp. Zool., Bull., vol. 16, pp. 77- 

 91, pis. 1 and 2.) Describes twenty-one species from lower 

 Cambrian. 



1889. Foerste, Aug. F. Palaeontological horizon of the limestone at 



Nahant. (Bost. Soc. Nat. Hist., Proc, vol. 24, pp. 261-263.) 

 Announces discovery of Hyolithes incequilateralis Foerste (= H. 

 communis var. emmonsi Walcott) in limestone of Nahant, which 

 is Olenellus Cambrian. 



1890. Sears, J. H. The stratified rocks of Essex county. (Essex Inst., 



Bull., vol. 22, pp. 31-47.) Fossiliferous strata at Nahant, Row- 

 ley, Topsfleld and Jeffrey's ledge. All are lower Cambrian. 

 1893. Woodioorth, J. B. Note on the occurrence of erratic Cambrian 

 fossils in the Neocene gravels of the island of Martha's Vineyard. 

 (Am. Geol., vol. 9, pp. 243-247.) Olenellus Cambrian fossils in 

 pebbles derived from a conglomerate bed. 



1893. Walcott, C. D. Note on lower Cambrian fossils from Cohasset, 



Mass. (Biol. Soc. Wash., Proc, vol. 7, p. 155.) Mentions oc- 

 currence of Hyolithes communis and Straparollina remota in 

 boulder from Cohasset. 



1894. Woodworth, J. B. On traces of a fauna in the Cambridge slates. 



(Bost. Soc. Nat. Hist., Proc, vol. 26, pp. 125-126.) Trails similar 

 to those made by modern isopods, obtained from Maiden, Mystic 

 river, Clarendon hills. Monocraterion and pits like the borings 

 known as Arenicolites occur. Age not known. 



2. Dbvonic. 



1851. Hitchcock, E. On the geological age of the clay slates of the 

 Connecticut valley in Massachusetts and "Vermont. (Am. Assoc. 

 Adv. Sci., Proc, vol. 6, pp. 299-300.) A fossiliferous limestone 

 discovered at Bernardston, Mass., containing crinoid stems 

 which by Hall are referred to the lower Devonian (originally 

 described in 1835 in 2d edit. Geol. Mass.). 



1861. Hitchcock, C. E. (Rep. Geol. Vermont, p. 447.) Detailed descrip- 

 tion of the locality with correlation. 



1873. Dana, J. D. On rocks of the Helderberg era, in the valley of the 

 Connecticut, etc. (Am. Journ. Sci., 3d ser., vol. 6, pp. 339-352). 

 Discusses age of rocks and gives map of locality. 



