walcott.] PALEONTOLOGY EASTERN MASSACHUSETTS. 89 



there and Paradoxides spinosus from Bohemia, and concludes that P. 

 harlani is a synony in for P. spinosus. 



In 1861 Prof. Jackson 1 exhibited a small trilobite from Brain tree of 

 the species Paradoxides harlani, stating that it seemed identical with 

 forms from Newfoundland described as Paradoxides bennetti from St. 

 Mary's Bay. In a foot-note accompanying a paper on the geology of 

 the vicinity of Boston, by Dr. T. S. Hunt, 2 the writer says: 



Mr. Billings informs me that he regards the Paradoxides bennettii (Salter) from 

 Newfoundland as identical with the Paradoxides harlani (Green) from Braintree. 



A number of collectors obtained specimens of Paradoxides harlani 

 from the Braintree beds, but it was not until 18G1 that a notice of other 

 species appeared. Mr. Albert Ordway 3 stated at a meeting of the Bos- 

 ton Society of Natural History that he had found a fragments a trilo- 

 bite which he referred to the genus Ellipsocephalus. He also reported 

 finding a distinct fucoidal impression which shows three branches, each 

 about 4 inches long, but not sufficiently well marked to afford any evi- 

 dence as to its nature. Mr. Ordway also published a figure of a head 

 of Paradoxides harlani when comparing that species with Paradoxides 

 spinosus, Boeck., considered by Barrande ideutical with P. harlani.* 



In his notes on the geology of eastern Massachusetts a Mr. W. W. 

 Dodge 5 reviews the then existing information in relation to the fauna 

 of the Paradoxides zone of Braintree — the Braintree slates— mentioning 

 Paradoxides harlani and a few obscure traces of fossils found at thatlo. 

 cality. A general description of the Cambrian fauna of Wales is given 

 in this connection. 



The second described species from the Paradoxides beds of Braintree 

 is Arionellns quadrangularis by Prof. II. P. Whitfield. 6 This is probably 

 the species of Ellipsocephalus referred to by Mr. Ordway. 



A review of the fauna of the Braintree argillites by Mr. O. D. Wal- 

 cott 7 included a mention of the species previously described, and a de- 

 scription of a new Pteropod, Hijolithes shaleri, and a new species of 

 trilobite, Ptychoparia rogersi. The species described by Prof. Whit- 

 field as Arionellus quadrangular is was referred to the genus Agraulos. 



Under the title of " Preliminary descriptions of North Attleborough 

 fossils" Messrs. N. S. Shaler and A. F. Foerste 8 made the most impor- 

 tant contribution to the Cambrian fauna of Massachusetts since the 

 discovery of Paradoxides harlani. They identified the fauna as that 



1 [On a trilobite from Braintree.] Boston Soc. Nat. Hist., vol. 8, 1801, p. 58. 



2 Boston Soc. Nat. Hist. Proc, vol. 14, 1871, p. 48. 



3 On the occurrence of other fossil forms at Braintree, Mass. Boston Soc. Nat. Hist. Proc, vol. 8, 

 1861, pp. 5, 6. 



4 Op.cit., p. 3. 



'Notes on the geology of eastern Massachusetts. Boston Soc. Nat. Hist. Proc, vol. 17, 1875, pp. 

 405-407. 



Notice of some new species of Primordial fossils in the collections of the Museum, and correction 

 of previously described species. Am. Mus. Nat. Hist., Bull , vol. 1, 1884, p. 147. 



7 On the Cambrian Faunas of North America ; preliminary studies. U. S. Geol. Surv. Bull. No. 10, 

 vol. 2, 1884, pp. 323-320. Separately paged, pp. 43-40. 



•Bull. Mus. Comp. Zool., Harv. College, vol. 16, 1888, pp. 27-30. 



