480 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Howell, B. F. 
1922. Oldhamia in the Lower Cambrian of Massachasetts. (Ab.stract.) 
Bull. Geol. Sec. Amer., vol. 33, p. 198-199. 
Raymond, P. E. 
1913. On the genera of the Eodiscidae. Ottawa Naturalist, vol. 27, p. 
101-106, text-fig. 1-16. 
(An almost complete specimen of Microdiscus? nobilis discovered at 
North Weymouth, and the new generic name Weymouthia proposed for 
it.) 
Sears, J. H. 
1905. The physical geography, geology, mineralogy and paleontology of 
Essex County, Massachusetts. 4to, Salem, Mass., 418 pp., illustr., map. 
(See p. 380-388.) 
Shimer, H. W. 
1907. An almost complete specimen of Strenuella strenua (BiUings) . Amer. 
Journ. Sci., ser. 4, vol. 23, p. 199-201, 3 text-figs. Addendum in same 
journal, page 319. 
1907a. A Lower-Middle Cambrian transition fauna from Braintree, Mass. 
Amer. Journ. Sci., ser. 4, vol. 24, p. 176-178, 1 text-fig. 
(From a single boulder from Braintree : 
Acrothele gamagei Hobbs M. Cambrian 
Hyohthes shaleri Walcott M. Cambrian 
Paradoxides harlani Green M. Cambrian 
Strenuella strenua (BiUings) L. Cambrian 
Olenellus {Holmia) broggeri Walcott L. Cambrian 
Ptychoparia rogersi Walcott M. Cambrian 
AgrauJos quadrangularis (Whitfield) M. Cambrian) 
Walcott, C. D. 
1887. Fauna of the "Upper Taconic" of Emmons, in Washington County, 
New York. Amer. Journ. Sci., ser. 3, vol. 34, p. 187-199, pi. 1. 
1910. On Olenellus and other genera of the Mesonacidae. Smithsonian 
Misc. Coll., vol. 53, no. 6, p. 231-422, pi. 23-44. 
(Olenellus broggeri Grabau and 0. broggeri Burr referred to Callavia 
crosbyi Walcott, p. 279. 
Olenellus sp. Burr and 0. sp. Grabau named Callavia burri Walcott, 
p. 280.) 
Middle Cambrian. 
(Grabau, 1898 and 1900, and Raymond, 1914, give exhaustive bibliogra- 
phies.) 
