270 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



Olcncllus (Olcnus) asaphoides (Emmons), Ford, 1871, American Journ. 

 Sci., 2d sen, Vol. 2, p. 23- (Gives name in list of species from rocks 

 at Troy, N. Y.) 



Olenellus (Olcnus) asaphoides (Emmons), Ford, 1871, Canadian Natu- 

 ralist, new ser., Vol. 6, p. 210. (Copj' of preceding reference.) 



Olenellus (Elliptocephalus) asaphoides (Emmons), Ford, 1877, American 

 Journ. Sci., 3d ser.. Vol. 13, pp. 265-272, pi. 4, figs. i-io. (Described 

 and discussed in detail, both young and adult specimens being illus- 

 trated.) 



Olenellus asaphoides (Emmons), Ford, 1878, American Journ. Sci., 3d ser., 

 Vol. 15, pp. 129-130. (Note on the development of the young and on 

 the generic relations of the species.) 



Olenellus asaphoides (Emmons), Foed, 1881, American Journ. Sci., 3d ser., 

 Vol. 22, pp. 250-259, figs. I, 2, and 3, p. 251. (Observations on the 

 generic relations and larval stages of the species. Figure 3 is an outline 

 drawing of the figure given by Ford [1877, pi. 4, fig. 5].) 



Olenellus asaphoides (Emmons), Walcott, 1884, Monogr. U. S. Geol. 

 Survey, Vol. 8, pp. 36-37, pi. 21, figs. 10, 11, and 12. (Young stages 

 of growth referred to. Figure 10 is an outline drawing based on Ford's 

 figure [1877, pl- 4. fig- 2b], and figures 11 and 12 are similar drawings 

 based on the cephalons of the figures given by Ford [1881, figs, i and 

 2, p 251].) 



Olenellus asaphoides (Emmons), Walcott, 1886, Bull. U. S. Geol. Survey, 

 No. 30, pp. 168-170, pi. 17, figs. 3-8 and 10; pi. 20, figs. 3, 3a-b; and pi 

 25, fig. 8. (Described and discussed. The specimen represented by 

 fig. 3, pi. 17, is redrawn in this paper, pi. 25, fig. 18 ; figures 5 and 6, pi. 

 17, are copied in this paper, pi. 25, figs. 9 and 10; fig. 7, pi. 17, is copied 

 from Ford, 1877, pi. 4, fig. 5; fig. 8, pi. 17, is copied from Ford, i88r, 

 fig. I, p. 251 ; figs. 3a-b, pi. 20, are copied from Walcott, 1884, pi. 21, 

 figs. 10, II, and 12, respectively; and fig. 8, pi. 25, is copied in this 

 paper pi. 24, fig. 10.) 



Olenellus asaphoides (Emmons), Holm, 1887, Geol. Foren. i Stockholm 

 Forhandl., Bd. 9, Hafte 7, p. 515. (Described in Swedish. The species 

 is frequently mentioned also in the discussion of " Olenellus kjerulii.") 



Elliptocephalus asaphoides (Emmons), M.\rcou, 1888, American Geologist, 

 Vol. 2, p. 12. (Discussed.) 



Ehcnczeria asaphoides Marcou, 1888, Mem. Boston Soc. Nat. Hist., Vol. 4, 

 p. 123. (Merely proposes the new generic name for the species because 

 of the close similarity between "Elliptocephalus" Emmons and EUip- 

 socephalus Zenker.) 



Olenellus asaphoides (Emmons), Lesley^ 1889, Geol. Survey Pennsyl- 

 vania, Report P4, Vol. 2, p. 489, 10 text figures. (Figures 3, 5, 6, 7. 8, 

 and 10 are copied without change in number from Walcott, 1886, pi. 17 ; 

 and figs. 3, 3a, and 3b are copied in the same manner from Walcott. 

 1886, pi. 20.) 



Olenellus (Mesonacis) asaphoides (Emmons), Walcott, 1890, Proc. U. S. 

 National Museum, Vol. 12, p. 41. (Mentions discovery of entire speci- 

 mens of the dorsal shield.) 



