OLENELLUS AXD OTHER GENERA OF MESONACIDiE 2)2)7 



Eliptocephalxi,s {Paradoxides) asaphoides Emmons, i860, Idem, p. 280. 



(Note on the stratigraphic position of the species.) 

 Paradoxides ihompsoni (Hall), Emmons, i860. Idem, p. 280, note A. 



(Note on the stratigraphic position of the species.) 

 Paradoxides thompsoni (Hall), Barkande, 1861, Bull. Soc. Geol. de France. 



2d ser., Vol. 18, p. 276, pi. 5, fig. 6. (Translates into French the 



description given by Hall, 1859, p. 59. Figure 6 is copied from Hall's 



figure [1859, fig. I, p. 60].) 

 Paradoxides inacrocephahis Emmons, Barrande, 1861, Idem, pp. 276-277, 



pi. 5, fig. 7. (Discussed in French. Figure 7 is copied from Emmons, 



i860, fig. 70, p. 88.) 

 Not Paradoxides thompsoni Billings, 1861, Geol. Survey Canada, Paleozoic 



Fossils, p. II. (Referred in this paper to PcBdeumias transitans, see 



page 305.) 

 Barrandia thompsoni Hall, 1861, Report on the Geology of Vermont, Vol. 



1, pp. 369-370. (Copy of Hall, i860, pp. 115-116.) 



Barrandia thompsoni Hall, 1862, Report on the Geology of Vermont, Vol. 



2, pi. 13, fig. I. (Copied from Hall, i860, text figure, p. 116.) 

 Olenellus thompsoni Hall, 1862. Fifteenth Ann. Rept. New York State 



Cab. Nat. Hist., p. 114. (Generic name Olenellus proposed for this 

 species, Barrandia being preoccupied.) 



Not Olenellus thompsoni Billings, 1865, Geol. Survey Canada, Paleozoic 

 Fossils, Vol. I, p. II. (Reprinted from Billings, i86ia, p. 11, substi- 

 tuting Olenellus for Paradoxides, but the species is referred in this 

 paper to Pcedeumias transitans.) 



Olenellus thompsoni (Hall), Ford, 1881, American Journ. Sci., 3d ser., Vol. 



22, fig. 12,' p. 258. (Figure 12 is copied from Hall, i860, text figure on 

 page 116.) 



Not Olenellus thompsoni Whitfield, 1884, Bull. American Mus. Nat. Hist., 

 Vol. I, No. 5, pp. 151-153, pi. 15, fig. I. (Referred in this paper to 

 Pcedeumias transitans.) 



Olenellus thompsoni (Hall), Walcott (in part), 1886, Bull. U. S. Geol. 

 Survey No. 30, pp. 167-168, pi. 17, figs. 2, 4 and 9; pi. 22, fig. i, and pi. 



23, fig. I. (not fig. I, pi. 17 referred in this paper to Olenellus thompsoni 

 crassimarginatus). (Copies the original description given by Hall 

 [1859, p. 59] and discusses species. Figure 2, pi. 17, is redrawn in this 

 paper, pi. 34, fig. 9; fig. 9, pi. 17, is a restored drawing of the specimen 

 which is figured in this paper, pi. 35, fig. 4 ; and fig. i, pi. 23, is copied 

 with slight alterations in figure i of plate 35 of this paper.) 



Olenellus thompsoni (Hall), Holm, 1887, Geol. Foren. i Stockholm For- 

 handl., Bd. 9, Hafte 7, p. 514. (Described in Swedish. The species is 

 frequently mentioned also in the discussion of "Olenellus kjeriM.") 



Elliptocephala thompsoni (Hall), Miller, 1889, North American Geology 

 and Paleontology, p. 546, text fig. 1003. (Figure 1003 is copied from 

 Walcott, 1886, pi. 17, fig. 2.) 



Olenellus thompsoni, Lesley, 1889, Geol. Survey Pennsylvania, Rept. P4. 

 Vol. 2, p. 491, 3 text figures. (The large figure is copied from Walcott, 

 1886, pi. 22, fig. I ; figures 2 and 9 are copied from Walcott, 1886, pi 

 17, figs. 2 and 9.) 



