489 



OGYa. 



Ogygia serrata^ Rominger. Proc. Acad. N. S. Phil.. 1887, pi. 

 1, figs. 2, 2 a. See Olenoides nevadensis, Meek. Walcott, 

 in Amer. Jour. Sc. Sep. 1888, p. 165. — Middle Cambrian^ M, C. 



Olenellus. Genus discussed by Walcott. U. S. Geol. Sur. 

 Bull. 30, p. 162. Lower Cambrian, L. C, 



Olenellus asaphoides. Ford, (1871, Am. Journ. Sc. Vol. 



^ 2, p. 33 ; 1877, Vol 13, p. 267 ; 1878, Vol. 15, 

 ■™^ p. 129 ; 1881, Vol. 22, p. 250; Elliptocephala 

 asaphoides^ Emmons, 1844, Taconic System, 

 p. 21, figs. 1, 2, 3 ; Agriculture of N. Y., 1846, 

 Vol. 1, p. 65, figs. 1, 2, 3. Olenus asaphoides^ Hall, 1847, Pal. 

 N. Y., I, pi. 67, fig. ^ ato e ; Elhptocephalus asaphoides^ Em- 

 mons, 1849, Proc. A. A. A. S., I, p. 18 ; Amer. Geol. Vol. 1, 

 part 2, p. 114, figs. 1, 2, 3; pi. 1, fig. 18. Paradoxides asa- 

 phoides^ Emmons, 1860, Manual of Geol. p. 8, fig. 70, etc.) 

 Walcott, Bull. 30, U. S. G. S. p. 168, pi. 17, fig. 4, tail-spine 

 (telson) found with fragments of the animal at Troy ; fig. 5. 

 youngest stage of development yet found by W. only | mm 

 long ; fig. 6, a slighly larger specimen, 1.75 mm. ; fig. 7, adult 

 form (Ford); fig. 8, young form (Ford); fig. 10, chin piece 

 (hypostoma) supposed to belong to this species; pi. 30, fig. 3, 

 embryo, circular, etc., enlarged three and a half (Ford) ; fig. 

 3 a^ another phase, enlarged Ave times (Ford) ; fig. 3 5, normal 

 adult head piece, enlarged twice (Ford) ; pi. 25, fig. 8, enlarged 

 drawing of a piece of a free cheek.— Z. C Lower Cambrian 



