Cycl. 



174 



Cyclopteris jacksoni, Dawson's Acadian Geology, 1868, p. 



.Vn/^"nc 



Cydopteris Jaclcsoni, 



516, f. 191 ; Canad. Nat. Vol. 6, p. 173, fig. 9, from Perry & St. 

 John; as in the Chemung- CatsMll strata about Montrose, Sus- 

 quehanna Co., Pa., as described by Hall. YIII-IX. 



Cyclopteris valida. See Appendix. 



Cydostoma pervetusta. See Pleurotomaria pervetusta, 

 ( al so Eiio mp ha lus perve tus tus. ) IV. 

 Cyphaspis christyi, (Hall, Trans. Alb. Inst. 1863, Vol. 



4.) Collett^s Indiana Rt. 1881, 

 page 333, plate 34, fig. 5, head 

 enlarged tivice ; fig. 6, entire 

 trilobite, enlarged twice ; fig. 7, 

 profile of same. Thorax (body) 

 has twelve segments, highly con- 

 vex, deeply lobed. Species dif- 

 fers from all others by its long 

 head, and proportions of body. 

 Hall. — Niagara formation. V b. 



1^ Cyperaceae seeds are fossilized in the peat bogs in which 

 the curious elastic black mineral dopplerite is found, as at 

 Scranton, Pa. (An. Rt. 1885, p. 649). At Zurich Prof. Heim 



