202 



CCELENTERATA. 



[PVC. — RHI. 



fulcratum, Hall, 1882, Foss. Corals Niagara 

 and Up. Held. Grs., p. 6, and 36th Rep. 

 N. Y. St. Mus. Nat. Hist., p. 410, Ni- 

 agara Gr. 



infundibilum, Meek, 1877, U. S. Geo. Sur. 

 40th Parallel, vol. 4, p. 28, Devonian. 



Ik;. 211 — Ptychophy Hum kmippl. 



knappi, Hall, 1883, 12th Rep. Geo. Ind., 



p. 278, Up. Held. Or. 

 stokesi, Edwards & Haime, 1851, Brit. 



Foss. Corals, p. lxix, Niagara «n. 

 striatum, Hall, 1882, Foss. Corals Niagara 

 and Up. Held. Grs., p. 22, and 35th 

 Rep. N. Y. St. Mus. Nat. Hist., p. 426, 

 Up. Held. Gr. 

 versiforme, Hall, 1882, Foss. Corals Ni- 

 agara and Up. Held. Grs., p. 22, and 

 35th Rep. N. Y. St. Mus. Nat. Hist., p. 

 426. Up. Held. Gr. 

 Pycnostylus, Whiteaves, 1884, Pal. Foss., 

 vol. 3, p. 2. [Ety. puknos, dense ; 

 stylos, column.] Corallum aggregate; 

 corallites slender, divided by calicular 

 gemmation, at distant intervals, into 

 sets of three or more ascending 

 flexuous branches; structure similar to 

 Amplexus, but tabula} horizontal and 

 not embracing. Type P. guelphensis. 

 elegans, Whiteaves, 1884, Pal. Foss., 



vol. 3, p. 4, 

 Guelph Gr. 

 g u e 1 p h e nsis, 

 White aves, 

 1884, Pal. 

 Foss., vol. 3, 

 p. 3, Guelph 

 Gr. 

 Quenstedtia, Ro- 

 minger, 1876, 

 Foss. Corals, 

 p. 71. Being 

 preoccupied , 

 Nicholson 

 proposed Romingeria. 

 niagarensis, see Romingeria niagarensis. 



'"C 



Fig. 212. — Pycnostylus 

 guelphensis ; two branches 

 are broken off at C, C. 



Rastkite8, Barrande, 1850, Graptolites de 

 Boheme, p. 64. [Sig. a rake.] Small, 

 almost linear, 

 very long, 

 stipe slightly 

 curved ; in- 

 terior canal 

 connecting 

 the cellules, 

 which are on 

 the convex 

 side and iso- _ 

 lutfvl frnm* fl °- 213. — Riisliites pere- 

 latea irom grin us. 



each other. 

 Type R. peregrinus. 

 barrandi, Hall, 1859, Pal. N. Y., vol. 3, p. 

 521, Hud. Riv. Gr. 

 Rbtiogkapti's. Hall, 1865, Dec. 2, Org. Rem., 

 p. 115. [Ety. rete, net; gmpho, I write.] 

 Frond simple or compound ; stipes 

 numerous arranged bilaterally on an 

 axis, elongate, oval or lanceolate with 

 longitudinal axis and reticulate struc- 

 ture ; margins with mucronate points. 

 Type R. tentaculatus. 

 barrandi, Hall, 1860, 13th Rep. N. Y. St. 



Mus. Nat. Him., |». til. Hud Uiv. Gr. 

 euchari8, Hall, 1865, Can. Org. Rem., Dec- 

 ade 2, p. 146, Utica Slate, 

 geinitzanns, Hall, 1859, Pal. N. Y., vol. 3, 



p. 518, Had. i:iv. Gr. 

 tentaculatus, Hall, 1858, (Graptottthai 

 tentaculatus,) Rep. of Prog, Can. Geo. 

 Sur., p. 134, and Dec. 2, Org. Rem., p. 

 116, Quebec Gr. 

 Retioutks, Barrande, 1850, Graptolites de 

 Boheme, p. 68. [Ety. rete, 

 net ; lithos, stone.] Stipes 

 thin, flat, elongate, triangu- 

 lar, composed of two series 

 of cellules symmetrically 

 arranged, in regard to the 

 axis ; orifices on the sides of 

 the triangle. Type R. gei- 

 nitzanus. 

 ensiformis, Hall, 1858, (Grap- 

 tolithus ensiformis,) Rep. of 

 Prog. Can. Geo. Sur., p. 133, 

 and Decade 2, Org. Rem., p. 

 114, Quebec Gr. 

 venosus, Hall, 1852, (Graptolithus veno- 

 sus,) Pal. N. Y., vol. 2, p. 40, Clinton Gr. 



R II I / cm. R APTUS, 



Spencer, 1878, 

 Can. Nat., 

 vol. 8, p. 460. 

 [Ety. rfriza, 

 root ; grapho, 

 I write.] Cy- 



Fio.2U-Ke 

 tiolites ve- 

 nosus. 



athiform, bi- 

 furcating 

 branches 

 with dichoto- 

 mous termi- 

 nations and 

 more or less F m. 215.— Rhizograptus bui- 

 reticulate; bosus 



stem terminating in a bulb. Type R. 

 bulbosus. 



