GRAPTOLITES OF NEW YORK. PART 2 



463 



Retiograptus geinitzianus Hall 



Plate 29, figures 5, 6 ; plate 31, figures 9-17 



Reteograptus geinitzianus Hall. Pal. N. Y. 1859. 3:518, figure 

 Retograptus barrandi Hall. X. Y. State Cab. Xat. Hist. 13th An. Rep't. 



i860. p.6r, figure 

 Clathrograptus geinitzianus Lapworth. Ann. & Mag. Nat. Hist. 



1880. 5:22 

 Retiograptus geinitzianus Walcott. 



Alb. Inst. Trans, v. 10, 1883. (Advance 



sheets. 1879. p. 35) 

 Retiograptus barrandei et R. gein- 

 itzianus Walcott. Geol. Soc. Am. Bui. 



1890. 1:339 

 Reteograptus geinitzianus Gurley. 



Jour. Geol. 1896. 4:80 

 Reteograptus ? geinitzianus Freeh. 



Leth. Pal. 1897. 1:608 

 Clathrograptus cf. geinitzianus T. 



S. Hall. Geol. Sur. X. S. Wales Rec. 1902. 



v. 7, pt 2, p. 7; pi. 14, fig. 5 

 Reteograptus geinitzianus Weller. 



Geol. Sur. N. J. Pal. 1902. 3:53 



To Hall this species was known only 

 as a fragment consisting- of three rows of 

 .hexagonal meshes [see text fig. 444]. Dr 

 Gurley obtained in the Normanskill shale 445 



, o. 1 • 1 • 1 1 Fig. 444-48 Retiograptus geinitzianus 



at btockport some material in particularly Haii: Fig. 444 c opy of Hail's original figure. 



Fig. 445-48 Gurley's manuscript drawings. Fig. 

 favnrablp nrpQprvafinn and tbprphv cur 445 Central (scalanform) view of rhabdosome (x 4). 

 iaVOraUie preser\ atlOn ailU LliereUy SUC- Fig _ 446 Specimen showing the apparent apertural 



spines. Fig, 447, 448 Sicular portions. Figure 445 



ceeded in making out the structure of the is enlarged x ^"figures 44610448,: 

 skeleton. He has published in 1896 a full account of his discover)-. We 

 have found still better material in our collection from Schodack Landing 

 N. Y. and Prof. Bishop's from Chatham, N. Y., which permits the elucida- 

 tion of points left unexplained by Gurley. To give the reader a full pre- 

 sentation of the complex structure of this form we have here inserted 

 besides Dr Gurley's published description his original drawings, heretofore 



