GRAPTOLITES OF NEW YORK, PART 2 



W 



Dicellograptus sextans Lapworth. Ann. & Mag. Nat. Hist. Ser. 5. 1880. 6:19 

 Dicranograpt u s sextans Walcott. Alb. Inst. Trans, v. 10. 1883. (Advance 



sheet 1879. p. 34) 

 Dice llogr.aptus cf. s e x t an s Tullberg. Sver. Geol. Unders. Ser. C, no. 50. 1882. 



p.20 

 Dicellograptus sextans Lapworth. Roy. Soc. Can. Trans, v. 5, sec. 4. 1886. 



p.178 

 Dicellograptus sextans Ami. Can. Geol. Sur. Rep't. Ser. 2, v. 3, pt 2. 1889. 



P.117K 

 Dicellograptus sextans Walcott. Geol. Soc Am. Bui. 1890. 1:339 

 Dicellograptus sextans Gurley. Jour. Geol. 1896. 4:297 



Dicellograptus sextans ? T. S. Hall. Roy. Soc. Victoria. Proc. 1896. 9:184 

 Dicranograptus (Dicellograptus) sextans Roemer & Freeh. Lethaea Pal. 



1897. 1:621 

 Dicellograptus sextans T. S. Hall. Geol. Mag. n. s. Dec. 4, v. 6. 1899. p. 445 

 Dicellograptus sextans Ruedemann. N. Y. State Mus. Bui. 42. 1901. p. 539 

 Dicellograptus sextans Clark. Geol. Mag. Ser. 4. 1902. 9:498 

 Dicellograptus sextans Fearnsides. Section C. Belfast 1902. Separates, p. 1 

 Dicranograptus sextans Richardson. Terranes of Orange Co., Vt. 1902. p. 63 

 Dicellograptus sextans Elles & Wood. Monogr. Brit. Grapt. pt 4. 1904. p. 153; 



pi. 21, fig. ia-e 

 Dicellograptus sextans Dale. U. S. Geol. Sur. Bui. 



242. 1904. p. 33 

 Dicellograptus sextans Ami. Geol. Sur. Can. Sum. 



Rep't. 1905. p. 12 



Description. Branches of rhabdosome diverg- 

 ing at ^oo°, with acute axil ; straieht in shorter 

 specimens and gently curved in longer ones, some- 

 times with the ventral side as the concave one, 

 but more frequently with a convex ventral side 

 thereby approaching the shape of the handles of a 

 pair of pliers ; mostly about 10 mm long, rarely 

 surpassing 20 mm; usually of uniform width [see " Remarks"], which is .8 

 mm. Sicular extremity broad, slightly rounded, with short virgella and two 

 lateral spines. Sicula inconspicuous (.9 mm long). Nema short and thin. 

 Thecae numbering 11 to 13 in 10 mm, short (1 mm), overlapping one 



Fig. 229, 230 Dicellograptus 

 sextans (Hall). Fig. 229 Enlarge- 

 ment (x 5) of typical specimen. Fig. 

 230 Enlargement (x 5) of sicula with 

 first thecae 



