GRAPTOLITES OF NEW YORK. PART 1 649 



shown ill the numerous young specimens, which frequently become com- 

 pressed laterally. In this mode of preservation, in T. serra the four 

 branches diverge fully [pl.ll, fig.8] ; while in T. amii they coincide more 

 or less [pl.ll, fig.7]. 



From T . q u a d r i li r a o h i a t u s , which possesses the same horizontal 

 disposition of the branches, this species is readily distinguished by the rapid 

 widening of the branches. 



A feature still more distinctly developed in this species than in the 

 other congeners is the thickness of the dorsal wall of the coenosarcal 

 canal [p.552, pl.ll, f5g.5]. 



Tetrag^aptus fruticosus Hall sp. 



Plate 9, flares U-14 ; plate 10, figures 1-10 



Graptolithus fruticosus Hall. Geol. Sur. Can. Rep't for 1857. 1857. 



p.l28 

 Graptolithus fruticosus Billings. Geol. Sur. Can. Pal. Foss. 1865. 



1:366,375 

 Graptolithus fruticosus Hall. Canadian Organic Remains, decade 2. 1865. 



p.90, pl.5, %.6-8 

 Graptolithus fruticosus Hall. N. Y. State Cab. Nat. Hist. 20th An. Rep't. 



1867. pl.3, fig.15 

 Didymograptus? fruticosus Etheridge jr. Ann. and Mag. Nat. Hist. ser. 4. 



1874. 14:6, pl.3, iig.19 

 Graptolites (Didyniograpsus) fruticosus McCoy. Jour. Geol. Sur. 



Victoria. Prodr. Pal. Victoria, decade 1. 1874. p.l3, pl.l, fig 9-14 

 Tetragraptus fruticosus Lapworth. Ann. and Mag. Nat. Hist. ser. 6. 1880. 



6:20 

 Tetragraptus (Bryograptus?) fruticosus Brogger. Die sil. Etagen 2 



and 3, etc. 1882. p.39 

 Tetragraptus fruticosus TuUberg. Sver. Geol. Und. 1882. Afh. och 



upps. ser. C, no.60, p.22 

 Tetragraptus fruticosus Lapworth. Roy. Soc. Can. Proc. and Trans. 1886. 



p.l68 

 Tetragrapsus fruticosus Ami. Geol. Sur. Can. Rep't. ser. 2. 1889, v.3, 



pt2, p.liek 

 Tetragrapsus fruticosus Gurley. Jour. Geol. 1896. 4:295 



