GUAPTOLITES OF NEW YORK, PART 1 645 



related to S i g m ag r a p t u s p r a e c u r s o r and Coenograptus, tliougli 

 not their progenitor, and, very probably, leading to certain flexuous forms of 

 Didymograptus. 



Tetragraptus quadribrachiatus Hall (sp.) 



Plate 11, figure 1-4 



Graptolitlius quadribrachiatus Hall. Geol. Sur. Can. Kep't for 1857. 



1858. p.l25 

 Tetragrapsus crucial is Salter. Quar. Jour. Geol. Soc. 1863. 19:137, 



fig.Sb 

 Graptolithus quadribracliiatus Hall. Canadian Organic Remains, decade 2. 



1865. p.91, pl.5, iig.1-5 ; pl.6, fig.5,6 

 Tetragrapsus quadribrachiatus Nicholson. Quar. Jour. Geol. Soc. 1868. 



24:131 

 Cf. Graptolites (Didymograpsus) quadribrachiatus McCoy. Jour. 



Geol. Sur. Victoria. Prodr. Pal. Victoria, decade 1. 1874. p.l5, pi. 2, 



hg.l 

 Non Tetragraptus quadribrachiatus Etheridge jr. Ann. and Mag. Nat. 



Hist. ser. 4. 1874. 14:3, pl.3, fig.5-8 

 Tetragrapsus quadribrachiatus Hopkinson & Lapworth. Quar. Jour. 



Geol. Soc. 1875. 31:649, pl.33, tig.9a, 9b 

 Tetragraptus quadribrachiatus Linnarsson. Sver. Geol. Und. 1879. Afh. 



och upps. ser. C, no.31, p. 5 

 Tetragraptus quadribrachiatus Brugger. Die sil. Etagen 2 and 3. 1882. 



p.38 

 Tetragraptus quadribrachiatus Tomquist. Sver. Geol. Und. 1883. 



Afh. och upps. ser. C, no. 57, p. 16 

 Tetragraptus quadribrachiatus Herrmann. Quar. Jour. Geol. Soc. 1886. 



ser. 3, 3:18 

 Tetragraptus quadribrachiatus Barrois. Ann. de la Soc. Geol. du Nord. 



1892. 20:95 



T e t r a g r a ]) t u s quadribrachiatus Matthew. Roy. Soc. Can. Trans, and Proc. 



1893. 11:114 



Tetragraptus quadribrachiatus Gurley. Jour. Geol. 1896. 4:295 

 Tetragraptus quadribrachiatus Roemer & Freeh. Lethaea palaeozoica. 



1897. 1:603 

 Tetragraptus quadribrachiatus Elles. Quar. Jour. Geol. Soc. 1898. 



54:485 



