URAPTOLITES OF NEW YORK, PART 2 



I 9 I 



The rhabdosome when more complete than in the specimens hitherto 

 mentioned forms a dense mass of overlapping branches, which on account 

 of the frequent dichotomies and later reapproachments of the branches 

 assumes to some extent the aspect of a huge Desmograptus. 



We have been unable to see in any of our or Spencer's rhabdosomes 

 the central axis which he asserts to have observed in a number of speci- 

 mens, and we doubt, from the general structure of this form, that such a 

 thing as a central axis existed. 



Inocaulis divaricatus Hall 



I n o c a u 1 i s d 



Inocaulis d 



Inocaulis d 



Inocaulis d 



Inocaulis d 



varicatus Hall. Alb. Inst. Trans. 1879. 10:2. Abstract 

 varicatus Hall. Geol. Sur. Ind. nth Rep't. 1882. p. 225; pi. 1, fig. 3 

 varicatus Hall. Alb. Inst. Trans. 1883. 10:58 

 varicatus Spencer. Acad. Sci. St Louis. Trans. 1884. 4:565, 585 

 varicatus Spencer. Mus. Univ. State Mo. Bui. 1884. 1: 15, 35 

 Inocaulis divaricatus Gurley. Jour. Geol. 1896. 4:99,309 



This representative species of the genus Inocaulis in the Waldron shale 

 of Indiana is based on a fragment. From Hall's description and figure of 

 the same, which have not been added to by later investigations, it can be 

 inferred that I . divaricatus is nearly related to I . p 1 u m ulosus; 

 the large angle of divergence of the branches being the main difference. 

 As Hall's figure indicates, the '•' projecting imbricating scales "of I . 

 p 1 u m ulosus are also present in this species, notwithstanding the state- 

 ment to the contrary in the original description. 



Inocaulis flabellum (Miller & Dyer) James 



Licrophycus flabellum Miller & Dyer. Cin. Soc. Nat. Hist. Jour. 1878. 1:25; 



pi. 2, fig. 4 

 Inocaulis flabellum James. Cin. Soc. Nat. Hist. Jour. 1885. p.164; pi. 9, fig. 8 



This is no graptolite. 



acanthoqraptus Spencer 

 The genus Acanthograptus has been proposed by Spencer for two 

 forms from the Niaearan of Hamilton, Ontario. He sees its diagnostic 



