GKAPTOLITES OF NEW YORK, PART 1 627 



and all other multiramous dicliograptids known to the writer, in havini^ 

 these points close to the apical end of the long sicula. It has been noted 

 in the chapter on the phylogeny of the dichograptids [p.561] that this 

 is one of a number of characters which indicate a connection of this 

 species with a separate phylogenetic series of forms, ending in the coeno- 

 graptids. A form presumably derived from this species, described here as 

 Sigmagraptus praecursoi", 

 differs only in the formation of 



fwn inssi-pqfl nf fniir in'inpiml cjfpintj • ^i-- "^^ aoniopraptus perflexilis sp. nov. 



UW(.J lUbUtJtlU Oi iULll pilllOipctl feLtiLUb , BnlarRement of portion of branch of the specimen 

 - - ^ - PIT reproduced on plate 7, figure 7. Deep kill. x7 



and the development ot the lower 



left and upper right principal stems of Gr. perflexilis into nondividing 



branches would directly lead to that type. 



A peculiar feature of the largest specimen figured is a large, chitinous 

 body, suggesting a collapsed bag, adhering to the initial part of the rhabdo- 

 some [pi. 7, fig. 9]. Whether this distinctly outlined structureless body is the 

 remains jf a central disk or of an unknown parasitic growth, it is impossible 

 to decide by means of a single specimen. A central disk of the alate char- 

 acter observed in G . t h u r e a u i has not come to observation in this species. 



The specimen obtained from the beds at Mt Moreno [pi. 6, fig. 16], if 

 indeed belonging to this species, presents an extreme development of the 

 flexible or flaccid character of the branches of the species. It has there^ 

 fore been distinguished as mutatio jlaccida. The apertures of its hairlike 

 thecae are 2 . 5 mm apart and the thecae appear to be in contact not more 

 than one fourth of their length. 



Goniograptus geometricus sp. nov. 



Plate 7, figures 10-20 



Cf. Thamnograptus anna Hall. Geol. Sar. Can, Canadian Organic Remains, 



decades. 1865. p.l41, pl.21, fig.9 

 Goniograptus sp. nov. Riiedemann. N. Y. State Paleontol. An. Rep't. 1902. 



p. 566 



A sui'face of graptolite bed 3, belonging to the horizon with D i d y m o • 

 graptus bifid us, is entirely covered with the rhabdosomes of an 



