DENDROID GRAPTOLITES OF HAMILTON, ONTARIO. 



43 



Fig. 53. — Odontocadlis 

 GKA.NTi (Spencer). A 



UHABDO.SOME AND A 

 liRANCH OF SAME EX- 



LAucEL). ( After Spe.n'- 



rvAi. ) 



In spreading gently above in nndnlations tlie branches are more or less parallel 

 and situated closely together, and are connected occasionally with exceeding 

 fine transverse bars. The texture is corneous, with the 

 surface obliquely striated and marked witli ellipsoid pits, 

 which in some places indicate the orifices of the cells, of 

 which there were about two for every millimeter of 

 length of branch. The branches are rarely connected 

 by minute crossbars. 



The general outline is that of a regular oval form, 

 whose length, in the most perfect specimens, is 3 cm. (be- 

 sides the counnon stipe, which extends another centi- 

 meter), and breadth, 2 cm. The branches are not more 

 than a quarter of a millimeter broad, while the stipe is 

 about double that thickness. 



This exceedingly beautiful frond in general appear- 

 ance closely resembles C. salteri of the Quebec grouj) 

 but somewhat smaller, though there is some variation 

 in the size of this species. 



FoniHition and localitt/. — This species occurs on the shaly surfaces of the 

 Niagara dolomites at Hamilton, Ontario. 



Gurley's notes are as follows: 



(jf this species five specimens, certainly conspecific, were 

 seen. The one figured in text figure 54 differs slightly from 

 Spencer's figure in having the branches somewhat more 

 closely arranged, but in spite of this the identification seems 

 to me almost certain. This specimen has about 50-55 

 branches in 25 mm. of width. The branches are about 0.25 

 mm. wide. The dissepiments would seem to have been some- 

 what numerous; being very delicate, however, most of them 

 are covered or destroyed. 



One specimen in the Spencer collection shows the basal 

 stem and the proximal portion of the polypary. Dissepiments 

 are present. The basal stem bears two distinct thec:e at its 

 summit and obscure indications of them below. It is some- 

 what expanded at its lower end, appearing as though beginning to expand into 

 a "disk." C. fjranti then belongs to the Odontocaulis sec- 

 tion, whatever may ultimately prove to be the taxouomic 

 rank of that section. 



Horizon and locality. ~^Fi\e specimens : One in Spencer 

 collection, one in New York state collection, and three in 

 U. S. National INIuseum collection; all five from the Niag- 

 ara formation, Hamilton, Ontario. 



PJe'snjfj/pe.—Cut No. 55305, U.S.N.M. 



ODONTOCAULIS OBPYRIFORMIS Gurley, new species. 



This ne^y species is based on a single specimen in 

 the Spencer collection, and is described by Gurley 

 as follows : 



Fig. 54. — Odoxto- 

 caclis gkanti 

 (Spencer). Ax 

 incomplete 

 rhabdosojie. 



Fig. 55. — Odontocau- 



LI.S OBPi'RIFGRMISj 



xew specie. s. 

 View of the holo- 

 type showing 

 uhabdosome and 

 stem enlarged. 



Polypary pyriform. broad end distal, 22 mm. long by 15 

 mm. broad, arising from a thecate stem extending about 

 2.5 mm. below the meshwork and there broken off; bearing three thecse, intro- 

 verted somewhat as in the Dicranograptida?. Reticular portion of the polypary, 



