586 NEW YOUK STATE MUSEUM 



teri, figured here on plate 3, figure 15, appears to support this suggestion, 

 at least in regard to this species. 



The specimen just mentioned is further remarkable for its exhibiting a 

 distinct, flexuous nema and a sicula. Older individuals of this species 

 possess undoubtedly a robust main stem, from which the branches spring 

 and which terminates proximally in a spreading fibrous hydrorhiza, as it has 

 been found in the congeners of the species, notably C. elegans and 

 C. radicans/ 



Callograptus cf. dilTusus Hall 



Plate i, flgure 7 



Dendrograptus? (Callograptus?) diffusus Hall. Canadian Organic 



Kema^ns, decade 2. 1865. p.l32, pl.l8, fig. 1-3 

 Dendrograptus? diffusus Ilopkinson & Lapwortb. Quar. Jour. Geol. Soc. 



1875. 31:664, pl.36, fig.Ta, 7b 

 Callograptus diffusus Ruedemann. N. Y. State Paleontol. An. Rep't. 1902. 



p.570 



Description. There occur in the shale with Phyllograptu s 

 typus, at the base of the horizon with Didymograptus bifidus, 

 and in zone 3, branches of a dendroid graptolite which possess the 

 characteristics of Dendrograptus? (Callograptus?) diffusus 

 Hall, viz they are rather strong and rigid, frequently bifurcating and 

 slightly bending at the bifurcations, the resulting branchlets strongly diver- 

 ging. The thecal apertures, which number about 16 in 10 mm, are arranged 

 in one, somewhat tortuous series, on the flattened branch and circidar to oval 

 in outline. The thecae are not projecting. 



Position and localities. Rare in zones with Didymograptus 

 bifidus and Diplograptus dentatus at the Deep kill. 



' By Hopkinson, Ann. & Mag. Nat. Hist. ser. 4, 10:233, pl.lO. We have, therefore, 

 probably here the same conditions which have been observed by the writer to have 

 existed in Dictyonema flabelliforme [p.695], namely suspension by a thin 

 filiform nema in the earlier growth stages and fixation by a shorter stout stem in the later 

 stages. 



