G18 NEW YOKK STATE MUSEUM 



CLONOGRAPTUS Hall. 1873 



Clonograptus cf. flexilis Hall 



Graptolithus flexilis Hall. Gool. Sur. Can. Rep't for 1857. 1858. p.ll9 

 Graptolithus flexilis Hall. Canadian Organic Remains, decade 2. 1863. 

 p.l03, pl.lO, fig.3-9 



Only fragments of a form, not sufficient for definite determination, 

 but probably belonging to this species, have been collected by 

 T. N. Dale at a locality between Defreestville and West Sandlake, 

 Rensselaer co. N. Y. 



TEMNOGRAPTUS NlcholsOn 



Fragments of a very coarse and massive graptolite [pl.5, fig.15-20] 

 demonstrate the presence in the Deep kill beds of a single representative 

 of a peculiar group of raultiramous types of truly gigantic dimensions 

 when measured by the average graptolites. Some rhabdosomes of this 

 group of forms covered an area of 1 qm and more. The whole aggregation 

 which is typically represented by the genus Temnograptus, and to which, 

 besides, belong the genera Schizograptus, Trochograptus, Holograptus and 

 Rouvilligraptus, is characterized by the large size of the multiramous rhabdo- 

 somes, the mostly considerable thickness of the branches, the widely 

 and equally' separated points of branching and the strong development of 

 the lateral branching. All these features give to the group a uniform habit 

 quite distinct from that of the other graptolites. 



dichotomous branching as one of the distinctive characters of Temnograptus. That in 

 T. multiplex the branching is indeed raonopodial becomes evident in Nicholson's 

 and Elles's drawings, which show that one of the branches resulting from the 

 division follows the curvature of the mother branch, while the other alone assumes 

 a new direction. Only the branches of the first order divide dichotomously ; and it is 

 hence probable that no difference can be found between this and Holm's genus Trocho- 

 graptus, as according to Elles's table [p.478] the mode of branching constitutes the only 

 difference between the two. 



We believe, for these reasons, that Clonograptus milesi and Temno- 

 graptus multiplex belong to quite different series of the dichograptids. 



