a Family of Gra/ptolites. 25 



between the furcation -points are larger than in Dichograptus. Cen- 

 tral disc never present. 



There is some uncertainty about the species of this genus. Hall 

 discovered in a loose block in America a form with 16 branches, which 

 certainly helongs to this genus ( CI. Mile si, Hall) ; this is figured, but 

 not described, by Hall. Nicholson found in the Skiddaw Slates two 

 specimens of a form which must also be referred to this position. 

 They possess a great number of branches (C. multiplex, Nich.). In 

 the Norwegian PhyUograptus-sliale the author has found a consider- 

 able number of specimens agreeing in character with the above, and 

 especially with Nicholson's species, six of which have 8, and four 

 16 branches, while many others vary between 8 and 16 branches 



Fig. 9. 



Fig. 9. Clonograptus multiplex, Nicholson, Skiddaw slates, Peel-Wyke, Bassen- 

 thwaite, Cumberland. 



(Fig. 9). These were formerly identified by the author with C. 

 Milesi (Hall), but he now regards this identification as doubtful. 

 Nicholson's genus Temnograptus is not sufficiently distinct from 

 Clonograptus. 



1. Clonograptus Milesi, Hall. 



Graptolithus Milesi, Hall. 

 Temnograptus Milesi, Nich. 



2. Clonograptus multiplex (Nich.). (Fig. 9.) 



Dichograptus multiplex, Nich. 

 Temnograptus multiplex, Nich., Lapw. 

 Skiddaw Slates, N. England. 



3. Clonograptus flexilis (Hall), Nich., Lapw. 



Graptolithus Jlexiiis, Hall. 



Quebec Group, Canada. 



4. Clonograptus rigidus (Hall), Nich., Lapw. 



Graptolithus rigidus, Hall. 

 Graptolithus ab nor mis, Hall. 



Quebec Group, Canada ; Phyllograptus-shale, Norway. 



5. Clonograptus ramulus (Hall), Lapw. 



Graptolithus ramulus, Hall, Tornq. 

 Quebec Group, Canada ; Phyllograptus-shale, Dalecarlia. 

 Graptolithus Richardsoni, Hall, does not belong to this genus. 



6. Clonograptus tenellus (Linnars.) 



Dichograptus ? tenellus, Linnars., Lapw. 

 Triehograptus tenellus, Nich. 



OZe^ts-shale, West Gothland. 



