266 TRANSACTIONS OF THE [MAY 20, 
branches are respectively approximately 90°, 60°-70° and 40°— 
50°, but on the confert side 40°-50°, 40° and 30°-40°. On 
both sides branches are developed to the 5th order (or 6th if 
the funacle be counted as the primary branch). 
The funacle is short. The primary branches also are short 
(and the secondary as well on the patent side of the hydrosome). 
The ultimate branches are more numerous on the patent side, 
because on that side they more frequently reach the fifth order 
of division. 
The branches are slender, but rather rigid and the hydrotheca 
are widely spaced, there being about 8 in a space of 10 mm., 
and they are closely appressed to the branches. Apparently 
the mouth is at right angles to the body of the theca. 
Young hydrosomes show first the development of one direct 
extension of the hydrosome at each end of the funacle and ap- 
parently a branch on each side at each end, thus seemingly de- 
parting from the dichotomous order. But a closer examination 
shows that the apparent ternate branching of the funacle is due 
to the shortness of the branches: of the first order, which brings 
those of the second order, especially on the patent side of the 
hydrosome, in close approximation to the funacle. 
This interesting species is planly a Clonograptus, though it 
shows points of comparison with other genera. On the patent 
side of the hydrosome the shortness of the primary and second- 
ary branches recalls that of the typical Dichograpti, but from 
Dichograptus proper it is clearly distinct by the numerous 
branches in the distal parts of the hydrosome. In the slender 
branches and the distant cells it is like Clonograptus tenellus, 
and like the later Azygograptus and its allies. From C. tenellus 
it is clearly distinct by the short funacle and short primary and 
secondary branches. 
Dr. J. C. Moberg has described a graptolite from Hunneburg, 
Sweden (Bryograptus (2) sarmentosus), which by its abbre- 
viated primary and secondary branches resembles ours. It is 
from the same layers as Clonograptus tenellus. Dr. Moberg 
refers it with doubt to Bryograptus, and mentions that the 
branching of the large branches is like that of Clonograptus. 
It can only be thought a relative of our species if the supposed 
sicula be considered as a primary branch; in which case the 
mode of branching would be similar. 
In 1871 Dr. Linnarsson described a graptolite from the 
uppermost part of the Olenus Zone, which, like our species, was 
one of the early types of the genus Clonograptus Dichograptus 
tenellus.* He used for it the generic name Dichograptus, as at 
*Om nagra forsteningar fran Sveriges och Norges och “‘ Primordialzon”’ 6fversigt af 
Kongl. Vetenskaps-Akademiens Férhandlingar, 1871, No. 6, Stockholm. 
