1895. ] NEW YORK ACADEMY OF SCIENCES. 271 
Although we have not the initial part of the hydrosome of 
this species, it is referred to Bryograptus on account of the 
general arrangement of the branches; by comparing it with B. 
sptinosus the arrangement of the branches is seen to correspond 
to that of half of those of a hydrosome of that species ; it how- 
ever is a larger species and has larger thece. 
BRYOGRAPTUS (7?) RETROFLEXUS (?) Brogger. 
Die Silurischen Etagen 2 und 3, p. 37. PI. xii., fig. 22. 
Still another species of graptolite appears to be indicated by 
some fragments which are not branched,and appear to belong to 
a species with long branches such as the above. No sicula or 
primary branches have been recovered, and so the generic refer- 
ence is doubtful. There are about 10 thecz in the space of 10 
millimetres. 
Horizon and locality. Black shales of Div. 3b, at Navy Island, 
St. John Harbor, with Dictyonema. Scarce. 
A feature in Bryograptus which we see prevalent also in later 
. related types is the orientation of the cells on the branches on 
each side of the hydrosome toward the central line of the latter. 
Occasionally a branch from one side of the hydrosome will start 
off at a wide angle toward the other side; in this case the rule 
for the branches of this side is reversed, and the cells face to- 
ward the remainder of the branches of the side from which it 
sprang. This is obviously due to the attitude of such a branch 
diverging at a wide angle from the direction of its fellows; 
this divergence made it necessary that the position of its thecze 
should be reversed, in order that the mouths of the cells might 
be turned upward. 
CALLOGRAPTUS, Hall. Pl. XLVIII. fig. 5. 
A few obscure examples of a dendroid graptolite were obtained, 
which appear to be of Hall’s genus above named; the branching 
is not very well shown, but the lower branches appear to have been 
rather thick, and light cross-bars appear at intervals higher up, 
as though the branches were in some degree connected by trans- 
verse threads after the manner of Dictyonema. No cells were 
seen. 
Size. Length of the hydrosome about 12 mm. Width about 
10 mm. 
Horizon and locality. The Dictyonema beds (Div 3e) at Navy 
Island. Scarce. 
