68 Ike dk, (Ge WIRILIE NZ. 
Didymograptus sagitticaulis Gurley, sp. nov. 
Grapiolithus saeditariusy (iiss) ElaillPallNeavien OA, s,m ane 2 mei 
Fig. 1; ‘“ Graptolithus sagittarius Hall (non-His.),” etc., of subse- 
quent writers; Didymograptus sagittarius Hall, Lapworth, 1886, 
@rans. Roy. Soc. Can, Vi;, Sect. IV, pp. 1s0—-181, 163-164" 
This name is proposed to clear the synonymy. No name has ever been 
given to this species, that under which it has gone being derived merely from 
the erroneous identification of it with Hisinger’s species. Very possibly the 
species is a distal fragment of one of the others in the same beds, but if so, it 
is so far distal that the chances of connecting it with the proximal portion are 
rather small, in the meantime it is important that it have a name in good 
standing, especially as, being a very common form, it occurs in nearly every 
list of species from the Lower Dicellograpsus zone, and usually appears 
under some clumsy explanatory circumlocution. 
Horizon and locality.—Lower Dicellograpsus zone. 
STEPHANOGRAPTUS GEINITZ, 1866. 
Neues Jahrb. fiir Mineral., 1866, p. 124. . Type, S. gvaczlzs (Hall). 
This generic name takes precedence of /felzcograptus Nicholson,* and 
Coenograptus Hall,? both of which were founded upon the same species (Grap- 
tolithus gractlis Hall). 
Stephanograptus crassicaulis Gurley, sp. nov. 
Specimen resembling one-half of S. gvacz?zs but with a much thicker main 
curved stem and branches, the former measuring from 0.50 to 0.75. in 
thickness, the latter inthe distal portions attaining a width of 1™™. The 
branches are given off from the main stem at first at a right angle, but with 
each succeeding branch the divergence becomes less. The thece on the 
distal portion of the branches measure 20 in 25™™. 
Horizon and locality.—Lower Dicellograpsus zone, Stockport, N. Y. 
This species differs from all other of the genus in its very stout polypary. 
Though only one-half of the polypary has been seen, the generic reference seems 
hardly open to doubt so much does the habit of the species resemble that of 
S. gracilis. 
Stephanograptus extlis Lapworth, sp. nov. 
Polypary bilaterally symmetric, consisting of two simple (or compound) 
monoprionidian branches about 40™™" long, diverging in opposite directions 
from the center of a minute radicular bar; branches bearing thece of type 
of those of S. evacz/is Hall. Width of branches at origin about o™™.17, pro- 
ceding outward at first horizontally (180°), the deflection increasing, however, 
t Ann. and Mag. Nat. Hist. 1868, IL., p. 23. 
2 Twentieth Rep. N. Y. St. Cab. Nat Hist., 1868, p. 179. 
