NORTH AMERICAN GRAPTOLITES 89 
two-thirds the width of the stem and are in the proportion of 25 to25™™. The 
aspect of the stem seems to oppose the view that the thecze project as in other 
genera form a coenosarcal canal. They appear rather to have been excavated 
out of the substance of the branch. 
PHYCOGRAPTUS GURLEY, gen. nov." 
Polypary consisting of long, slender, flexuous stems, apparently simple, 
with an entire border and many-segmented contents. Each segment with a 
single, central pit, seemingly the mouth of a cell, the latter apparently exca- 
vated in the substance of the stem. Sicula and virgula unknown. When 
preserved the substance is carbonaceous. Type ?. drachymera. 
This genus forms one of a group the relation of which to the more typical 
graptolites is at present somewhat dubious. They are all of a carbonaceous 
texture and some in addition show pits, apparently the mouth-openings of a 
cell of some kind, but there is at present no evidence that such cell is of the 
theca type found in the more typical graptolites. 
Phycograptus brachymera Gurley sp. nov. Plate V., Fig. 6. 
Greatest length observed, 175™"; width, 1™"; number of segment in 25™", 
about 18; each segment as long as, or little longer than wide (rarely one 
and one-half times as long); pit large. 
Horizon and locality.—Lower Dizcellograpsus zone, Stockport, N. Y. 
Phycograptus laevis (Hall). 
Graptolithus laevis Hall, 1847, Pal. N.Y., 1., p. 274, Plate LXXIV., Fig. 7; 
probably not 2d. Siiss, 1851, Haidinger’s Wissensch. Abhandl., IV., p. 
Bry Plates, Big. 
A careful examination of the type specimen shows that it is about 55™™ 
long,’ uniformly about o™".8 wide throughout. In one place a break occurs 
which, in the light of the other species, I incline to interpret as a segmenta- 
tion, especially as the adjacent ends appear smoothly cut. Obscure traces of 
a median virgula-like chitinous thread are visible at intervals; no pits could 
be made out with certainty. The specimen is a mere film much wrinkled. 
In another specimen I was able, however, to make out distinctly all the 
essential Phycograptus characters, viz., segmentation, pits, marginal grooves ; 
and, in addition, what appeared to be traces of a central chitinous virgula- 
like thread. 
Horizon and locality.—Utica shale, Turin, Lewis County, N. Y. Two 
specimens in American Museum of Natural History. 
Soc., London, 1855, XI., p. 475). As, however, the species has already been referred to, 
and is not preoccupied in 7hamnograptus, there is no reason why it should not stand. 
‘puKos, sea weed; ypadw, I write. 
2“Specimen uncovered after the figure made” (note on label). 
