66 CANADIAN FOSSILS. 
ce. Species consisting of eight simple stipes proceeding from a single 
axis, with or without a central disc. (Dichograptus, Salter, in 
part.) 
Plate. Figure. 
G. octobrachiatus ...... ah alate stevelaecinye naar (0. nic 1-7 
OCLODEACHIADNS ereretelelsistolale’-leies(si0\ ajeia ceva tarevete 1-4 
OCtONATIUS. wecceecsceccsssscecens Hoon) ago | 5 
d. Species consisting of more than eight simple stipes proceeding from 
a single axis, with a distinct broad corneous disc. (Dichograptus, 
Salter, in part.) 
Plate. Figure. 
GAO GANTT ereinte 0101+ «ics wlsieielei=,sivi cle cisleisisniviele 9 eeee 1-9 
DUO GAAS WEE leone bnlietes scabs cadniceiceeeRl, senaat t 
e. Species with the stipes proceeding from a single axis, and more or less 
frequently branched during their entire length; not known to 
have a central disc. 
Plate. Figure. 
(Cp aierallic) o6 cae ago booocdaDOdoS coonbn Gogo) GAsn » See 
TIPLAMS 1c vice sie veces enss sie neonoscdooaall Maga4 le 
BPNOLMS ee cine /a/eustere pongoDoce ponocosooodll aesr 6 
Richardsoni ..... nisfones stelslereletete tains Sodouc IPA h55 1-8 
TAMULUS «0. ceeeeee efalexeternreteratels(ejete eesceelZ coen 9,10 
B. Species (so far as known) CONSISTING OF SIMPLE STIPES WHICH ARE CELLULIF- 
EROUS ON TWO SIDES. 
a. Cellules tubular, inclined to the axis, aperture subquadrangular. 
Plate. Figure. 
G. (Diplograptus) pristiniformis......... 13 .... 15-17 
oe rhelty nba agin Sysinieicieverarats WSF iajers ee 
6. Cellules short and square, aperture transversely-elliptical, appar- 
ently excavated in the margin of the stipe. 
Genus CLIMAcogRapPtus, Hall. 
Plate. Figure. — 
OC PAnteNNATiWs c/s terece cre Aalalee eieletee vee nieins 13 eeee 11-13 
Genus Rerioiitss, Barrande. 
Plate. Figure. 
R. GNSILOPMIS Lek vinci aroisierctaels ars lave lola eis. b dia 14 eeee 1-5 
