Pali jes

‘Genus Nitanoceras McLearn
The shells of this genus resemble closely thosé of Megaphyllites
Mojsisovics in form and suture line. The denticulations, however, do not

run up so far on the sides of the saddles; that is, the suture line is simpler.

Genus Isculites Mojsisovics
.This genus has been discussed in a previous paver (McLearn, 1937). ‘The
Peace River svecies Isculites schooleri from the Jathorstites feuna and,
appoarently also, Isculites ladinus Weltor from the Ladinian of Timor differ
chiefly from the species of the typical I. decrescens group ayene lack of
any Anatomites— or Juvavites-like ornament, and, from species like I. sub-—
descrescens, in the simoler suture line. I. schooleri is much older than

. either I. decrescens or I. subdecrescens, which are ef Norian age; is

probably not very close to.either of them, and, with I. ladinus, may require

a new generic name. | ites ;
Both Mojsisovics (1893) and Spath (1934) have included Isculites, in

“ake strict sense, thet is in the sense of Isculites decrescens Hauer, in

the Haloritidae and near Anatomites .

Genus Protrachyceras Mojaisovics
Gontemecneny use of the pene Protrachyceras encompasses a wide range
of form and penemedte No attempt is made to subdivide it into new genera
and it is ae @ broad sense, A brief history of “the genus from Anisian
to late Karnian is een aioe as a backeround against which to examine
the See from northeastern British Columbia,
A considerable number of species from Anisian to: late Ladinian time
fall Heke the catesory of compressed shells with. simple, unmodified tubercles.
Piey acy a ereat deal but are mostly moderately involute, compressed, have —
Oty rinedor averaze strensth, never fine, and the rows of lateral. tubercles
rer ee ses Pe Ale The tubercles do not become spinate, bullate or
evevatel The suture line is ceratitic to moderately ammonitic. These species

form what may be called the dunni group, and include the Anisian species

Protrachyceras Lahontanum Smith, P. americanum Smith, PB. dunni Smith,

P. springeri Smith, P. homfrayi Gabb from Nevada, the early Ladinian