On the Senonian Ammonite Fauna of Pondoland. 
125 
The genus 
Canadoceras, gen. nov. 
(genotype : A. newberryanus, Meek [Trans. Albany Inst., iv, 1857, p. 47, 
" Descr. and Illustr. Foss. Vancouver's and Sucia Islands, etc." ; Bull. U.S. 
Geol. and Geogr. Survey Terr., ii, 1876, p. 367, pi. iv, fig. 3], B.M. Geol. Soc. 
Coll., specimen figured Plate VII, fig. 5, Plate VIII, fig. 4), of the Upper Chico 
Formation, is allied to the Puzosid development Kitchinites, referred to 
below under Puzosinae, i.e. to the group of " Holcodiscus " pondicherryanus, 
Kossmat, which persists in the Campanian, together with the true Kossmati- 
ceras and its allies. A. newberryanus, Gabb non Meek * =" Pachydiscus " 
henleyensis, Anderson, is probably a Parapachy discus of the colligatus-gioup, 
though Anderson,! perhaps wrongly, puts it as of Lower Chico age, and 
confuses with " Pachydiscus " even Horsetown species of Pleuropachy discus 
{"Pachydiscus" sacramenticus) and of Desmoceras s.s. = Latidorsella, Jacob 
(" P." merriami). - ~ ( ~ 
A.fraternus, Meek, and A. suciensis, Gabb non Meek, J belong to Canado- 
ceras, as does a closely allied species in the British Museum. The true 
A. suciensis, Meek, or, at least, smooth Vancouver examples in the British 
Museum, are more doubtfully included here ; " Pachydiscus " neevesi, 
Whiteaves, is probably a Grossouvrites. 
Some of the more inflated forms, like C. multisulcatum, binodatum, 
and perplicatum, Whiteaves sp., though having inner whorls of the new- 
berry anus-type, resemble some forms of the other genera here separated ; 
e.g. there may be a tendency to acquire the oblique costation of Koss- 
maticeras, like K. pachy stoma, Kossmat sp., or of Kitchinites japonicus, 
n.n. = Desmoceras gaudama, Yokoyama non Forbes,§ testifying to the 
Puzosid ancestry of the pachydiscoid ' Kossmaticeras ' here named 
Canadoceras. 
The smoother Canadoceras of the suciensis-giouj) above mentioned 
resemble a somewhat parallel development, provisionally left in the genus 
Parapachy discus, and including slowly or quickly coiled (globose) forms, 
retaining the varices or constrictions of the Desmoceratid ancestors ; e.g. 
the Southern Patagonian P. hauthali, P. steinmanni, and P. patagonicus, 
Paulcke sp., probably also the Japanese ' Pachydiscus ' naumanni, Yokoyama. 
P. antecursor, v. Hoepen sp., and P. umtajunensis (Crick MS.), Spath, con- 
nect this group with the true Parapachy discus, and after a short hauthali- 
stage develop ornamentation foreshadowing that of the cnc&i-group of 
* Pal. Calif., i (1864), p. 61, pi. xxvii, figs. 199, 1996, c ; pi. xxviii, fig. 199a. 
t "Cret. Depos. Pacif. Coast," Proc. Calif. Acad. Sc. (3) Geol., ii, (1902), p. 104. 
{Wrongly quoted as A. suciaensis.) < 
t Loc. cit, ii (1869), p. 133, pi. xxi, figs. 11, 11a, b. 
§ " Verstein. a. d. Japan. Kreide," Pal., xxxvi (1890), p. 184, pi. xix, fig. 5. 
