112 ROYAL SOCIETY OF CANADA. 
but it would seem that Dr. C. A. White goes to the opposite extreme 
when he maintains that there are only two species in the Nanaimo 
group, viz., the form with divaricating plications which the writer for- 
merly referred to I. undulato-plicatus, and I. Vancouverensis. Thus, the 
species last named appears to be sufficiently distinct from J. subundatus, 
though the latter may be only a variety of the J. Crippsii of European 
authors, as suggested by Meek. 
In the collection now under consideration there are three specimens 
which are apparently referable to I. Vancouverensis. One of these is a 
very imperfect left valve labelled “No. 20, /noceramus undulato-plicatus, 
septarian clay (above lignite), Nanaimo River, Dr. Hector, 1860.” The 
umbo of this valve is not so tumid as is usual in this species, and the sur- 
face markings consist of low, distant, concentric undulations, but there 
are no indications of any radiating and divaricating folds. The other 
two are very small right valves from essentially the same locality, one 
labelled “No. 22, Inoceramus mytilopsis,’ and the other % [socardium.” 
Both have the prominent umbo characteristic of I, Vancouverensis, and 
the latter evidently corresponds to the latter part of the entry, ‘ Also 
Nautilus and Incardium” (a typographical error for /socardium), after No. 
29 in the list of specimens on page 243 of Captain Palliser’s report. 
The right valve from the Sucia Islands referred to Z. Sagensis, var. 
Nebrascensis, on page 172 of the second part of the first volume of 
“Mesozoic Fossils,” is a broad variety of I. Vancouverensis. 
INOCERAMUS SUBUNDATUS, Meek. 
Inoceramus subundatus, Meek. 1861. Proc. Ac. Nat. Sc. Philad., vol. xiii., p. 315. 
Inoceramus Whitneyi, Gabb. 1869. Geol. Surv. Calif., Palæont., vol. ii.. p. 193, 
pl. 32, fig. 91. 
Inoceramus Crippsii? var. subundatus, Meek. 1876. Bull. Geol. and Geogr. Surv. 
Terr., vol. ii., No. 4, p. 358, pl. 3, figs 1, la, and 3, 3a. 
Inoceramus Crippsii, var. proximus, Whiteaves. 1879. Geol. Surv. Canada, Mesoz., 
Foss., vol. i., pt. 2, p. 172. 
S ss var. Suciensis, Whiteaves. 1879. Jb., p. 173. 
ce ss var. Barabini, Whiteaves. 1879. Jb., p. 173. 
Four small slabs of argillaceous shale from the “ Nanaimo River,” 
four labelled “Stewart’s Bank,” and one “ Fossil or Pemberton Bank,” 
have upon one or both sides numerous small valves, which correspond 
very well with Meek’s illustrations of J. subundatus. These valves are all 
obliquely subovate in outline and a little longer than high. Their beaks. 
are very small and scarcely project above the hinge-line. The maximum 
length of the largest of these valves is very little more than an inch. 
