THE 
GEOLOGICAL MAGAZINE. 
NEW SEniiz=cwm. DECADE Il, VOES x 
No. IV.—APRIL, 18983. 
Opec seis eACte, |) AGEe ee eC ae aka ss 
I.—Nortes ow THE Devonian FisHes or CAMPBELLTOWN AND 
Scaumenac Bay In Canapa.—No. 2.! 
By R. H. Traquair, M.D., F.R.S., F.G.S8. 
R. DAMON of Weymouth having recently received a third con- 
signment of fossil fishes and Fish-remains from the Devonian 
Rocks of Canada, an interesting selection has been made for the 
Edinburgh Museum, and I am thus enabled to contribute some 
additional notes regarding the paleeozoic ichthyology of this region. 
The specimens were, as before, collected by Mr. Jex. 
Fisues From tue Lower Devonian oF CAMPBELLTOWN. 
Protodus Jeai, A. 8S. Woodward. 
Geou. Mae. Dec. IIT. Vol. 1X. 1892, pp. 1-2, Pl. I. Figs. 1, 1a. 
A great many specimens of this tooth have been last summer 
collected by Mr. Jex. That it is a selachian tooth is proved beyond 
doubt, not merely by its shape, but by its occasionally occurring in 
transverse bands, three or four being in apposition in a row back 
to front. 
Doliodus problematicus (A. §. Woodward). 
Diplodus problematicus, A. S, Woodward, op. cit. p. 2, Pl. I. Fig 2. 
Only a single specimen of this curious tooth was at Mr. Smith 
Woodward’s disposal, and that too only exhibiting the crown and 
denticles, being destitute of the root. The cusps certainly re- 
semble those of Diplodus in form and arrangement, but the peculiar 
form of the base, which is well shown in many of the specimens now 
before me, is very different, and necessitates the institution of a new 
genus, which, on account of the deceptive appearance of the first 
described example, I propose to name Doliodus.? 
Instead of the thick solid base of Diplodus we have here a broad 
thin plate, convex anteriorily and above, concave posteriorly and 
below, to the upper margin of which the crown is attached. The 
type specimen has only one intermediate cusp, but their number may 
vary from one to three or even four. 
In connection with the generic separation of this form of tooth 
from Diplodus, Ag., it is interesting to observe that although during 
his last visit to Canada, Mr. Jex obtained a large number of these 
teeth, not one example of a Pleuracanth spine has occurred in the 
1 For No. 1 see Gzor. Mac. Dec. III. Vol. VII. 1890, pp. 15-22. 
® Gr. AdAwos a deceiver. 
DECADE I1I.—vyOL. X.—NO, IV. 10 
