56 F 
KKWAX RIVKI{. 
Grimsby and Elora ; a spocim>m from Elora that the writer has 
referred to 0. Scammoni . and a specimen from L’Anse a la Barbe, 
near Port Daniel, in the Bale des Chaleurs, in the Museum of the 
Survey, labelletl 0. vivyatum^ by E. Billings. 
0. Cadmus, 0. subi'anc»’dlatii,m and 0, oi'us are names that have been 
given to this shell on the a-ssumption that Hall's Orthocents can. 
cdialnni is not the same as the OrlhoccvaliteH canccHatas of Elehwald. 
Billings, in a pa{)er entith'd “ New Species of Kos.sils from thH(Jlint<m 
and Niagara formations ” and published with his “ Catalogues of the 
Silurian Fo.ssils of the Island of Anticosti”, say.s tliat his 0. Cadmus 
appears to be 0. cancd/atum, Hall, not Eichwald. Atid in the 
e.xplanation of fig. 11, of Plate B) (10) of the Tweutit:th Be- 
gents’ lleport, Hall says that the character of the surface of 
impre.ssions of the e.xterioi- of specimens from Wisconsin and Illinuis 
that he ligures and refers to 0. anyuhituin and 0. viryatum, is 
“ precisely like that of 0. rnnc>'llatum, Hall, from the Niagara group 
of New York, and differs in no essential particular from the minute 
surface. m,arking.s of 0. cof umnarc.’' But Dr. Foord has shown that 
Eichwald's Ort/aireralifes caucdlatus is an Endoccras, ami the specilic 
name mncd/.ntnni does not appear to be preoccupied in Orlliocnras, 
and certainly is not in Kionoc^ras. And if it be objected that “once 
a synonym always a synonym ”, then the ne,\t .specific name to be 
s 'Iccted would seem to be A', or (0.) Scammuui, if Hall’s 0. cancdla- 
trim is not the same as the 0. camdiculalum of Sowerby. 
Orthocera’i, sp. indet. 
Apparently brevicone ; longitudinally ridged, ridges unequal in size 
and irrf.'gular in distribution. 
Ekwan river, portage road at falls : a fragment that is not sufli- 
ciently long to show conclusively whether it formed part of a brevicone 
orthoccratite or not. 
Orihoccras Adaraneimi, sp. nov. 
Shell increasing rather rapidly in thickne.ss, conq)ressed, elliptical in 
cross section ; surface ctf the test smooth ; septa very close together^ 
siphuncle apparently central, though the internal structure is badly 
preserved iti the only specimen collected. 
Ekwan river, portage road at falls; one specimen, a little over two 
inches in l(!ngth, and fully two inche.s in its longer diameter at the 
larger end. Perhaps a Kizoceras, which is possibly an inadvertent 
spelling of Jihizoceras. 
