SUB-ORDER B VERMES 
bo 
255 
Of peculiar interest are the minute detached jaws and toothed plates dis- 
covered by Hinde in the Ordovician, Silurian, Devonian, and Carboniferous 
rocks of Canada, Great Britain, and Sweden (Island of Gottland). These are 
A B C D 

Fic. 407. 
Palaeozoic Annelide-jaws. A, Lwmbriconereites basalis, Hinde. Silurian; Dundas, Ontario. 10/;. B, Oenonites 
rostratus, Hinde. Toronto. 1%/;. C, Ewnicites varians, Grinnell. Toronto. 6/;. D, Arabellites scutellatus, 
Hinde. Ordovician; Toronto. 16/;. 
very small, black, highly lustrous bodies, extremely variable in form (Fig. 
407), and mainly composed of chitinous material which is unaffected by acid. 
B 

Fic. 408. 
Conodonts, highly magnified. A, B, Paltodus truncatus, Pand. (after Pander). C, Prioniodus elegans, Pand. 
Cambrian; St. Petersburg. D, Polygnathus dubiws, Hinde. Devonian; North Evans, New York. 29/4. 
They exhibit a striking resemblance to the jaws of recent Annelides, and 
probably represent a large number of genera. 
Of less certain derivation are the microscopie teeth so well described by 
Pander under the name of 
“Conodonts” (Fig. 408), which 
occur detached in the Cambrian 
(Blue Clay underlying the Un- 
gulite Grit) of St. Petersburg, 
and are also very abundant in 
beds of Ordovician, Silurian, 
and Carboniferous age in 
Russia, Great Britain, the 
United States, and Canada. 
They are usually translucent, —_ Ty 
of a shiny, reddish horn-colour, \\\) | agar, i VAI i 
and are composed of carbonate “NV | ts Sil 
and phosphate of lime. They, 
too, exhibit great variety in Bre. 409: 
form. By Pander and others eee, Re, M‘Leay. Cambrian; Llampeter, Wales. 
these fossils have been re- 
garded as fish-teeth. Zittel and Rohon, however, consider that they are 
Annelid jaws, but their true position cannot yet be said to be satisfactorily 
determined. 
A quantity of supposed worm-borings, trails, impressions, and other 
= 
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