PALMOZOIC ROCKS IN CANADA AND SCOTLAND. 377 
which are four claw-shaped teeth, followed by five rounded teeth, 
Length 2 line, width 2 line nearly. 
(EvonirEs cungatus, Hinde. (Pl. XVIII. fig. 11.) 
Jaw small, compressed, widest in the central portion and tapering 
gradually to the blunted extremity; a slightly curved anterior tooth, 
and on the nearly straight upper edge twelve subequal, very minute, 
rounded teeth. Length 4 line. 
Cinontres? cartwarus, Hinde. (Pl. XIX. fig. 19.) 
Jaw elongate, truncate posteriorly, the front portion slightly con- 
vex ; a very stout anterior tooth, and towards the end of the jaw five 
minute blunted teeth on an angular ridge; the central portion of 
the jaw beneath the ridge deeply concave. Length 3 line. 
Genus ARABELLITES, Hinde. 
I propose to include in this genus jaws of widely different form, 
which have a general resemblance to those of the existing genus 
Arabella, Grube. 1. Jaws with an extremely prominent anterior 
hook, and a row of smaller teeth on a wide base; 2. Sickle-shaped 
jaws and allied forms; 3. Jaws subquadrate in form, with a straight 
upper edge of small teeth. ‘Those of the first division appear to 
correspond with the first pair, the second resemble the second pair, 
as figured in Cuvier’s ‘Régne Animal,’ of Arabella (Gnone) macu- 
lata, Kdwards; whilst the square-shaped jaws I regard as belonging 
to the lower jaw of Annelids of this genus. Examples of these dif- 
ferent forms are very abundant, not only in the Cambro-Silurian, 
but in all the other formations where the Annelid remains appear. 
ARABELLITES HAMATUS, Hinde. (Pl. XVIII. fig. 12.) 
Jaw oblong, truncate, the wide base nearly of an even width 
throughout, a knob-like projection in the centre of the lower basal 
edge, and a similar one at the end; the anterior tooth relatively 
wide and openly curved. On the upper straight edge are ten sub- 
equal rounded teeth. Length 3 line. 
ARABELLITES corNutUS, Hinde. (Pl. XVIII. figs. 13, 14, 15.) 
Jaw relatively wide, truncate, the lower basal edge curved, with 
a more or less prominent knob-like elevation in the centre, which is 
the widest part of the base, the upper edge nearly straight, with a 
deep furrow just below the teeth extending from the middle to the 
posterior extremity, beneath which a rounded elevation is sometimes 
present. In front is an extremely large curved hook, and on the 
nearly straight upper edge is a series of small teeth, from eleven to 
twenty in number ; those towards the front are conical, whilst further 
back they gradually diminish in size and become rounded. Fig. 13 
is 1 line long and 2 line wide; fig. 14 is 13 line long and 3 line 
wide; and fig. 15 is 3 lines long and 1 line wide. 
