374 G. J. HINDE ON ANNELID JAWS FROM 
wide distribution in time and space, that there were many species 
of them. The resemblance of many of the fossils to the recent forms 
is so striking that their respective relations may be seen at a glance ; 
but others vary considerably from all the descriptions of recent 
forms of jaws which have come under my notice, and their position 
remains doubtful. 
All the forms met with seem to belong to the mouth-apparatus 
of these animals. Though the chitinous setze are of as durable mate- 
rial as the jaws, they are, as a rule, much more slender, as well as 
smaller, consequently more hable to destruction; and I have not 
recognized any specimens which could be referred to these organs. 
After a careful comparison of these fossil jaws with recent ex- 
amples of the Order Annelida Polychta or Nereida, I find speci- 
mens belonging to the three families of Hwnicea, Grube; Lycoridea, 
Grube; and Glycerea, Grube. By far the larger proportion are 
included in the family Eunicea; and when the fossils resemble the 
jaws of the present generic divisions of this family, I have adopted 
the same term with the terminal addition of -ztes, followimg the 
example of Dr. Ehlers in this respect. Thus in this family there 
-are fossil jaws belonging to the genera Hunicites, Ehlers, Gnonites, 
gen. noy., Arabellites, gen. nov., Lwmbriconereites, Ehlers, and Stau- 
rocephalites, gen. noy. The only genus in the family Lycoridea 
represented as fossil is Nereidavus, Grinnell. Though I regard the 
specimens on which Mr. Grinnell founded this genus as belonging 
to another family, I yet retain it for forms which appear to resemble 
the jaws of the present Nereis. Out of a large collection I have 
only found a single example which could with probability be assigned 
to Nereidavus ; and it would thus appear that this important family 
was not proportionately so well represented in Paleeozoic times as at 
present. I place under Glycerites the simple forms of jaws which 
appear to correspond with those of the existing genus Glycera. 
I have thought it best to describe the fossil jaws from the different 
formations separately, and therefore begin with those from the lowest 
group, that of the Cincinnati or Hudson River. The specimens were 
all collected by myself from Toronto and its immediate vicinity. 
ANNELIDA POLYCH ATA. 
I. From the Oincinnati or Hudson-River Group at Torenio. 
Genus Evunicrrzs, Ehlers. 
Evnicires mayor, Hinde. (Pl, XVIII. fig. 1.) 
Jaw oblong, somewhat flattened, the upper edge curved inwards ; 
the posterior end truncated, with a deep furrow leading to an oval 
central depression, from which a cavity apparently extends under 
the front portion of the jaw; the furrow is bounded above and 
below by rounded ridges. At the front of the jaw are two stout 
blunted teeth, and the upper edge carries seyen or eight short, sub- 
equal, rounded teeth. 
