376 G. J. HINDE ON ANNELID JAWS FROM 
graph on the Fossil Silurian Fishes, p. 72), which has, however, a 
much wider base. Length 3 line. Abundant. 
EUNICITES SIMPLEX, Hinde. (Pl. XIX. fig. 2.) 
Jaw consisting of a simple, slightly curved hook, narrow through- 
out, and angular in section. Length 14 line. 
EKUNICITES GRAcILIS, Hinde. (Pl. XIX. fig. 3.) 
Jaw composed of a nearly straight, slightly convex basal portion, 
with a strongly curved anterior hook. Length 1 line, about j line 
in width. 
Eunicires? prerratus, Hinde. (PI. XIX. fig. 13.) 
Jaw very small, triangular, and nearly equilateral. At one ex- 
tremity are two slender, elongated, nearly straight teeth, behind 
which, on the straight upper border, are seven minute rounded teeth. 
Length of the upper edge about 3 line. 
Genus (inonires, Hinde. 
Jaws with a more or less curved anterior hook, followed by a 
series of smaller teeth, similar in character to those of the existing 
genus Gnone. 
CENoNITES CURVIDENS, Hinde. (Pl. XVIII. fig. 7.) 
Jaw nearly straight, with a strongly convex ridge, forming the 
lower portion of the base; in front a relatively large, very strongly 
curved tooth, obliquely bent; this is succeeded by fourteen small 
pointed teeth, carried on a very narrow flattened ridge. Length 
? line, about 7 line in width. 
CENonITES In=QUALIS, Hinde. (PI. XVIII. fig. 8.) 
Jaw nearly straight, tapering to a point; a small projecting ap- 
pendage below the anterior part of the base, a slightly curved and 
blunted anterior tooth, succeeded by three minute blunted teeth, 
behind which are six or seyen larger acutely pointed teeth. Length 
1 line, width rather more than j line. 
CENONITES SERRATUS, Hinde. (Pl. XVIII. fig. 9.) 
Jaw elongated, narrow, the toothed border slightly arched, trun- 
cated at the posterior end, which is wider than the front portion of 
the jaw, and is slightly concave, with a narrow median furrow. The 
anterior tooth is but slightly curved, behind which are, first in order, 
four very small rounded teeth, and then a series of twelve very 
minute pointed teeth. Length 3 line. 
(inonrtzs RostRatus, Hinde. (Pl. XVIII. fig. 10.) 
Jaw relatively short, very wide and truncate; a deep furrow justi 
below the toothed edge, extending from the middle to the trun- 
cated extremity, and below the termination of the furrow is a pro- 
jecting knob-like elevation ; a stout curved tooth in front, behind 
