334 G. J. HINDE ON ANNELID JAWS FROM 
GLYCERITES CALCEOLUS, Hinde. (Pl. XX. fig. 11.) 
Jaw somewhat triangular, gradually widening to the truncated 
posterior end; in front a broad, slightly curved, flattened hook; the 
central portion is depressed, concave, and passes into a hollow be- 
neath the hook. Length 2 line, width 3 line. 
This is closely allied to G. sulcatus, but is much smaller, and has 
a shorter and less curved hook and a greater central depression. 
Clinton formation. 
Ill. Annelid Jaws from the Hamilton Group of the 
Middle Devonian. 
My specimens from this formation have all been found in two or 
three small slabs of rocks exposed in the bed of the Riviére au Sable, 
Ontario. Judging from_the variety of the specimens it would appear 
that these animals must have been very numerous in this as well as 
in the lower.formations. One species, Arabellites similis, is present 
in this as well as in the Niagara formation, and some of the other 
_ forms are closely allied to those already described. 
Evunictres? ALVEOLATUS, Hinde. (Pl. XX. figs. 14, 15.) 
Jaw composed of a simple, nearly straight, depressed convex, 
hollow tube, bluntly pointed in front. Fig. 14 is 1 line in length 
and i line wide ; fig. 15 is only 3 line long and { line wide. 
I am doubtful whether these forms may be regarded as modified 
pincers, and place them provisionally under the above genus. 
Evnicrres tumipus, Hinde. (Pl. XX. fig. 16.) 
Jaw somewhat triangular in form and convex, the front nearly 
straight and extended downwards to a point, the posterior portion 
rounded ; on the nearly straight upper border are three or four 
blunted cusp-like teeth, with as many intermediate smaller ones. 
Length 3 line, nearly the same in width. 
Evnicrites patmatus, Hinde. (Pl. XX. fig. 17.) 
Jaw formed of a nearly flat, subquadrate plate, traversed longi- 
tudinally by a slightly elevated ridge, with a small spur-like termi- 
nation in the middle of the front side; on the upper border are six, 
relatively large, conical, upright teeth. Length 4 line, width 2 line. 
Eunicires wanvs, Hinde. (Pl. XX. fig. 18.) 
Jaw formed of a very minute, obliquely semioval, slightly convex 
plate, having on the upper edge a series of about ten very small 
pointed teeth, of which the first two are more prominent than the 
rest. Length 2 line, 3 line wide. 
Cinontres compactus, Hinde. (Pl. XX. fig. 18.) 
Jaw somewhat triangular, compressed, widest beneath the central 
portion, the lower border slightly elevated; a moderately stout, 
slightly curved hook in front, and on the gently arched upper 
