DEVONIAN FAUNAS. 381 
angles to the hinge-line. Between this spine and the beak the bases 
of one or two additional spines may be detected. The characters of 
the shell are not well enough preserved to admit of its certain identi- 
fication, and in the great length of the outer cardinal spines it seems 
to differ from any of the described species of the genus from the 
horizon to which it belongs. 
CHONETES sp. undet. 
An occasional small, imperfect and more or less distorted specimen 
of Chonetes is met with in the Monroe shales of New Jersey, which 
resembles more or less closely some of the smaller Hamilton species of 
the genus in New York, but none of them are perfect enough for 
certain identification. 
CAMAROTOECHIA sp. undet. 
Occasional specimens of Rhynchonelloid shells occur in the Monroe 
shales of New Jersey, which doubtless represent some of the New 
York Hamilton species of Camarotechia, but none of the specimens 
ean be identified with certainty. From the locality north of the 
Clinton reservor a single specimen seems to possess the general form 
and proportions of C. sappho Hall, but the identification cannot be 
made with certainty because of the imperfection of the specimen. 
TROPIDOLEPTUS CARINATUS (Con.). 
Plate LYII., Fig. 2. 
186%. Tropidoleptus carinatus Hall, Pal. N. Y., vol. IV., p. 407, pl. 
62, figs. 2-3. 
Description——The New Jersey specimens of this species are all dis- 
torted and imperfect, but some of them retain characteristic features 
of the species. The shell is normally concavo-convex, but in nearly 
all cases the New Jersey specimens are crushed perfectly flat; the 
outline is subsemi-elliptical, with the straight hinge-line equaling, 
greater or less than, the width of the shell; the cardinal extremities 
are rounded or subangular; the lateral margins are straight or convex,. 
