30 
DEVONIAN FAUNA. 
G. Hainense, Maurer,^ is distinguished by its larger umbo and more numerous 
triangular ribs, close growth-lines, and other features. 
7. CONOCAEDIUM PRATER, n. Sp. PL II, figS. 10, 10 a. 
Description. — Shell small, equi valve, moderately convex, suborbicular, higher 
than wide, with a short hind wing. Umbones direct, incurved, rather prominent, 
situate in front of the median line. Hinge-line long. Anterior margin 
first produced to form the rostrum, and then gently convex. Inferior margin 
rather narrow and roundly convex. Posterior margin straight and very oblique. 
Anterior cordiform slope small, very narrow and concave, passing imperceptibly 
into the median region. Anterior keel undeveloped. Median region rather 
narrow and very convex, bearing seven low rounded ribs, alternating with a 
still lower series of similar ribs, from which they are divided by linear furrows ; 
the whole crossed by very numerous, regular, close striae, which are convex 
toward the umbo on the higher series of ribs, and still more numerous and 
straight on the lower series. Posterior slope concave, bearing four or five almost 
linear ribs. Hind wing flattish, bearing about five flat, small, close ribs. 
Size. — Length 10 mm., breadth 10 mm., depth 7 mm. 
Locality. — There is a single specimen in my Collection from Lummaton. 
Bemarhs. — This little shell so closely resembles Conocardium Villmarense 
that it is doubtful whether it is more than a variety ; and this question is 
the more difficult to decide as I know only a single specimen. At the same 
time it distinctly differs in many of its details. It is decidedly less transverse ; 
its anterior side is less convex ; instead of having flat furrows it has a tendency 
to a second series of rounded ribs ; and its transverse ornament is much finer and 
of a different character. Under these circumstances I am inclined to treat it, 
for the present, as a distinct though very closely allied species, while fully realising 
that further evidence may show that it is only a variety of the last-named shell. 
^ 1885, Maurer, ' Abhand. Grossh. Hessisch. Geol. Landes.,' Band i, pt. 2, p. 229, pi. ix, 
figs. 21, 21 a. 
