LVvew and Little Known American Paleozoic Ostracoda. IgI 
I am satisfied that Prof. Jones’ figure represents an imperfect 
example of the species here illustrated. As it is one of the com- 
monest in the ‘‘ Bryozoa bed”’ at the falls (the locality is in Clarke 
Co., Indiana) it might be expected to occur in the material sent to 
Prof. Jones from that locality. Comparing the figures it will be 
noticed that his specimen (a left valve) had a very narrow ante- 
rior end, with a slight concavity in the antero-ventral portion of 
the margin. The character of the marginal frill does not appear 
to have been recognized, though I have no doubt it is preserved in 
the posterior half of his specimen. As the frill bends inward at its 
edge, it might very easily be mistaken for the contact margin (Z. e. 
in specimens attached to foreign bodies or to the matrix). My 
figures represent internal and external views of two average right 
valves of the species. In neither of these is the small central 
node connected with the curved marginal ridge by a ‘‘ narrow 
neck.” Indeed, that condition is rare, and was not observed by 
me till I had seen Prof. Jones’ figure, when a re-examination 
revealed its presence in one out of every eight or ten specimens. 
The form of the long sub-marginal ridge suggests an alliance with 
the Lower Silurian species which I have called Desranella. (See 
plate 8.) 
Position and locality: Devonian Bryozoa bed, (? Hamilton 
group, ) Falls of the Ohio. 
MOOREA BICORNU1A, N. sp. 
Pate XVI, igs. 4 a, b, 6. 
Size: Length, 1.02 mm.; height, 0.6 mm.; thickness (of one 
valve), 0.25 mm. 
Valves suboblong, elliptical, rather strongly convex, with 
strongly rounded, nearly equal ends, the back straight in the 
middle two-fourths of the length; and the ventral edge gently con- 
vex. Near the anterior margin two conical prominences or blunt 
spines; at the opposite end of valve a prominent crescentic ridge 
curving parallel with the posterior margin. Margins of valves 
simple, without flattened borders. 
Closely related to AZ. kirkby?, lately described by Prof. Jones 
(Quart. Jour. Geol. Soc., Nov. 1890, p. 542) from the Cornifer- 
ous chest of New York. That species has a longer and straighter 
