New and Little Known American Paleozoic Ostracoda. 109 
lobe or ridge may be thickened, but this end of the carapace is 
never bulbous as in Ctenobolbina. Jones’ and Kirkby’s Beyrichz- 
opsis, including Carboniferous species, agrees more closely, but is 
distinguished by a peculiar round lobe on the anterior half. ey- 
richiella of the same authors, and likewise founded upon Carbonif- 
erous forms, resembles Pita more than Ctenobolbina. Prof. 
T. Rupert Jones, of England, who is beyond question the best 
authority on fossil Ostracoda, agrees with me in regarding this as 
a good generic group, distinguished from allied genera by the bul- 
bous character of the posterior end. 
CTENOBOLBINA CILIATA, VAR CURTA, DN. var. 
Hate VIL, Lig. 2. 
This variety differs from the typical form of the species (see 
Plate VII, Figs. 1 @ and 1 4) in being shorter, in having the pos- 
terior or principal furrow much narrower, and the central lobe 
produced above into a hollow, blunt spine. The flange or frill 
also is generally absent. 
Size: Length, 1.19 mm.; height, 0.82 mm. 
Position and locality: Found associated with C. alata, Ulr., in 
the lower shales of the Cincinnati Group, at Cincinnati, Ohio, 
about one hundred and fifty feet above the Ohio River. 
CTENOBOLBINA CILIATA, VAR EMACIATA, N. var. 
Tae VIN Les. 20,90, C. 
This is a strongly marked variety, differing from the more typi- 
cal phases of the species principally in the ventral obsolescence of 
the anterior lobe, the greater obliquity and prominence of the cen- 
tral lobe, and the emaciated appearance of the valve between this 
and the rounded posterior lobe. The posterior sulcus is deep and 
very wide, and divided above by a slight elevation at the dorsal 
border. The surface granulations are also more minute, and 
arranged in crowded series. The flange is wide and smooth 
except at the edge, where there is a row of small spines. 
Size: Length, 2.05 mm.; height, 1.24 mm. 
Position and locality: Cincinnati Group, at Savannah, IIl. 
