Late Cenozoic Ostracodes — Holden 
19 
distribution: As fossils from T-12 (2 en- 
tire; 1 valve). 
discussion: In lateral view the species pos- 
sesses characteristics of the genus Paracypris 
but, though preservation is poor, it differs from 
that genus in the important feature of having 
a larger right valve. 
The species is placed in the genus Pro pont o- 
cypris primarily on the basis of general shape, 
but is placed there questionably because of its 
pronounced concave venter. 
Superfamily cytheracea Baird, 1850 
Family bythocytheridae Sars, 1926 
Genus Bythoceratina Hornibrook, 1952 
Bythoceratina monstruosa n. sp. 
Figs. 12 a-d 
diagnosis: Wide, ornate, massive alae, di- 
rected straight back and out at an angle of 30° 
without a terminal spine; pointed caudal pro- 
cess, grotesque anterodorsal tubercle; surface 
ornamentation of riblets. 
Fig. 12. Bythoceratina monstruosa n. sp. a-h, Holotype usnm 648740; a, side view of left valve; b, dorsal 
view of left valve, c, Paratype USNM 648742; internal view of left valve, d, Paratype usnm 648741; dorsal 
view of right valve. 
