SUPER-ORDER III OSTRACODA 647 
transverse or longitudinal lines. Ordovician to Carboniferous; very profuse in 
Devonian. 
Entomidella, Jones. Like 
Entomis, but with furrow extending 
entirely across the valves to ventral 
edge. Cambrian to Silurian. 
Elpe, Barr. Shell reniform, 
3 mm. to 7 mm. long, with depres- 
sion just behind the middle of dorsal 
slope; posterior half sometimes 
strongly inflated. Delicate radial 
ornament. Ordovician and Silurian. 

Fia. 1351. 
A pe nae Fic. 1350 Entomis serrato-striata, Sandb. 
Family 8. Cypridinidae. Sars. ° ; sp. Upper Devonian; Weilburg, 
Entomis pelagica, Barr. Nassau. <A, Fragment of matrix, 
Shell ave Leeiianticell Lower Devonian (F); 1/;. B,Ventraland lateral aspects, 
Shells equivalve, sub-elluptical to Konieprus, Bohemia. 5/;. C, Impression of valve, 9/1. 
oblong, conver, smooth or punctate, 
and sometimes ribbed, especially in posterior half. Anterior end with a notch and hook- 
like hood overhanging an opening left between edges of valves for protrusion of the lower 
antennae ; posterior extremity frequently acuminate. 
Cypridina, Milne-Edw. (Fig. 1352). Shell generally acuminate, oviform, rarely 
oblong; antero-dorsal edge projecting beak-like over the strongly defined notch ; 
muscle spot large, sub-central, often visible on exterior. Ordovician to Recent. 
Cypridinella, J. K. and B. Like Cypridina, but having the antero-ventral region 
projecting somewhat prow-like and generally beyond the hook. Carboniferous. 

Fic. 1354. 
HUE SuEe Fic. 1353 Cyprella chrysalidea, de 
Cypridina primaeva, de Kon. Pee Kon. Carboniferous 
sp. Coal Measures; Braid- Cypridella Wrightii, J. K. B. Carbon- Limestone; Cork, Ite- 
wood, England. 4/; (after J. iferous Limestone; Cork, Ireland. 8/; (after land. 4/; (after J. K; 
K. and B.). J. K. and B.). and B.). 
Cyprideilina, J. K. and B. Differs from the last in having a tubercle or lump 
above the centre of the valve. Carboniferous. 
Cypridella, de Kon. (Fig. 1353). Like Cypridellina except that it has a curved 
sulcus behind the tubercle. Carboniferous. 
Cyprella, de Kon. (Fig. 1354). Shell much as in the last, but annulate. Carboni- 
ferous. 
Sulcuna, Rhombina, J. K. and B.; Cyprosis, Cyprosina, Jones. Palaeozoic. 
Family 9. HEntomoconchidae. 
Shell sub-globose, more or less tnequivalve; front edge truncate and with central 
portion of margin inturned so as to leave a simple or sinuate slit. Beak not developed. 
Entomoconchus, M‘Coy ; Offa, Jones, Kirkby and Brady. Carboniferous. 
Geological Range of the Ostracoda. 
Undoubted Ostracoda are first met with in the Upper Cambrian, and certain 
problematical remains indicate that they were initiated even earlier. Their post- 
