CUSHMAN: VINEYARD SOUND OSTRACODA. 
367 
Aster ope oblong a Sars, ’87, p. 31, pi. 1, fig. 5-8; pi. 2, fig. 1, 2; pis. 5, 6. 
Cylindroleberis oblonga G. W. Muller, ’94, p. 219, pi. 4, fig. 14-18, 39, 41, 49- 
55; pi. 5, fig. 1, 4, 5, 13, 14, 33, 41-44; pi. 8, fig. 4. 
Specimens of this species were obtained on August 3, 1905, with 
Sarsiella zostericola. They appear to agree in all respects with Euro¬ 
pean specimens. In certain very minor characters the American 
specimens differ from the figures of Brady and Norman (’96) but 
there are certain discrepancies in their figures which may account 
for these small differences. 
No specimens of this species were seen in any of the dredged mate¬ 
rial, either from Vineyard Sound or from Buzzards Bay during the 
entire summer. Apparently in this region it lives near the surface 
as in the locality given. 
Length of shell of male 1.8 to 2 mm. 
TRIBE 2. PODOCOPA. 
Shell never possessing an antennal sinus; antennae simple, apex 
bearing sharp claws, and used for swimming or walking; maxilla 
with branchial plate bordered with ciliated setae; heart wanting. 
FAMILY CYPRIDAE. 
Shell usually without sculpture; antennulae 8-jointed, but by 
fusion appearing 7- or 6-jointed, usually with long slender setae; 
antennae 3- to 5-jointed; mandibles strong, apex strongly toothed; 
two pairs of feet, anterior pair strong, used for locomotion, posterior 
pair within the shell; caudal rami elongated, with two or three apical 
claws; copulatory organs symmetrical. 
Genus Pontocypris Sars. 
Pontocypris Sars, ’66, p. 13; Brady, ’68, p. 384; ’80, p. 35; Brady and Nor¬ 
man, ’89, p. 107; G. W. Midler, ’94, p. 246. 
Shell thin and fragile, higher in front than behind; antennulae 
7-jointed, setae longest on last joint, decreasing in length on preced¬ 
ing joints; antennae with four slender claws on the last joint, and 
