CUSHMAN: VINEYARD SOUND OSTRACODA. 
383 
Antennulae with a long first joint, bearing a double cluster of hairs 
near the upper posterior margin and a smaller one on the outer end 
of the anterior margin, second joint large, swollen in the middle poste¬ 
riorly; on this broadest part a cluster of hairs, another cluster on the 
proximal end of the opposite margin. Flagellum of the second antenna 
3-jointed, the last joint the longest; first joint broadest at its outer 
end; third joint long; from the end of the second joint are two setae, 
one long, the other short. Mandible and maxilla as in Cytheretta. 
First joint of first feet broad, densely haired on the hinder border and 
with a large ciliated seta, densely haired; anterior border with four 
setae as in Cythereis. Left foot with the outer three joints and claw 
as in Cytheretta, right foot with the second joint shorter and broader 
than the left, third joint shorter and more than twice as broad as in 
the left, with two groups of bristles on the lower border of either side. 
Fourth joint very broad, front margin somewhat extended laterally, 
hinder portion extended distally to nearly four times the length of 
the rest of the joint and greatly broadened out, joint above the claw 
fringed with long hairs. Claw much shorter and very much broader 
than in the left and sharply acuminate. Second foot with a group 
of hairs near the seta of the hinder margin of the first joint and a 
seta near the middle of the side. Third foot also with a group of 
hairs near the seta of the hinder margin in the first joint; second 
joint with a group of very long hairs on the frontal margin and a 
group of shorter ones on the hinder margin. All the feet have a short 
spine at the end of the third joint. Copulatory organ of the male 
in the figure somewhat flattened, in its essentials similar to that of 
Cytheretta. 
Habitat .—- This species was first found in a dredge haul made by 
Mr. Vinal N. Edwards and the writer in 17 fathoms, sandy bottom, 
in Vineyard Sound, off Menimsha Bight, on July 13, 1905. Later 
it was found to be the most common Ostracod in the region; specimens 
were obtained in Buzzards Bay, “Phalarope” station 102, and in 
Vineyard Sound, “Fish Hawk” stations 7686, 7710, 7724, 7727, 7729. 
It seems to be confined to fairly deep water and as a rule to sandy 
bottoms. 
