CUSHMAN: VINEYARD SOUND OSTRACODA. 
379 
half the length, anterior extremity broad, well rounded, posterior 
much narrower, produced most above, dorsal margin nearly straight, 
ventral margin arcuate in front, slightly sinuate at about the middle, 
posteriorly rapidly rising to about three fourths the entire height of 
the shell; borders of the shell smooth, without teeth. Seen from 
below the outline is ovate, twice as long as broad, greatest width in 
front of the middle. Surface of the valves for the most part smooth, 
posterior border produced slightly to form a narrow flattened rim; 
ends with scattered hairs and the whole surface sparsely set with 
short hairs. Color pattern peculiar, consisting of a light band at 
either end and a large light area occupying the lower middle portion 
of the shell, this latter broken by bands of darker color which make 
up the rest of the shell. Below is a club-shaped area of very dark 
color, and the main part of the shell is made up of this darker color. 
Antennulae with two groups of long hairs on both the first and the 
second joints; mandibular palp of the type given by Muller for this 
genus; maxilla with a ciliated seta from the outer limb besides the 
usual setae. The lower border of the first joint of the first and second 
pairs of feet thickly set with long hairs, especially long and dense in 
the first pair. Feet similar on the two sides except that in the first 
two pairs the last three joints of the left feet are much stouter than 
those of the right feet. Terminal claws of all the feet with a swollen 
base and a very slender outer portion. 
Habitat .— Found but once, then living, in Buzzards Bay, “Phal- 
arope” station 129; apparently not common. 
Cythereis arenicola sp. nov. 
I 
PI. 36, fig. 97-107. 
Shell, seen from the side, quadrangular, of almost equal height 
throughout, slightly higher anteriorly, height one half the length, 
ends broadly rounded, anterior end produced slightly below; viewed 
from below, elongate-ovate, widest in front of the middle, width 
slightly less than half the length; from the inside the borders of the 
shell are seen to be thickened and the pore canals extend in through 
this border; there are also local thickenings in the upper portion of 
the shell below the hinge. Surface of the shell with scattered, irreg¬ 
ularly shaped areas, usually each with a single hair. Figure 100 
