380 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
(pi. 36) shows the condition of these areas which have three or four 
rows of minute papillae from one of which springs the fine hair. 
These areas are more transparent than the rest of the shell. Besides 
these areas there are scattered papillae which are pigmented, most 
frequent near the ends and the dorsal border. They have a slightly 
swollen upper end when seen in side view. The ends of the shell 
have both a series of longer hairs at the border. 
The antennulae have two groups of hairs on the first and three on 
the second joint, the latter also has a short seta near the upper end of 
the outer margin besides the larger annulated seta at the lower end 
of the inner margin; the rays of the branchial plate of the maxilla 
are somewhat irregularly placed on the anterior border; the third 
foot has the terminal claw at least as long as the sum of the preceding 
two joints; basal joint of the first foot only with hairs; copulatory 
organ of the male with the basal portion divided into two parts, the 
upper of the two irregularly triangular, the lower portion broadened 
laterally; outer portion of the organ elongated, complex. 
Length of shell 1 mm. 
Habitat .— Found to be fairly common on sandy bottoms in Vine¬ 
yard Sound, “Fish Hawk” stations 7710, 7723. 
Cythereis vineyardensis sp. nov. 
PL 37, fig. 110-114. 
Shell, seen from the side, quadrangular, highest in front, greatest 
height about half the length; dorsal border nearly straight, with 
small irregularities, ventral border also nearly straight, somewhat 
sinuous, posterior evenly but slightly arched, anterior border rounded, 
produced slightly below the middle. Seen from above the shell is 
irregularly elongate, ovate, widest just behind the middle, width about 
two fifths of the length. Surface of the shell sculptured, ends with a 
series of bordering teeth and scattered hairs, whole surface of the shell 
except the borders raised, antero-ventral and dorsal borders of this 
raised portion with rounded projections; raised area obliquely trun¬ 
cated posteriorly; median line of the shell with a raised ridge on 
which are numerous projections, most numerous anteriorly. 
The last joint of the antennula with three long slender setae; first 
foot 2-jointed, outer joint very long, swollen in the middle, with a 
