382 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
joints slender; maxilla with the outer joint stout, bearing three short, 
stout spines on its inner margin. 
Habitat .— Specimens from Vineyard Sound, “Fish Hawk” station 
7723. Original specimens described from the Scilly Islands. 
PSEUDOCYTHERETTA gen. nOV. 
The essential characters of Pseudocytheretta are as follows: inner 
border of shell irregular with an S-shaped line as in Cytheretta but 
less prominent; a similar angle below the adductor muscle insertion, 
and likewise with the flat arch of Cytheretta; flagellum of the 
antenna 3-jointed; first foot of the male with a seta on the hinder 
border, left and right first feet of male greatly different, the last joint 
of the first foot of the right side being elongated and greatly broadened 
on the inner border, the extension thus formed equalling in length 
the sum of the two joints preceding. Type of genus, Pseudocytheretta 
edwardsi sp. nov. 
Muller’s description of the genus Cytheretta is here given in free 
translation: “ Genus near Cythereis, but differs from it in the following 
points. The inner border has a very irregular course, building on the 
anterior border a strong S-shaped line, on the ventral border below 
the adductor muscle insertion an angle reaching far downward, behind 
it an irregular, flat arch opening downward. It fails of entirely reach¬ 
ing the line of joining. Flagellum of the antenna in both sexes 3- 
jointed. First foot of the male on the hinder border without a seta, 
second foot of the male and female on the outer border with but one 
seta (besides the seta at the ‘knee’). Penis with long, free, copulatory 
tube.” 
Pseudocytheretta edwardsi sp. nov. 
PL 38, fig. 119-132. 
Shell with dorsal and ventral margins nearly parallel, anterior end 
produced somewhat below, posterior end more produced above giving 
an oblique appearance to the whole shell; both ends broadly rounded. 
Surface smooth with scattered hairs, ends slightly hairy. In a fresh 
condition the middle portion toward the sides and below is a clear 
chestnut brown with the rest of the shell a delicate pink. In old shells 
this color is lost by thickening of the shell substance. 
