234 BIOLOGICAL SUEA^EY OF 



Cytherinae 



Cythere 0. F. Miiller 



C. LUTEA 0. F. Miiller. (G. 0. Sars, 1925, p. 167, pi. 77.) 



Taken around the bases of algae in muddy situations, depths 



to 12 feet. This species is new to New England. Stations: 



D59; S4, 11. 



Leptocythere G. 0. Sars 



L. ANGUSTA Blake sp. nov. (Fig. 40.) Description of the 

 male. Taking the length of the shell as 100, the width is 33 

 and the height 43. In side view the valves are rather low 

 posteriorly, with the postdorsal angle quite prominent. The 

 posterior hinge tooth and its socket are located in this angle. 

 The surface is devoid of strong sculpture, being only orna- 

 mented by close-set polygonal pits. The dorsal view is almost 

 the same as that of L. castanea. The general color of the 

 animal is rather a dark chestnut, resembling the species just 

 mentioned. The male is about 0.72 mm. long. 



The first antenna is 5-segmented. The lengths of the seg- 

 ments (second segment taken as 10) are: 10, 10, 3.7, 5.3, 5. 

 Each segment is narrower than the preceding. The outer 

 surface of the basal segment bears a quadrant of fine hairs. 

 The second segment has two groups of fine hairs. The first 

 consists of about five long hairs at the end of the proximal 

 third of the outer margin. The other group is at the antero- 

 distal corner and the hairs are much shorter. The postero- 

 distal corner bears a spine as long as the two succeeding 

 segments of the appendage. The next segment has a clawlike 

 seta at the anterodistal corner, which seta is as long as the 

 third and fourth segments together. The fourth segment 

 bears two groups of setae, and, in addition, a single seta aris- 

 ing from the center of the medial face which extends to just 

 beyond the end of the segment. The first group referred to 

 above is at the middle of the anterior margin. The long claw 

 is about one-fifth longer than the combined length of segments 

 3 and 4. The short claw is as long as the third segment. Its 

 insertion is slightly proximal to that of the long claw. The 



