302 Birge — Notes on Claclocera. 



Bunops,* gen. nov. 

 Plate XIII. Fig. 1. 



The head is very small and extends anteriorly much as in 

 Drepttnothrix. The forehead is flattened, somewhat kite- 

 shaped as seen from the front, and has a nearly hemispherical 

 elevation in the center behind which lies the eye. The valves 

 are nearly round, compressed, crested on the dorsal margin, 

 and extend posteriorly into a blunt semicircular projection, 

 Ventrally the valves gape in front and about the middle of the 

 ventral margin are folded in toward each other. This infolding 

 continues to the posterior end of the margin. Its effect is to 

 enable the posterior part of the valves to touch each other and 

 so close the branchial cavity behind. The free edge of the 

 valves is fringed in front with long, slender, straggling hairs, 

 while posteriorly they are short and closely set. At the pos- 

 terior portion of the shell these hairs are apparently above the 

 margin, owing to the fact that the infolded portion of the valve 

 extends dorsally as well as toward the median line. The shell 

 bears hexagonal reticulations, more distinct on the head and 

 in the ventral part of the valves. 



The post-abdomen is broad, compressed and rounded as seen 

 from the side. It is divided by a notch into a pre-anal and a 

 post-anal portion. The posterior, dorsal, margin of the pre-anal 

 part is convex and armed off the edge with 6-7 small recurved 

 teeth and on the sides with 2-3 rows of fine hairs. There is a 

 small but well marked abdominal process. The anal region 

 bears 2-3 small teeth on each side. The caudal claws are 

 curved, stout and denticulate and situated on a small conical 

 terminal projection. 



The antennules are long, slender and cylindrical, bearing an 

 anterior sense-hair, two pairs of posterior sense-hairs, and ter- 

 minal sense-hairs which number about 11 and are of equal length. 

 The antenna is of moderate length, slender and rather weak. 

 The setae are 3000-311. The basal seta is the longest but is 



* fiovvo?,, elevation and ojip, eye. 



