of the North Atlantic and of North-Western Europe. 695 



Paraconchoecia oblonga, Claus. 



1890. Paraconchoecia oblonga, . . Claus, " Die Gattungen und Arten der medi- 



terranen und atlantischen Halocypriden," 

 p. 13. 



1891. „ „ . . Claus, "Die Halocypriden des atlantischen 



Oceans und Mittelmeeres," p. 63, pi. viii., 

 figs. 10, 11 ; pi. ix. 



Shell elongated, with three or more teeth on the inner line of the anterior 

 margin, and a spinous process at the postero-dorsal angle of the right valve. The 

 shell of the male is twice, and of the female, twice and a-half as long as high. 

 Length, 1-4— 1"5 mm.; height, 0"6— 0*7 mm. Frontal tentacle broadly clubbed 

 at the extremity ; in the female angulated, and pointed at the apex ; in the male 

 rounded at apex, terminal portion aculeated on the margin. Terminal seta of the 

 male antennule much elongated, beset with numerous pairs of long, spine-like 

 hairs ; distal sensory seta rudimentary ; in the female the terminal seta is likewise 

 beset with spines, and is nearl}^ double as long as the four sensory setse. Hooked 

 appendage of the secondary branch of the right male antenna sharply bent, but 

 without any well-marked angle ; in the female the principal seta of the secondary 

 branch exceeds the four equal sense-organs by about half their length. 



In lat. 37° 45' N., long. 13° 38' W., and lat. 34° 18' N., long. 15° 34' W., 

 both at the surface and in the depths of the sea (Claus). 



Paraconclicecia spinifera, Claus. 



1890. Paraconchoecia spinifera, . Claus, " Die Grattungen und Arten der medi- 



terranen und atlantischen Halocypriden," 

 p. 14. 



1891. ,, „ . Claus, "Die Halocypriden des atlantischen 



Oceans und Mittelmeeres," p. 64, pi. x. 



Shell elongated, twice as long as high, very thin and delicate. Length, 

 1*8-2 mm. ; height, 0"85— 0-9 mm. The postero-dorsal angle of the right valve 

 bears two spines, one smaller than the other. Frontal tentacle long and slender, 

 its terminal portion short and stout, and beset with hairs on the ventral margin, 

 the apex produced into a hooked point ; in the male the tentacle is as in P. oblonga. 

 Terminal seta of the male antennule armed with a very large number of spines. 

 Hooked appendage of the secondary branch of the right antenna of the male 

 bent to an acute angle near the base ; in the female the four shorter setse of the 



5E 2 



