FEOM THE GULF OF GUINEA. 141 



Family CONCHCECID.E. 



Subfamily II A l o c Y p ii i N je, Daua. 



Geuus IIalocypris, Dana (1853). 

 Halocypbis brevirostuis, Dana. 



1853. Halocypris hrevirostr'ts, Dana, Crust. U.S. Expl. Exped. p. 1303, pi. xci. fig. 9, a-c. 



Habitat. From the following-, among other localities : — 



January .5th, lat. 5 58' 0" N., long. It' 10' 0" W., surface gatherings. 



The first of these gatherings was collected in Lhe evening after dark, the others during the 

 day. The specimens observed in any of the gatherings were comparatively few in number. 



Halocypris elongata, n. sp. (PL XV. figs. 1, 2, 27, 30.) 



Shell, seen from the side, elongate, anterior extremity rounded below the notch and 

 continuous with the ventral margin ; ventral and dorsal margins nearly straight, dorsal 

 produced posteriorly so as to be considerably longer than the ventral ; posterior margin 

 oblique, nearly straight, forming an acute angle at its junction with the dorsal edge; the 

 ventral angle obtusely rounded ; shell highest posteriorly, greatest height fully one third 

 of the length. Length 3' 2 mm. Seen from above, elongate ovate, widest at the middle, 

 width equal to rather less than one third of the length ; from the middle the shell tapers 

 and becomes much compressed towards the posterior extremity, which is somewhat 

 obtuse ; anteriorly the width decreases more gradually to the base of the rostrum, 

 whence the valves rapidly converge to the sharp pointed extremity of the beak ; surface of 

 the valves smooth. The setre of the anterior antenna; of the female are four short and one 

 long ; the second joint is s(jmewhat shorter than that which precedes or follows ; the last 

 joint is very short. The distal part of the tentacle seems to be continuous with the basal 

 portion instead of sagittifoi'm as in Halocypris atlaiitica, Lubbock. Natatory branch of 

 the posterior antennie slender ; secondary branch small ; first joint somewhat dilated and 

 furnislied with two small spines; apical joint small, bearing five setae — two very small, 

 two elongate and reaching to near the extremity of the apical seta^ of the primary branch, 

 and one about half as lung. 



Habitat. From several localities, among which arc the following : — 



January lOtli, lat. 3" 0' 8" N., long. 7' 13' 0" W., 50 fathoms (Station 9). 

 20th, „ 3 55' 3" N., „ 4^ 7' 3" E., 30 fathoms. 

 22nd, „ 1' 55' 5" X., „ 6' 55' 5" E., 20, 30, and 35 fathoms. 



February 5th, „ 4^ 20' 7" S., „ 10 1' 8" E., 20 and 30 fathoms (Station 23). 



This species was not observed in any surface toAV-net gathering. 



