of the North Atlantic and of North- Western JSurope. 703 



Shell marked with delicate, more or less distinct concentric lines, which are 

 Here and there arranged crosswise. Length about 1-8 mm.; height, 1-4 mm. 



Capitulum of the frontal tentacle long (fig. 15), subsigmoid in shape. Terminal 

 seta of the antennule nearly twice as long as the four sensory filaments. Basal joint 

 of the main branch of the antenna about twice and a-half as long as the apical, 

 short-jointed portion, which is provided with very long plumose swimming setae ; 

 principal seta of the secondary branch dilated and fusiform towards the apex, only 

 slightly longer than the neighbouring seta, which is about twice as long as the 

 remaining three equal setae. Hook of the secondary branch of the left male antenna 

 (fig. 16) broadly curved. Of the three terminal setae belonging to the first and 

 second maxillae, two are curved, and nearly equal in length, the third shorter and 

 more slender. Marginal spines of the caudal laminae (fig. 19) elongated, slender, 

 and slightly curved. 



A few specimens occurred in tow-net gatherings taken by the " Challenger" 

 expedition, but were not recognized nor described by Dr. Brady in his Monograph 

 of the Ostracoda. These were from the following stations: — Lat. 35° 18'N. ; 

 long. 147° 9'E.* ; and lat. 32° 41' N. ; long. 36° 6' W. ; lat. 35° 41' N. ; long. 157° 

 41' E. Dr. Glaus gives "Atlantic Ocean" merely as the habitat of this species, 

 and Dr. G. W. MuUer does not seem to be any more precise in his record. 



Though we do not doubt the identity of our specimens with Halocypris concha^ 

 Glaus, it should be noted, that the reticulated ornament of the shell is somewhat 

 more prononnced than that described by Dr. Glaus. Owing to paucity of material 

 we have had to adopt, for the most part. Dr. Glaus's description of the species. 



2. Halocypris pelagica, Glaus. 



1890. Halocypris pelagica, . . Glaus, " Die Gattungen und Arten der medi- 



terranen und atlantischen Halocypriden," 

 p. 25. 



1890. ,, duhia, . . Muller, G. W., " Ueber Halocypriden," Zoolo- 



gischen Jahrbiichern, vol. v., p. 269, pi. 

 xxviii., figs. 19, 23, 24, 30, 35 ; var. minor 

 {fide Glaus). 



1891. ,, „ . . Glaus, "Die Halocypriden des atlant. Oceans 



und Mittelmeeres," p. 78, pi. xxi., figs. 1—11. 



Length of shell, M-l-4mm. ; height, 0-9-1-1 mm. Frontal tentacle pro- 

 portionately thicker and shorter than in the preceding species, capitulum 



* It should be mentioned that the inscribed date on this gathering has become partially illegible, and 

 the locality may therefore be erroneous. 



6F2 



