688 Beady and Noeman — Monograph of tlie Marine and FreshvHder\Ostracoda 



rostrum wide, and moderately curved ; sinus wide, and rather deep. The shell of 

 the male is somewhat smaller and narrower, posterior mai'gin almost rectangularly 

 truncate, posterior dorsal angle prominent. Sliell without any distinct sculpture, 

 but very faintly marked with curved striae. Length, 1'6 mm. (male); 1"8 mm. 

 (female). 



Capitulum of the frontal tentacle (fig. 6) in the male, destitute of hairs, 

 rounded at its apex, curved and bent angularly on the stem ; in the female 

 (fig. 12) almost straight, slightly clubbed, but produced into a sharp point at the 

 apex. Principal seta of the antennule of the male (fig. 7—7 «), bearing beyond 

 the middle a patch of about twenty pairs of reflexed spinules, of which the 

 proximal twelve are the longest, the distal seven or eight gradually decreasing in 

 length to the last ; tlie proximal sensory filament is about twice and a half as long 

 as the distal one. Hooked appendage of the secondary branch of the right male 

 antenna (fig. 8) angulated at the base, then bent abruptly, and forming a narrow 

 arch ; the three sensory filaments about half as long as the principal seta ; in the 

 female the principal setae (fig. 13) are about one-fourth longer than the others; 

 mamillary process of considerable size. Mandible-jDalp very stout, its proximal 

 joint in the male scarcely so long as the three-jointed terminate portion, the first 

 joint of which is as long or longer than the united lengths of the two following; 

 terminal curved seta very strong, and bent in a subsignioid fashion ; the gland- 

 vesicle extends through the three terminal joints : * biting-plate of the mandible 

 strongly toothed. Endojjodite of the foot-jaw scarcely two-thirds as long as that 

 of the first leg. The long anterior seta of the caudal lamina (fig. 10) reaches as 

 far as the tip of the first marginal claw ; the seven pairs of claws are stout and 

 moderately distant, one from the other. 



Procured by A. M. N., when at the Zoological Station, Naples, in 1887. 



Dr. Claus states that this species is widely distributed both at the surface and 

 in the depths of the Mediterranean and Atlantic. 



Some of the anatomical details given above are borrowed from Professor 

 Claus's description, our own specimens not having been sufficient to enable us to 

 verify them in every point. 



^ We have in no case been able to observe satisfactorily the curious glandular vesicles which are de- 

 scribed minutely by Drs. Claus and Miiller as existing beneath the shell and in other parts of the body of 

 almost all the Halocyprida. The prolonged preservation in alcoliol of all our specimens has no doubt 

 obliterated or obscm-ed these organs. 



