700 Beady and Norman — Monograph of the Marine and Freshwater Ostracoda 



sensory filaments of the secondary branch of the antennae are very long, and the 

 mamillary prominence is large and tooth-like ; in the male the prehensile hook of 

 the right side is rectangularly bent at the base, and curved beyond ; on the left 

 side simply hooked ; the mamillary process slightly hooked. Teeth and general 

 armature of the mandibles (figs. 4, 5) strongly developed. The long posterior 

 seta of the caudal lamina is pectinated with short, fine cilia ; the seven marginal 

 ungues increase progressively in length from the first to the last, and are smooth 

 and somewhat widened at the base, pectinate beyond. Length of the shell 3 mm. 

 (female). 



Tow-net, " Triton" Expedition, lat. 60° 20' N., long. 7° 53' W., in 200 fathoms, 

 20th August, 1882, in the cold area of the Faroe channel (Dr. J. Murray). In 

 a depth of 1000 mfetres, lat. 34° 18' N. ; long. 15° 34' W. ; 500 metres, 

 lat. 32° 30' N. ; long. 16° 42' W. (Glaus). 



Dr. Glaus doubtfully identifies this species with Halocypris imbricata of the 

 " Ghallenger " Ostracoda Report, but a comparison of specimens (females only), 

 scarcely bears out this opinion, though the resemblance is certainly very close.' 

 The mandibular teeth of the two forms seem to be slightly different, and the 

 natatory antennal setae of H. imbricata are very conspicuously plumose, while in 

 C. armata they are quite simple. The size of C. imbricata, also, is greater, being 

 3*6 mm. for the female, and 4 mm. for the male. 



The foregoing description, so far as the male is concerned, is taken from Dr. 

 Glaus ; the only specimen which we have seen is a female. 



Genus 6. Mikeoconchcecia, Glaus. 



Shell compressed, of small size, and with a striated or reticulated sculpture of 

 the outer surface ; anterior margin prominent, dorsal margin without any 

 posterior projection. Hinge well developed, a tooth on the left, and a hollow 

 on the right valve. The hooked lateral teeth of the mandible are strengthened 

 by a strong chitinous plate (Glaus), and there is a marginal bearded line of cilia 

 and short bristles. Proximal sensory filaments of the antennae of the male 

 furcate ; in the female, most, if not all of them, are once or twice forked.* 



Mikroconchoecia Clausii, G. O. Sars. 



(PL Lxm., figs. 3-9.) 



1865. Halocypris sp., . . . Glaus, " Ueber die Geschlechts differenzen von 



Halocypris," Zeitschrift fiir Wissensch. 

 Zoologie, Bd. xv., Taf. xxx. [fide Glaus). 



* Claus says that all except one are furcate, but we have not made this out clearly. 



