Occurrence. I have met with this form not unfrequently in several places 

 on the Norwegian coast, from the Christiania Fjord to Trondhjem, in moderate 

 depths ranging from 20 to 100 fathoms muddy bottom. In its behaviour the 

 animal agrees with Macrocypris minna, being, like it, quite incapable tc 

 move freely in the water. 



Out of Norway this form has not yet been recorded. 



Subfam. 3. Bairdiinae. 



Characters of the subfamily. Shell of somewhat varying shape and rather 

 firm in consistency, with the valves conspicuously unequal, the left one being 

 the larger. Antennae not adapted for swimming; the anterior ones with the 

 3 segments of the basal part well defined, terminal part short, 4 articulate, 

 but sharply marked off from the basal one, and densely setiferous. Posterior 

 antennas, as in the 2 preceding subfamilies, distinctly 6-articulate, penultimate 

 joint however firmly connected with the preceding joint and more or less pro- 

 longed; apical claws only 2 in number, both issuing from the terminal joint. 

 Mandibles and maxillae on the whole of normal structure. Maxillipeds pro- 

 nouncedly pediform and, like the 2 succeeding pairs of limbs, ambulatory, though 

 differing from them in the presence of a well developed vibratory plate attached 

 to their base posteriorly. Caudal rami of small size, though well mobile, and 

 built quite on the type of most other Cypridae. Ovaria and testicles not 

 entering between the lamellae of the valves. Ejaculatory tubes wholly absent. 



Remarks. This is perhaps the most anomalous of the 5 subfamilies 

 comprised within the family Cypridce, and, indeed, on a closer examination of 

 a Mediterranean species belonging to the typical genus Bairdia, I found this 

 genus to differ so decidedly from the other known genera, that it appeared to 

 me requirable to establish for its reception a distinct family, Bairdiidce, inter- 

 mediate between the 2 other families of the Podocopa 1 ). Although this family 

 has been generally accepted by recent authors, I am now of opinion, that the 

 systematic rank of a subfamily would be more appropriate, and that this sub- 

 family should be classed under the head of the Cypridce. Indeed, on a closer 

 examination, it may be recognised, that both in the structure of the shell and 

 in that of the appendages, the Cyprid type is more apparent than the Cytherid 



Cfr. G. O. Sars, "Ostracoda mediterranea" Arch, f Math. & Naturvid. f. 1887. 



