356 REV. A. M. NORMAN AND MR. G. S. BRADY 



Tribe. ANOMOPODA. G. 0. Sars. 



Feet differing widely from each other in structure, the ante- 

 rior more or less prehensile, without any branchial lamina at- 

 tached to them. Posterior antennae two-branched ; branches 

 sub-equal, cylindrical, slender, furnished with a few setae. 



Family. BOSMIKEMl. 



Anterior antenna? continuous with the rostrum, immovable in 

 the female, multiarticulate, having auditory cilia attached to 

 the inner side at some distance from the extremity. Posterior 

 antennae one branch three, the other four-jointed. Feet five 

 pairs, with the rudiments of a sixth pair, separated from each 

 other by nearly equal intervals ; a branchial lamina, which is 

 generally large, and extended in a longitudinal direction, attached 

 to the last feet. Intestinal canal simple, without either loop or 

 coecal appendages, but wide and flexuous near the commencement. 



Genus. BOSMINA. Baird. 



Carapace truncate posteriorly, and having the postero-ventral 

 angles of each valve generally produced downwards into a con- 

 spicuous, spine-like process. Head rather small, having a more 

 or less produced rostrum, with rounded extremity, to which are 

 affixed, immovably in the female, the anterior antennae. These 

 antennae are long and very slender, being equal to from one-third 

 to the entire animal in length, multiarticulate, giving forth at 

 some distance from their base a spine-formed process on the inner 

 side, at the origin of which is a group of tentaculiform setae. 

 Posterior antennae two-branched, one branch three- jointed, and 

 bearing five geniculate and ciliated setae ; the other four-jointed, 

 furnished with four such setae. Eye of considerable size; no 

 accompanying eye-spot. Abdomen small, superior margin at the 

 most only furnished with fine hair-like spines, chiefly at the 

 supero-posteal angle ; termination truncate, emarginate, terminal 

 claws springing from a produced process, of considerable size, 

 furnished with a row of small spines on the basal portion of the 



