62 BRITISH GOPEPODA. 
of Cyclops (?), which I have not been able to identify 
or describe from want of sufficient material. 
Genus 15. Musocura, Boeck (1864). 
(Paratachidius, Brady & Robertson, 1873.) 
First pair of antenne 7- or 8-jointed; inner branch 
of the second pair small, 1- or 2-jointed. Mandible- 
palp of one branch. Inner branch of the first pair of 
feet 2-jointed, the first jot. being usually much elon- 
gated, the second and third coalescent; outer branch 
shorter, 3-jointed. Inner branch of the second, third, 
and fourth pairs 2-jointed, short. : 
There is nothing to distinguish Mesochra from the 
genus Canthocamptus excepting the structure of the 
swimming-feet, the inner branches of which are con- 
stantly 2-jointed. 
1. Mrsocura Littseporem, Boeck. Pl. XLI, figs. 15— 
21; and Pl. XLVay aes 
16221. 
Mesochra Lilljeborgu, Boeck. Oversigt Norges Copepoder, p. 51 
(1864). 
Paratachidius gracilis, B.& R. Ann. and Mag. Nat. Hist., ser. iv, 
vol. xu, p. 181, pl. viii, figs 8—16 (1873). 
Rostrum large, longer than the first jomt of the 
anterior antenna; head united with the first thoracic 
segment ; first four abdominal rings bordered behind 
