128 BRITISH COPEPODA. 
the abdomen and finely aculeate. Length s'srd of an 
moein (Ui san,)), 
One of the less common British species. I have 
scarcely ever myself taken it, but am indebted to my 
friend, Mr. E. C. Davison, of Sunderland, for surface- 
net gatherings in which it occurred, from Grimsby, 
Teesmouth and Killybegs. The Rev. A. M. Norman 
mentions it as found “at Hillswick, Shetland, among 
b) 
weeds ;’’ and I have a single specimen, apparently ~ 
belonging to the same species, which was dredged 
amongst the Scilly Islands. It occurs also in gather- 
ings of Copepoda, made by the Rev. A. M. Norman, 
between tide-marks at Oban, and in material dredged 
in a depth of five fathoms at the same place. 
5. TuHanestris Crausu, Norman. Pl. LXII, figs. 1—12. 
Thalestris Claus, Norman. Brit. Assoc. Report, p. 297 (1868). 
Parathalestris Clausw, Brady and Robertson. Ann. and Mag. 
Nat. Hist., vol. xii, p. 136 (1878). 
Animal robust, stout and heavy in all its parts; 
rostrum short and blunt, not as long as first antennal 
joint; anterior antenna of the female (fig. 2) 9-jointed, 
gradually tapering to the apex ; third and fourth joints 
of the male antenna constricted, the fifth swollen and 
forming the base of the conical distal half of the limb 
(fig. 3). Secondary branch of the posterior antenna 
2-jointed. Branches of the mandible-palp (fig. 4) two, 
one small and bearing a single setz, the other larger 
