134 BRITISH COPEPODA. 



seta near the base, and four more towards the apex, 

 from which spring three setse, one much larger than 

 the others. Last abdomina Isegment very short, tail- 

 segments (fig. 11) about thrice as long, tapering 

 towards the apex and armed with a row of serratures 

 along the greater part of the outer margin. Second 

 foot of the male like that of the following species 

 (T. hibernica). The limbs are all short, but the first 

 pair of feet are longer than the others. Length 

 Yg-th of an inch (1*7 mm.). 



I have seen only one specimen a male of this 

 species, which was dredged on a bottom of muddy 

 sand in New Grimsby Harbour, Scilly ; depth fourteen 

 fathoms. The characters of the posterior foot- jaw and 

 tail-segments are abundantly sufficient to distinguish 

 it from any described species. 



8. THALESTEIS HIBEENICA, Brady and Robertson. PL LXII, 



figs. 1317, and PL LXIII, 

 figs. 14, 15. 



Thalestris hib&rnica, B. & R. Ann. and Mag. Nat Hist., ser. 4, 

 vol. xii, p. 135, pi. viii, figs. 1719 (1873). 



Body slender, rostrum of considerable length. 

 Anterior antennae 9-jointed, of moderate length, rather 

 thickly clothed along the anterior margin with shortish 

 hairs ; second, third, and fourth joints nearly equal, 

 about twice as long as broad ; fifth, sixth, seventh, 

 and ninth also nearly equal, and about half the length 



