ee ee ee ae 
of the Fishery Board for Scotland. 239 
of the flood tide, there is a large admixture of fresh water in this portion 
of estuary of the Forth. It may be that the peculiar alternating conditions 
thus produced are favourable to the welfare of this and other organisms ; 
but whether that be so or not, it is certain that Pterinopsyllus is compara- 
tively frequent here, while it is apparently exceedingly rare where the more 
normal marine conditions prevail.* 
Family Harpacticip#, Claus (in Part). 
Genus STENHELIA, Boeck (1864). 
Stenhelia hispida, Brady. i 
1880. Stenhelia hispida, Brady (8), wol il. p. 32, pl. xlii figs. 
1-14. 
1893. Stenhelia hispida, I. C. Thompson (33), p. 19. 
Halntat.—Of St Monans. Rather scarce. 
This, which appears to be a comparatively rare species in the British 
seas, 1s apparently widely distributed. It has been obtained at Tobermory 
(Rev. A. M. Norman); off Hartlepool and Marsden, Durham, and at 
Portincross, Ayrshire (Dr G. 8. Brady); in Ventry Bay, Ireland (Mr 
E. C. Davidson); in rock-pools at Hilbre and Puffin Islands, at Garth 
Ferry, and in Port Erin Bay, Isle of Man (I. C. Thompson). 
Stenhelia hirsuta, I. C. Thompson. 
1893. Stenhelia hirsuta, I. C. Thompson (33), p. 20, pl. xxxi. 
1894. Stenhelia hirsuta, T. and A. Scott (31), p. 146. 
Hatntat.—Off St Monans and at the north end of Inchkeith Island. 
Mr I.C. Thompson, of Liverpool, obtained this interesting species amongst 
mud dredged from 29 fathoms in the Irish Sea, and about twelve miles west 
from Port Erin, Isle of Man. The females of this species carry two 
ovisacs as shown by Thompson’s figure ; and several of the specimens 
obtained in the Firth of Forth were also provided with two ovisacs. 
Stenhelia dispar, T. and A. Scott. 
1894. Stenhelia dispar, T. and A. Scott (31), p. 141, pl. viii. figs. 
8-12. 
Description.—Female. Length, ‘55 mm. (7;th of an inch). Rostrum 
of moderate length. Anterior antenne short, moderately stout, and eight- 
jointed. the fifth, sixth, and seventh joints are small, but the last is about 
equal to the combined length of the two preceding joints, as shown by the 
annexed formula :— 
Ae Wee ey be Gin Oi." Be. eae 
Rais a A aS 6. gear 
The posterior antenne are somewhat similar to those of Stenhelia ama, 
Brady, except that the last joint of the secondary branch bears one mar- 
ginal and one apical seta instead of two apical sete. Mouth organs 
similar to those of Stenhelia ima. First pair of thoracic feet slender, and 
also somewhat like those of that species. A spiniform plumose seta springs 
from the lower margin of the second basal joint, and close to the proxi- 
mal end, interiorly, of the inner branches ; there are no sete on the inner 
margin of the outer branches. The fourth pair are also somewhat 
similar to those of Stenhelia vina. The basal joint of the fifth pair is large 
and sub-triangular, and furnished with three sete on the inner margin and 
* My son obtained Pterinopsylius in material from the Moray Firth dredged from 
a depth of 40 fathoms, 
