I. '21. 46 



There are two or three small transparent spines at the lower 

 distal end. The dactyl is longer than the propodite and is 

 curved and slender. It ends in a sharp claw. There is a row 

 of fairly stiff setae along its entire upper edge. On the inner 

 surface and near the lower border there is a row of small groups 

 of setae which all point distally and are closely pressed against 

 the joint. 



The other three walking legs are similar to that just described, 

 except that the teeth on the carpus are rather less numerous 

 and are not so well developed. 



In the fourth pereiopods, which are of the usual form, the 

 imbricate scaly area of the propodite is reduced to a single row 

 of blunt teeth. 



The fifth pereiopods are of the usual form found in the 

 group ' 



In the male the left coxa of the fifth pair bears a long process 

 issuing from the sexual opening. It is curved outwards in a 

 semicircle and is slightly thicker than the fifth thoracic leg 

 itself. It has the form of an almost closed tube, there being 

 an open slit along the side next the body. 



There are three unpaired pleopods on the left side in the 

 male. The first two are biramous, with one of the branches 

 almost vestigial. The third is uniramous. In the female 

 there are four unpaired pleopods on the left. The first three 

 are biramous, the fourth is feeble and single ; it does not assist 

 in the attachment of the ova. 



The uropods are of the usual form. 



Size. — The carapace of the largest specimen taken by the 

 Helga measures 8 mm. 



General Distribution. — It occurs in all British seas : Shetland 

 and Hebrides (Norman), Firth of Forth (Scott), Northumber- 

 land (Meek), Aberdeen (Sim), Channel (Crawshay), Firth of 

 Clyde (Patience). It occurs also around the Faeroes (Hansen), 

 and along the coast of Norway as far as 62° 30' N.L. (Sars, 

 Ohlin). It has been recorded from the Skagerak and Kattegat 

 (Meinert, Stephensen). Southwards it extends through the 

 Bay of Biscay (Kemp, Milne-Edwards and Bouvier), along the 

 coasts of Spain (Milne-Edwards and Bouvier), into the Medi- 

 terranean : Toulon, Corsica (Milne-Edwards and Bouvier) off 

 the west of Sicily (Senna). It extends along the west coast of 

 northern Africa down to 17° 12' N.L., and is also found at 

 the Azores (Milne-Edwards and Bouvier). 



Vertical Distribution. — The species is found in depths ranging 

 from three to three hundred fathoms. It appears to be com- 

 monest from about twenty to fifty fathoms. 



Irish Distribution. — The original types of the species were 

 taken at Portaferry in Co. Down (Thompson). It has also 

 been recorded from Dublin and Belfast (Kinahan), and Galway 

 (Melville). The records of the Helga show that it occurs all 

 round the Irish coast. 



