CRUSTACEA MALACOSTRACA. III. 



20 5 



Bredefjord. In most cases either the right or the left branchial cavity of the host contained the para- 

 site, bnt in some few cases both branchial cavities were infested. — At East Greenland it has been 

 found only on S. polar is and was taken by Mag. Kruuse at Angmagsalik, Eat 65°3o' N.; by the Ryder 

 Exp. in Hekla Havn, Eat. ~jo°2~i' N. ; by the Ilnd Amdrup Exp. at Sabine Island, Eat. 74° 30' N. ; by the 

 Danmark Exp. at several places between Eat. ~](fip' N. and Lat. 76°5o' N. (Stephensen), finally by the 

 Duke of Orleans at Lat. 77°3i' N -> Eong. i8°24' W., 146 fath. (Grieg). 



At East Iceland it has been taken by the "Thor" in Rode Fjord, 88 fath., on S. spinas; near 

 the Fseroes by Dr. Th. Mortensen off Akraleite, ab. 150 fath., on 6". Lilljeborgii. 



Distribution. This species is known from Skager Rak on S. Lilljeborgii (H. J. Hansen), from 

 the whole coast of Norway from Christiania Fjord to Vadso, taken on S. polaris, S. spinus and S. Lillje- 

 borgii (G. O. Sars), and from the Barents Sea (Hoek, Weber), but not from the Kara Sea. At Britain 

 recorded from the Clyde (T. Scott), and from the south coast of Cornwall (Bate & Westwood). Off the 

 northern and the southern half of Baffin Island it has been taken several times on S. polaris (Ohlin). 

 Furthermore H. Richardson recorded it from Nova Scotia and several places at the east coast of the 

 U. S. A. north of Cape Cod, occurring not only on S polaris, S. spinus and 6". Lilljeborgii, but on S. 

 Fabricii Kr. and S. pusiold Kr. I think that all these statements are correct, but H. Richardson besides 

 recorded it from many places in the North-East Pacific, viz. from Puget Sound, ab. Lat 47V3 N., north- 

 wards to Alaska and the Bering Sea; it is stated to have been found on Spirontocaris spinus, on five 

 other exclusively Pacific species of the same genus, on Pandalus Montagui Leach., P. borealis Kr. and 

 the exclusively Pacific species P.Jordani Rathb., finally on Pandalopsis dispar Rathb. Later (1909) that 

 authoress added two stations from the west part of the Bering Sea and a place in the Sea of Japan 

 at Lat. 38°09' N. But several of these statements seem to me to be somewhat less certain, and a 

 critical re-investigation of the parasites would be desirable, especially if the second larval stage could 

 be found on Pandalus and Pandalopsis. It would, for instance, be interesting if B. hippolytes occurs 

 on specimens of Pandalus Montagui and P. borealis in the North Pacific, but not on the same forms 

 in the North Atlantic. 



146. Pseudione Hyndmanni Bate & Westw. 

 (PI. XV, figs. 12 a— 12 c). 



1868. Phryxus Hyndmanni Bate & Westwood, Brit Sessile-eyed Crust., Vol. II, p. 243. 

 ! 1898. Pseudione G. O. Sars, Account, II, p. 202; PI. 85, fig. 2. 



I9 oo. — Bonnier, Contrib. a l'Etude des ijpicarides, p. 295, PI. XVIII. 



Sars' figures and descriptions of both sexes are sufficient, but he did not know the second 

 larval stage. 



A male larva (fig. 12 a) is 0-84 mm. long, somewhat less than four times as long as broad, 

 with exceedingly short and fine hairs on the upper surface. The front margin of the head is strongly 

 convex; the eyes feebly developed, brownish, and I was unable to discover real ocelli on the sur- 

 face. — The antennulse (fig. 12 b) are extremely broad; first joint (/) with the front half of the outer 

 margin peculiarly curved, and the anterior part of second joint is produced inwards along the feebly 

 concave autero-lateral margin almost to the median line; both these joints without processes. Third 



