CRt'STACKA MAIJtCOSTRACA. 111. ~_- 



_^ 



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

 -:ti. hut in some few cases both branchial cavities were infested. -- At East Greenland it has been 

 {omul only on S. fwlaris and was taken by Mag. Krunse at Angmagsalik, Lat 65*30' N.; by the Ryder 

 F.xp. in Hckla Havn, Lat To'a;' N.; by the Ilnd Amdrup Exp. at Sabine Island, Lat 743o' N.; by the 

 Danniark Kxp. at several places between Lat. 764o' N. and Lat 76*50' N. (Stcphensen), finally by the 

 Duke of Orleans at LaL 773i' N., Long. i824' W., 146 fath. (Grieg). 



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

 tlu- Fseroes by Dr. Th. Mortensen off Akraleite, ab. 150 fath., on 51 UUjtborgii. 



Distribution. This species is known from Skager Rak on .S'. IjHjtborgit (H. J. Hanson}, from 

 tlu- whole coast of Norway from Christiania Fjord to Vadso, taken on S. fiolaru. S. S^I'MUS and .S'. Ijlljf- 

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

 recorded from the Clyde (T. Scott), and from the south coast of Cornwall (Hate & West wood). Off the 

 iii -I tin i M and tin- southern half of Baffin Island it has been taken several times on .S'. polar is (Ohliiu 

 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 X folarit, S. sfiinus and 51 IMljtborgii, but on J>1 

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

 recorded it from many places in the North-Kast Pacific, viz. from Puget Sound, ab. Lat 47 1 ,', 8 N., north- 

 wards to Alaska and the Bering Sea; it is stated to have been found on Sfirontocaris .////-, on five 

 other exclusively Pacific species of the same genus, on Pandalus Montagui Leach., /'. bortalis Kr. ami 

 the exclusively Pacific species P.Jordani Rathb., finally on Pandalo/>sis 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 38O9* 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 H. kipf>olytfs occurs 

 on specimens of Pandalus Montagui and /'. borcalis in the North Pacific, but not on the same forms 

 in the North Atlantic 



146. Pseudione Hyndmanni Bate & Westw. 

 (PL XV, figs. la a 12 c). 



1868. Pkryxus Hyndmanni Bate & Westwood, Brit Sessile-eyed Crust, VoL II, p. 243. 

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



19001 Bonnier, Contrib. a 1'Etude des Epicarides, p. 295, PL XVIII. 



Sars 1 figures and descriptions of both sexes are sufficient, but he did not know the second 

 il stage. 



A male larva (fig. 12 a) is 0*4 mm. long, somewhat less than four times as long M 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 antennuhe (fig. lab) 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 antero-lateral margin almost to the median line; both these joints without processes. Third 



