206 CRUSTACEA MALACOSTRACA. III. 



joint very broad, and its posterior margin produced into three somewhat small, acute teeth; the rami 

 normal. - The antennae nearly reach the middle of fourth thoracic segment. Proboscis not very 

 thick and constitutes, seen from the side, a protruding cone a little longer than deep and without 

 terminal disk. - - Thoracic epimera without serration; the legs subsimilar with the hand ovate. Pleopods 

 nearly as in Bopyroides. - - Last abdominal segment (fig. 12 c) posteriorly produced and divided by deep 

 incisions into two pairs of long, somewhat narrow comb-teeth, while the part between the outer deep 

 incision and the lateral margin is a broad triangle. -- Uropods somewhat long; the relative length 

 and thickness of the rami nearly as in Bopyroides. 



Remarks. Bonnier (1. c.) attempted to show that Pscudionc Hyndmanni as described and fig- 

 ured by Sars is a species different from that found in the Channel and at England and established 

 by Bate, though the host in both cases was Eup. bcrnhardus, and Bonnier applied the name P. proximo, 

 to the form figured by Sars, without having seen any specimen. The specimen mentioned by Sars as 

 found on E.pubescens was considered by Bonnier as being very probably a third species, P. dubia, 

 nomen nudum. This opinion was due to the unfortunate theory of Giard & Bonnier, that the same 

 species of parasite cannot infest two species of hosts. 



Occurrence. A small specimen of Eupagurus pubcsccns Kr. with this parasite was taken by 

 the "Ingolf". 



North of Iceland: Stat. 129: Lat. 6635' N., Long. 2347' W., 117 fath., temp. 6-5; i spec. 



Furthermore two specimens of Eup. pubescens with this Pseudionc were captured by the "Thor" 

 at the following places. 



South of Iceland: Lat 65i8' N., Long. 2i3o' W., 94 fath.; i spec. 



South-West of the Faeroes: Lat 6ii5' N -> ^og- 935' W., 463515 fath.; i spec. 



Distribution. Taken in the most northern part in the Sound and rather common in Kattegat 

 on Eupagurus bcrnhardus, most frequently in depths from 6 to io'/2 fath., but going down to 56 fath. 

 (H. J. Hansen). Rare at Norway, on K bernhardus and E. pubescens (G. O. Sars); besides in the North 

 Sea off Esbjerg (H. J. Hansen), at Ireland (Bate and Tattersall), and in the Firth of Clyde (T. Scott), 

 but in the last-named place taken in the branchial cavity of Hippolylc various, which makes the deter- 

 mination of the parasite a little doubtful. That the parasite mentioned by Bate ("Challenger" Macrura 

 p. 645) as "resembling Phryxus hindmannf and taken on a shrimp probably belonging to Plesionika 

 semilcevis Bate from the Philippine Islands cannot be our northern species is, of course, quite certain. 



147. Phryxus abdominalis Kroyer. 

 (PL XV, fig. 13 a). 



1840. Bopyrus abdominalis Kroyer, Naturh. Tidsskr. Vol. Ill, p. 102 112, 289 299; Pis. I II. 

 ? 1846. Kroyer, in Gaimard, Voy. en Scand., Crust PL 29, figs, i a i u. 



! 1898. Phryxus G. O. Sars, Account, II, p. 215; Pis. 9091. 



1905. Richardson, Monograph, p. 500; figs. 550552. 



The representation of Sars is rich and excellent Sars has also figured the male larva of second 

 stage and its head from below, but a few points on the antennulae may be added. - The antennulae 



