MORE LIGHT IN THE FUTUEE 417 



back to chapter xvii., page 235. Bopyrina virhii, corre- 

 sponding with the figure of the young female given by 

 Kossmann in the ' Zeitschrift fiir Wiss. Zool.' Bd. 35, pi. 34, 

 fig. 6, 1881, has been found lying across the hind dorsal 

 margin of the carapace of Hippolyte varians taken at Ilfra- 

 combe. From the conical mouth-apparatus protrude a pair 

 of denticulate lancets, the points of the mandibles. 



Bopyroides, Stimpson, 1864. Formed for those species 

 that agree in shape and structure with Bojiyrus, but differ 

 in their branchial features in having merely fleshy ridge.s 

 instead of laminse, with the segments of the pleon distinct. 

 See ' History of British Sessile-eyed Crustacea,' vol. ii. p. 

 223. 



Bopyroides acutimarginatus, Stimpson, 1864, on ff;))- 

 polyte brevirostris. Stimpson also thinks that Bupyrus 

 hippolytes, Kroyer, should be placed in this genus. By 

 Bate and Westwood that is called Ch/ge hippolytes (Kroyerj. 

 Kroyer's species was taken on Hippolyte polaris. The 

 host of the British form is not named. 



Eemiwrthrus, Giard and Bonnier, 18S7. The authors 

 say, ' It is impossible to leave in the genus Phryxus the 

 parasites of the abdomen of Virhius and Hippolyte. These 

 animals differ much from the Phryxus type, alike in the 

 female and in the male, which has all the pleon-segments 

 free and furnished with rudimentary limbs. We have 

 established for these Bopyrians the genus Hemia/rthrus.' 

 In the promised continuation of their great work on the 

 Bopyridffi, no doubt the obscure relations between this and 

 some of the preceding genera will be illuminated. 



Hemia/rthrus typtonis, Giard and Bonnier, 1890, on 

 Typton spongicola, Costa. 



HemiaHhrus philonlJca, Giard and Bonnier, 1890, on 

 Niha edulis, Risso. 



Hemiarthrus virhii, Giard and Bonnier, 1890, on ' Vir- 

 hius ' viridis, Otto. 



Hemia/rthrus Granchii, Giard and Bonnier, 1890, on Hi2:i- 

 polyte Gramchii, Leach (?). This and the preceding species 

 answer to what Walz has called Phryxus abduminalis, 

 Kroyer. 



