MORE LIGHT IN THE FUTURE 417 



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

 sponding with the figure of the young female given by 

 Kossmann in the ' Zeitschrift fur 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 Bopyrus, but differ 

 in their branchial features in having merely fleshy ridges 

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

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

 223. 



Bopyroides acutima/rginatus, Stimpson, 1864, on Hip- 

 polijte brevirostris. Stimpson also thinks that Bopyrus 

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

 Bate and Westwood that is called Gyge hippohjtes (Kroyer). 

 Kroyer's species was taken on Hippolyte polaris. The 

 host of the British form is not named. 



Hemiarthrus, Giard and Bonnier, 1887. The authors 

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

 parasites of the abdomen of Virbius and Hvppolyte. 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 Hemiarthrus.' 

 In the promised continuation of their great work on the 

 Bopyridse, no doubt the obscure relations between this and 

 some of the preceding genera will be illuminated. 



Hemiarthrus typtonis, Giard and Bonnier, 1890, on 

 Typton spongicola, Costa. 



Hemiarthrus philonlka, Giard and Bonnier, 1890, on 

 Nika edrdis, Risso. 



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

 bius ' viridis, Otto. 



Hemiarthrus Cranchii, Giard and Bonnier, 1890, on Hip- 

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

 answer to what Walz has called Phryxus abdominalis, 

 Kruyer. 



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