E.ev. T. R. R. SteLbiiig on Aniphipodous Crustaceans. 341 



auotlier, viz. Anonyx Edwardsi and Anonyx minutus. The 

 former appears, however, to be identical, not with the original 

 Anonyx Edwardsi of Kroyer, but with the Anonyx serratus 

 of Boeck ; and Boeck, in his subdivision of the genus, uniting 

 this species with Anonyx jpinguis and Anonyx minutus^ has 

 given them the generic name of Orchoniene. A rearrange- 

 ment of the specific names was doubtless needed ; but the use 

 of splitting up a genus, itself so closely allied to its neigh- 

 bours Lysianassa, CaUisoma^ and others, is less obvious. It 

 will, indeed, be a hard necessity for the study of sessile-eyed 

 Crustaceans, if it is forced to accept the principles of classifi- 

 cation worked out Avith so much industry by Axel Boeck, 

 largely based as they are upon differences in the organs of 

 the mouth. How prone authors are to register unimportant 

 differences as characters that make for generic or specific di- 

 stinction is rather amusingly illustrated in this veiy genus 

 Orchoniene of Boeck. In describing the genus he says, "epi- 

 merum quintum altius quam latius:" yet of 0. jnnguis he says, 

 "epimerum quintum eadem altitudineac latitudine," of 0. ser- 

 rata^ " epimerum quintum latius quam altura," of 0. umbo, 

 " epimerum quintum in medio gibberum magnum eminens ;" 

 so that only the two remaining species, 0. minuta and 0. 

 Goesii, have the generic " epimerum quintum altius quam 

 latius." When, moreover, the three descriptions of the species 

 of Orchoniene or Anonyx named respectively ^;i*/<^M«s, serratus^ 

 and minutus are compared throughout, it will be found that 

 they consist entirely of characters which are exceedingly liable 

 to vary with age and sex. The same remark will apply to 

 the Anonyx Edwardsi &.nd Anonyx minutus described in the 

 ' British Sessile-eyed Crustacea.' Of these two, the former 

 is the female, the latter almost certainly the young of Anonyx 

 serratus — the adult male now to be described having apparently 

 hitherto escaped observation, unless, which is highly probable, 

 it be the Anonyx [Orcltornene) innguis above mentioned. 



The following are its characters. The eyes are large, reni- 

 form, and red. The upper antennas have the first joint thick, 

 the two following mftch shorter, and sloping downwards at 

 the top. The first articulation of the flagcllum is nearly as 

 long as all the rest of it. It has two rows of hairs on the 

 inner side, and, also on the inner side, the secondary appen- 

 dage with its first articulation long, but not so long as that of 

 the flagcllum. The lower antennae have a peduncle of short 

 articulations, followed by a flagcllum considerably longer than 

 the whole animal, consisting of about seventy articulations 

 gradually increasing in length and tenuity towards the end, 

 and each surmounted by the calccola which has been described 



