REPORT ON THE AMPHIPODA. 265 



written ten or twenty years later, but lie fully ailmits that migration " is an actual fact in 

 nature, interfering much with the simplicity which zoological life in its diffusion would 

 otherwise present to us." 



The new species, published either in this work or in the two preceding papers also dated 1852, 

 are as follows : — in Subtribe I. Caprellidea. Fam. 1. Caprellidse; Proto elongahig, 'lAenii^eA 

 by jSIayer with Proto venfricosa, 0. F. MiiUer ; Protella r/mcilift, the only addition to the 

 variously-worded definition of Protella being, "pedes sex ultimi subaequi"; Caprella rohusta, 

 according to Mayer the young of Caprella acutifrons, Latr.; Caprella cornutafVnih. a variety 

 named ohtiisirodris ; Caprella attenuafa, which Mayer thinks may be the same as Caprella 

 sraura, Templeton ; of this a variety is named suhtenuiit ; Caprella (jlohifeps, which he 

 thinks may be a variety of Caprella ililatata, Krijyer ; the last-named species, which Dana 

 figures and describes, is held by ]\Iayer to be synonymous with Caprella acutifrons, Latr.; 

 Caprella januarii, Krbyer, which Dana figures and describes, is referred by Mayer to 

 Caprella xquilibra, Say ; Dana himself suggests that the animal whicli he figures as the 

 female may be a distinct species, for which in that case he proposes the name Caprella 

 humilis ; after Caprella globiceps he describes ^gina ? tenella and yEijina ? aculeata, 

 suggesting that the latter may be the female of the former. 



Subtribe II. Gammaridea. Fam. III. Corophidae. Subfam. 1. Clydonina^. Clydonia gracilis : 

 Clijdonia longipies, which with the preceding species should, according to BovaUius, be trans- 

 ferred to the genus Tijro, M.-Edw., among the Hyperidea ; Subfam. 2. Corophinae. 

 Corojyhium ? quadriceps, a species, as Dana himself intimates, of doubtful position, and 

 probably immature, since the length is given as " nearly one line ; " Platophium bradlieiuse ; 

 Cijrtopliium orientate ; Cratophium validiim, named by Sjj. Bate, in the Brit. Mus. Catal., 

 Podocerus validus ; his Gannnanu^ orientalis he here calls Cratophhnn orientate, and Sp. 

 Bate, in the B. M. C. renames it Podocerus orientalis. Subfam. 3. Icilinse. Icilius elliptiew, 

 which had been originally named Icilius ovalis. 



Fam. IV. Orchestida3. Orchestia (Tatitrus?) novi-xealamlin', with the suggestion, since proved 

 correct, by G. M. Thomson, that it may be the female of Talorchestia quogana, M.-Edw.; 

 Tatitrus Ijreciconiis, M. Edw., which he next describes, is, he says, " near the novi- 

 zealandix ;" according to the B. M. C. "Dana likewise considers it a true Talitrus, unless 

 it should be the female of Talorchestia Quogana," but I do not find this alternative in 

 Dana's own work ; his next species Orchestia {Tatitrus) insctdpta had been originally 

 published as Talitronus insculptus for the male and Talitrus oiiiatus for the female ; in the 

 addenda he calls it Orchestia tubercidata, Nicolet, for which the Brit. Mus. Catal. restores 

 Nicolet's name Orchestoidea tubercidata; Orchestia {Talitrus) hrasiliensis is named Orchestoidea 

 hradliensis in the B. M. C. ; Orchestia {Talitrus) pugettensis is named Orchestoidea 

 pugettensis in the B. M. C, but as only the female of this species is described, and the Cata- 

 logue states that in Orchestoidea " the female is a true Talitrus," it is difficiUt to see how the 

 determination is arrived at ; Orchestia {Talitrus ?) scabripies is transferred to Orchestoidea in 

 the B. M. C. ; Orchestia {Talorchestia) gracilis, of which the female had been already 

 published by Dana as Talitrus gracilis, is now Talorchestia gracilis, having in the male 

 "feet of first pair with a small, narrow hand," p. 862 ; Orchentia {Talorchestia ?) quoyana, 

 Milne-Edwards, is now accepted as without doubt a. Talorchestia ; in the subgenus Orchestia 

 he places Orchestia scutigerula, comparing it with Orchestia chilensis, IM.-Edw. ; Orchestia 

 ectpensis ; Orchestia chilensis?, Milne- Edwards, the female only, which is accepted in the 

 B. M. C. without a 1; Orchestia nitida; Orchestia serrulata; Orchestia tenuis; Orchestia 

 sglvicola, a species which G. M. Thomson, 1880, unites with Orchestia novss-zealandix, 

 Sp. Bate, and Orchestia tenuis, Dana, describing it as " a strictly terrestrial form, always 

 occurring among dank vegetation, bush soil, etc., and drowning very rapidly in water ; 

 extremely common ; " Mr. Thomson says, " it is singular that Prof. Dana shoidd have 



(ZOOL. CHALL. EXP. — PART LXVII. — 1887.) Xxx 34 



