REPORT ON THE AMPHIPODA. 185 



In his general description of the Amphipod structure, Milne-Edwards notes that the mandibles are 

 " pourvues, en g(5neral, d'une tige palpiforme," that the dorsal arch in the thoracic segments 

 is generally " compost de trois piices bien distinctes, savoir : un terguni et deux epimeres," 

 that at the base of most of the thoracic limbs there is on the inner side " une grande v&icule 

 membraueuse qui semble etre le representant de la brnnche externa des pates-machoires et 

 des pates ordinaires chez certains Podophthalmes, et qui pr(5sente ici tous les caractires d'un 

 organe de respiration." The females, he continues, carry their eggs under the thorax, and 

 often have flabelliform appendages fixed to the base of the feet to serve this purpose, but at 

 other times their functions are discharged by the respiratory vesicles. He does not, how- 

 ever, here specify any instances to justify the last observation, but subsequently he applies 

 it to the genus Hijpei-ia and the genus Phromma, asserting that in the latter genus there 

 are five pairs of branchial vesicles, not three pairs only as commonly supposed. He says 

 that the Amphipoda are all aquatic — a statement, which, in the light of later discoveries, 

 requires some modification. He divides the order into two groups or families in the 

 following manner : — 



" Pates-machoires trhs grandes recouvrant toute la bouche et formant 

 une espece de levre sternale impaire terminee par quatre grandes 

 lames corn^es et deux tiges palpiformes tres-longues. . Famille des Crevettines. 



" Pates-machoires ne recouvrant que la base des appendices pr^c^dents, 

 et formant une espece de levre sternale impaire terminee par 

 trois lames cornees, et depourvue de tiges palpiformes ou n'en 

 ayant que des vestiges, ...... Famille des Hypdrines." 



The Crevettines he divides into the Tribu des Sauteurs with twelve genera, and the Tribu des 

 Marcheurs with seven genera. The first Tribe contains two groups, the first of which, 

 comprising only TalUrus and Orcliestia, " essentiellement ar^nicoles, ne presentent au plus 

 que des vestiges d'une tige palpiforme aux niandibules." The remaining ten genera form 

 the second group, which live habitually in the water and have a very long mandibular 

 palp. 



In the description of genera and species under TaUtrus, Latr., he gives the species, 1. saltator, 

 named from the Squilla saltatrix of Klein rather than from Onisr.us lociista of PaUas, or 

 Cancer Zocjis^a, Linne; 2. Beaucoudraii, M.-Edw.; 3. brecdcorne, n. s., from New Zealand ; 

 4. platijcheles, Guerin ; 5. " Cloquefii, (Audouin), Savigny." 



Under Orchesfia, Leach, " § 1. Especes dont les pates de la sixi^me paire sont k peu prfes de meme 

 grandeur que celles de la septieme, ou un peu plus petites," he includes the species, 1. littorea, 

 Leach, with references to Easter, Herbst, !Montagu, &c., and the observation that Oniscus 

 gammarellus of Pallas and Oniscus stroemianus of Otto Fabricius and TaUtrus ijryUus of 

 Bosc, all seem to belong to this division of the genus Orcliestia ; 2. " Montagtd," Audouin ; 

 3. " Bottae," n. s., "espece tr5s voisine de I'Orchestie sauteuse, mais dont les pates de 

 la septieme paire sont etroites et de meme forme que celles de la pairo preccdente. 

 Habite la mer Rouge," where as Sp. Bate suggests, he has probably written sauteuse 

 by mistake for littorale or littorea. 4. " Beshat/esii, Audouin;" 5. longicornis, Say's 

 TaUtrus longicornis; 6. " CJiiUe^isis," n. s., which Dana and Spence Bate call Chilensis ; 

 7. " Quoyana," M.-Edw., called Talorchcsiia Qnoyana by Dana and Spence Bate. 

 " § 2. Espfeces dont les pates de la sixifeme paire sont beaucoup plus grandes que celles de la septieme 



paire" has the species 8. " Fischer it." M.-Edw., figured pi. 29. fig. 4. 

 In the genus Lysianassa he places the species, 1. " Cosfx," JI.-Edw. ; 2. lagena, answering to 

 " Lysianassa lagena y&\ Anonyx lagena, Kroyer;" 3. " I aAZw," Kroyer's Anonyx VaUii ; 



(ZOOL. CHALL. EXP. — PART LSVII. — 1887.) XxX 24 



