176 THE VOYAGE OF H.M.S. CHALLENGER. 



nouveaus." lu the species of Gamviarus from the earlier edition, number 6, the Plierusa 

 fucicola of Leach, is given as "Crevette fucicole. Gammarug pherusa," the last word 

 probably by a slip. We are told to add a great number of species described or figured by 

 various authors. The notes remark that in all these Crustacea the upper antennse have a 

 peduncle of three joints with a multiarticulate lash, and that the peduncle of the lower 

 antennfe has four joints. Dexamine, Leach, is referred with hesitation to the " division 

 des Amphitoes." Of Leucothoe the only species well known is said to be the Lijcesta furina 

 of Savigny, but the Gammarus artindosus of Montagu " parait etre aussi un Leucothoe." 

 Leach's genera Melita and Moera [ilsera] are rejected. " Les Pheruses doivent etre reunies 

 aux Amphitoes dont elles ne different que par un peu moins d'elargissement dans les mains."- 

 Amjiliifoe, Leach, distinguished from Gammarus by the absence from the upper antenna? 

 of an accessory llagellum, is accepted. 



In the text of this oddly arranged work the following remarks occur as if part of the original 

 edition, though the references show that they are not so : — " Nous avons donne le nom 

 gfoerique d'ISiEA h des Amphipodes qui sont tres voisins des Crevettes, niais qui out toutcs 

 les pattes subcheliformes (voyez Ann. des Sc. nat. t. 20. pag. 380, et Hist, des Crust, 

 pi. 29, lig. 11). 



" Dans notre genre Lysionasse il n'est an contraire aucune patte qui ait ce mode d'organisation 

 (voyez le Lysicmassa costx. Edwards, Ann. des Sc. nat. t. 20, pi. 10, fig. 17). 



' Le genre Phlias de M. Guerin ne difiere du precedent que par I'absence du filet multiarticule 

 accessoire des antennes superieures. (Esp. le Fhlias serrafus, Guerin, ISIag. de zool. cl. vii, 

 pi. 19)." 



To Talitrus Lamarck had assigned "bouche comme dans les Crevettes." A note here says 

 "excepte que les maudibules ne portent que des vestiges d'une tige palpiforme." This 

 statement probably rests not on original observation but on Savigny's figure of the mandible 

 of Orchestia montafjui, or on Guerin's figure of the mandible of Talitms platijchelis, 1835, 

 since in 1840 Milne-Edwards says of Talitrus, "les mandibules (fig. 3) ne preseat^nt que 

 des vestiges d'un appendice palpiforme, ou en manquent meme completement. His figure 

 shows no trace of a palp. Nevertheless it may be true that in some of the Orchestidie 

 there is a rudiment of it. Such at least I fancy that I have discerned in Hyalella inermis, 

 S. I. Smith. Talitrus in Lamarck has three species, locusia, (/ammareHtis, carinaius. A 

 note to the second points out the difference of Orchestia from Talitrus, and that to Orchestia 

 should be referred Savigny's figures 7 and 8 on Plate 11 of his great work, "Orchestia 

 Fisrherii, IM.-Edw.," etc. A note on the third, which is Fabricius' species, referred by Leach 

 to Atylus, says, "le genre Atyle doit prendre place dans la tribu des Corophio'ides ou 

 Crevettiniens marcheurs et se distingue par ses antennes non pediformes, et ses mains de la 

 seconde paire tres petites et a grifFes simples." 

 Corophium is regarded as type of a tribe called here Orevettiniens-marcheurs, distinguished from 

 the sauieurs by slender body, small epimera, tail not formed for leaping, and distinguished 

 from other genera of the same division by pediform lower antenna, upper antennae without 

 accessory flagellum, second gnathopods neither didactyle nor prehensile. 



Jassa and Poclocerus of Leach are distinguished from Corophium " en ce que leurs quatre pattes 

 anterieures sont terminees par une grosse main subcheliforme," but it is rightly observed 

 that they are distinguished from one another only by trifling characters. " Le genre 

 UxciATA de Say," the editor remarks, "doit prendre place aupres des genres prccedens, 

 mais s'en distingue par I'existence de deux tigelles multiarticulees a I'extremite des antennes 

 suijerieures." Say's Unciola is of course intended. Say's Cerapus is mentioned with the 

 type species tulmlaris and Templeton's abditus. It is then observed in conclusion : — 

 " Enfin, notre genre Erichthonie etablit le passage entre ces Crustaces et les Leucothoes ; 

 la conformation generale du corps est la meme que chez los precedens, mais les antennes ne 



