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



ductum acutum, incurvatum. Oculi parvi." The type species, Acanthonotus cristatus, is 

 described and figured. The generic name being preoccupied, is changed by Boeck to 

 A eantlwnotozoma. 



The new genus Acanthosoma (Owen, MS.), is thus defined : — Antennae inaequales, superiores 

 dimidio breviores, articulo ultimo e plurimis segmentis efFormato, articulis tertiis et 

 secundis superiorum oequalibus. Pedes 4-antici, monodactyli, filiformes, articulo ultimo 

 primi paris unguiculato. Rostrum productum acutum, undulatum. Oculi parvi." 



This generic definition was sharply criticised by Kr0yer, who transferred the type species, 

 Acanthosoma hystrix, to AmpMihoe. Bruzelius made it a species of bis genus Paramphi- 

 tho'e. Boeck regards it as identical with. Onigcus ciispidatus, Lepechin, and as Owen'.s 

 generic name was preoccupied, he calls it Acantliozone cusjndata. E. J. Miers would 

 retain it as a distinct species, AcaiitJiozone hystrix, Owen. The Acanthozone hystrix 

 of Buchholz is, I think, clearly a distinct species, as ISIiers points out, and may receive the 

 name Acanthozone huehholzi in honour of its describer. Owen, in speaking of the rostrum 

 of his species, says, "this part is white, curved over the head, and directed forwards." 

 The description by Spence Bate, Brit. Mus. Catal., p. 147, corrects this statement, saying, 

 " Cephalon furnished with a minute rostrum. First segment of the pereion having a 

 large central dorsal tooth projecting upwards and forwards on the anterior margin." 

 Buchholz supposes that Kr0yer, Bruzelius, and Boeck, have only had young examples to 

 examine, and would so account for the diiJerences between their specimens and his, hut 

 Owen says expressly " Plate B, fig. 4, represents a large-sized specimen of the Acantho- 

 soma Hystrix," so that to him, at least, Buchholz's argument will not apply. 



1829-Guerin-Meneville, F. E. 



1844. 



Iconographie du Regue Animal de G. Cuvier, ou representation d'apres nature 



de Tune des especes les plus remarquables et souvent nou encore figurees, de cliaque 



genre d'animaux. Avec un texte descriptif mis au courant de la science. Ouvrage 



pouvant servir d' Atlas a tons les traites de zoologie. Par M. F. E. Guerin- 



Meneville. Tome II. Planches des Animaux invertebres. Tome III. Texte 



explicatif. A Paris, 1829-1844. 



[This work was published in licraisons between 1829 and 1844. The Plates containing 

 Amphipoda probably all belong to the early part of 1836. An advertisement in the 

 " Quarante-cinqui6me livraison. Crustac(5s. PI. 35.," says, "La 46'= et dernifere livraison se 

 composera du Texte descriptif de ITconographie et paraitra fin mars 1838," but the promise 

 was not, it appears, fulfilled till the end of 1843. The specific names, however, being given 

 on the Plates, will carry the date 1836.] 



In the third order of Crustacea, les Amphipodes "genre CEEVETTE (Gammaeus. Fab.)" 

 stands alone, with various sub-genera. In the description of PI. 25, fig. 4 is referred to 

 Phronima atlantica, Guerin, 1836. Branchial vesicles are shown as attached to the third, 

 fourth and fifth perreopods. The observation foUows, " Nous avons une autre espece, prise 

 dans rOcean qui baigne les cotes de TAmerique, assez loin de 1' embouchure de la Plata. 

 File ressemble k la precedente, mais la main de la cinquifeme paire de pattes est beaucoup 

 plus longue et plus grele, pen renflee vers I'extremite, avec la gritt'e simple, mais fortement 

 lenflee au milieu et une forte dent au cote interne de la pointe opposie de cette griffe. 

 Cette troisieme espece a, comme on le voit, beaucoup de ressemblance avec la Phr. 

 yedentaria, mais elle s'en distingue facilement par Tabsence dc dent au milieu interne du 

 doigt mobile. Nous lui avons donne le nom de Phronima solitaria." 



