56 THE VOYAGE OF H.M.S, CHALLENGEE . 



dislincta," referring to "Squillaa.ca.uda.ta, jiedibus quatuordecim Gronovius inAdisHelv. i, 

 p. 39, t. 4, figs. 8, 9 r' and " Cancer linearis, Linx Sijst. nat. p. 1056, n. 83 ? " To 

 tlie fuller description he appends the observation, " Ad genus Gammaroruni Celeb. J. C. 

 Fabricii hoc insectiim refero, quia primus certis caracteribus cancrorum familiam ab oniscis 

 distinxit ; proprium tamen genus cum Squilla quadrilobata et ventricosa Mulleri, 

 quibus Cauda nulla et pedes omnes unguiculati constitiieri videtur." It is now recognised as 

 Proto ventricosa, O. F. M. On pi. cxiv., figs. 11, 12, and p. 58, he figures and describes 

 Gammarus qtuxdrilobatus $, with references to " Squilla lobata, Zool. Dan. prodr. n. 2359." 

 " Fabricii Faun. Groenl. n. 225." " Squilla quadrilobata, Zool. Dan. fasc. 2, p. 21, tab. 56, 

 fig. 4-6." On pi. csvi, figs. 1-6, and pi. 59, Gammarns podurus is given, considered by 

 Milne-Edwards to be an Amphitlwe, by Speuce Bate a Pherusa, by Boeck with more 

 probability an undoubted Gammarus. It has a red spot on each of the seventh, eighth, 

 ninth, and tenth segments. Dorsal spines are shown on the penultimate and antepenul- 

 timate segments. Gammarus mutilus, figured on pi. cxvi., figs. 1-11, described on p. 60, 

 in Boeck's opinion is like but not the same as Gammarus locusta. llilne-Edwards 

 compares it with his Gammarus savii (called Mcera savii by Spence Bate), but thinks it 

 distinguished by the long accessory flagellum, the narrow first joint of the hind legs, and 

 the large rami of the last uropods. He says. Hist, des Crust, iii. 53 n., " La premiere 

 figure repr^sentant cette crevette de grandeur naturelle est trfes-mauvaise, et a (5te reproduite 

 dans I'Encyclopedie, PI. 336, fig. 43 ; mais les autres, qui peuvent r^ellement etre tres- 

 utiles pour la determination de I'esp^ce, n'ont pas 6te donnees dans cet ouvrage." The 

 name mutilus is itself not very easy to understand. It agrees, indeed, very well with the 

 fig. 1 which Milne-Edwards censures, for in that the animal abruptly ends with the third 

 pleon-segment. It might have been suggested that the other three segments were accidently 

 missing, but that Abildgaard has carefully figured the first, second, and third uropods. In 

 the enlarged figure of the antennfe, the flageUa of the upper and lower are drawn as equal 

 in length, and the accessory flagellum has about four and twenty joints. If this figure can 

 he trusted, it should be of essential service for determining this still doubtful species. There 

 are dorsal spines or teeth on the hind margins of the last segment of the pereion and the 

 first three of the pleon, which constitute an additional mark of distinction between this 

 species and Mxra savii. Gammarus spinicarpus, pi. cxix., figs. 1-4, pp. 66-67, is known 

 now as Leucotlioe spinicariia. Oniscus ceti, pL cxix., figs. 13-17, pp. 69-70, with 

 references to numerous authors and the synonyms " Oniscus Ceti, Linn.," " Pediculus 

 Ceti, JIartens," "Squilla Balaenee, Dbgeer," corresponds with Cyahnis nodosus, Ltk., 

 according to Liitken, the synonymy being erroneous. 



1791. Olivier, Antoine Guillaume, born 1756, died 1814 (Hagen). 



Histoire Naturelle. Insectes. Par M. Olivier. Tome sixieme. A Paris, m.dcc.xcl 

 Encyclopedie methodique, ou par ordre de matiferes ; par ime societe de gens de 

 lettres, de savans et d' artistes. 



The article Crevette extends from page 182 to page 190. The genus is thus defined: — 

 " Crevette. Gammarus, Fab. Cancer. Lin. Geoff. Squilla, Deg. Caractferes gen^riques. 

 Quatre antennes setacees, plus courtes que le corps ; les deux inferieures plus longues que 

 les deux superieures. Bouche formee d'une Ifevre superieure, de deux mandibules, de deux 

 machoires divis(^es, d'une Ifevre inferieure tres-avancee, et de huit antennules courtes. Yeux 

 immobiles, point du tout saillans. Pattes ordinau'ement au nombre de quatorze." 



After describing the upper lip and mandibles he says, p. 182, "les pieces qui se trouveut au 

 dessous, et que M. Fabricius a pris pour une levre inferieure, me paroissent devoir etre 



