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



Antennfe inferiores duplo breviores, structura superioribus couformes. Oculi inter 

 utiumque antennaruni par siti, latiusculi, nigri. TentacuJa quatuor, quorum antica duo 

 biarticulata, articulo primo cylindrico, extimo falcato, raniulos^ pilifero. Inferiora subtus 

 caput prorumpeutia filiformia, inarticulata, flexilia. Pede^ octo, duo anteriores crassiores, 

 articulo primo cylindrico, duobus subsequentibus obcordatis, extimo seu chela, obovato, 

 turgido, granulifero : reliqui triarticulati, uncinulo armati. Pedes hranchiales sex, articulo 

 unico elongate formati apice setigero, e tuberoulo caudali prodeuntes. Appendices caudales 

 quatuor, cylindrici, recurvi, bispidi, inter duodecimum et tredicesimuni segmentum 

 erumpentes." 

 It migbt be possible for some one residing at Genoa to identify these Genoese Amphipoda. The 

 figures given to represent the natural size are so minute as to suggest some erTor. Fig. 4, 

 pi. i. is suggestive of Hijpeiia nmhtsarum, though the eye is represented only by a small o. 

 Fig. 6, pi. ii. may represent Ht/ale sp. Fig. 4, pi. ii. ought to be capable of identification 

 by the extreme length of the antennce of both pairs, but of the upper pair especially. The 

 name Gammarus longicorvis is preoccupied among the synonyms of CoropMum volutafor. 

 Spence Bate has suggested the identity of Gammcmis crassimanus with Alaera triincatipes. 

 Desmarest, Consid. g^n. sur la CI. des Crust, p. 265. n., also thinks it probable that 

 it belongs to the same genus as Meera grossimanus. Boeck thinks it is perhaps a Gamnmrus. 

 In his view, Gammarus cirdnnatus seems to be a species of AmphUhoii. Milne-Edwards and 

 Spence Bate alike omit Viviani's species from their general lists of Amphipoda, and in the 

 special lists of Mediterranean species by Costa, 1830, by Hope, 1851, by Stalio, 1877, 

 and by Carus, 1885, no notice is taken of them. 



1806. DuMERiL, Andr^; Marik Constant, born 1774, died 1860 (Hagen). 



Zoologie Analytique, ou Methode Naturelle de Classification des Animaux, 

 rendue plus facile a I'aide de tableaux synoptiques. Paris, m.dccc.vi. 



Dumeril rejects the precept of Linnaeus and Fabricius to draw the characters of classes, orders, 

 and genera from one and the same part, as inapplicable to zoology, however suitable it 

 might be to botany. He prefers the natural method, which studies all the parts of an 

 organism, with a view to its classification. In regard to the Crustacea he follows LatreUle 

 and Lamarck. He makes nine " general divisions " or classes, the Crustacea being the 

 sixth, between the Mollusoa and the Insects. The Crustacea are defined as "Animaux 

 sans vertfebres, munis de vaisseaux et d'organes respiratoires sous forme de lames ou de 

 branchies; pattes le plus souvent au nombre de dix." They form two orders, Entomos- 

 trac(5s and Astaooides. The latter, " k croilte calcaire," contain four families, Macroures, Car- 

 cinoides, Oxyrinques, and Arthrocephal^s. These last, "k tete s(5par(5e du corcelet," 

 correspond to the Branohiogastres of Latreille. The name is derived " De ApOpov membre 

 qui se meut, et de Ktc^aXj; tete." An alternative name is Capit<5s. The following definition 

 and table is given : — " Crustac^s k pattes ordinairement au nombre de quatorze ; a branchies 

 apparentes vers la queue et k tite articul^e sur le corcelet. 



pedonculfe ; . 



Genres. 

 I six paires de pattes en nageoires, . . . Mysis. 



{ point de pattes en nageoires, 



" A yeux. -I f terminee par deux serres, 



sessiles ; la troisi^me paire de 



jsiies ; la noisieiue pane ue j / l(,j,(,,,p, 



pattes, . . I simple; antennes inter- J ° '' " 



I mediaires plus, . ^ ^^^^^^^^^ _ 



Sqltllle. 

 Phronime. 

 Crevette. 

 Tlialitre." 



