REPORT ON THE AMPHIPODA. 81 



only been taken by dredging at Torcross." As a matter of fact now-a-daya at Torquay and 

 Ilfracombe, in shore-pools, the pelagicus and puldieUws forms are extremely, not to say 

 tiresomely, abundant. 

 After describing two species oi Phalangium, on page 102 Montagu gives " Oniscds Tbstudo 

 Tab. V. fig. 5. Body sub-ovate, composed of eight joints rising to a ridge on the back ; the 

 plates elevated at their edges ; the four first fall very low on the sides, and obscure the 

 anterior legs ; along each side of the body a row of small tubercles ; the front sub-bifid ; 

 antennae four, very short, lower pair hid beneath : eyes prominent, black : posterior end 

 obtusely pointed ; caudal fins beneath, obscure : legs fourteen, short and strong, the tliree 

 posterior pairs longest ; aU furnished with a simple claw. Length two lines. Colour dull 

 red, with a white spot on the anterior part of the back, but as the insect dies this mark is lost. 

 Rare." By Bate and Westwood, Brit. Sess. Crust., voL i. part 5, p. 228, 1862, this is made 

 the type of a new genus Pereionotus. See also Brit. Mus. Cat., p. 375, 1862. These authors 

 recognise that "this genus bears a near relationship to that of Phlias oi Gu^rin," 1836. 

 They only find indeed one distinction of importance, that while Pereionotus testudo has the 

 last nropods uniramous, Phlias serratus, taken on the voyage from the Falklands to Port 

 Jackson, has these nropods biramous. A specimen from the Mediterranean which Spence 

 Bate has named Phlias rissoanus, he unfortunately left unexamined in regard to the last 

 nropods. Grube's genus Icridium, 1863-4 would seem undoubtedly synonymous with 

 Pereionotus, but that its author declares that his Icridium fuscum has no telson. Cams, 

 Prodr. Faun. Medit., 1885, gives under "Icridium Grubk (^Phlias Gu^E.)," "I. Rissoanum 

 Catta {Phlias Rissoana Sp. B., I. fuscum, Gr.). ?." That further investigation will unite 

 Plilias, PereionotiLS, and Icridium in one genus seems not improbable. In that case Phlias, 

 Gu^rin, will take precedence, with Onisaus testudo, Montagu, for the type species. 



1810. Latreille, p. a. 



Considerations gdnerales sur rordre naturel des Animaux composant les classes 

 des Crustaces, des Araclinides, et des Insectes ; avec un tableau methodique de leurs 

 genres, disposes en families. Paris, 1810. 



The first part, pages 9-87, reviews in general the work that had been done up to that time in 

 regard to the classification of the groups mentioned in the title. In the second part, the 

 Crustacea are divided into two Orders, Entomostraca and Malacostraca. The Malacostraca 

 are divided into seven families, the first five with " tete confondue avec le corcelet," the 

 sixth and seventh with " tete distincte du corcelet." The sixth, or SquiUares, has " Yeux 

 pediculcs." The seventh, Cr^vettines, GMnmarinm, has "Yeux sessiles." In this last, 

 two groups are formed, the first containing but a single genus, the second much subdivided, 

 as follows : — 



"I. Dix pates. G. 40. Phronime, Phronima." 



" II. Douze a quatorze i:)ates. 1. Des appendices articules et saiUans ait, bout de la qiceue. 

 A. Les quatre antennes terminees par un filet articule. G. 50. Crbvette. Gammarus." 

 "G. 51. Talitre, Talitrus." "B. Antennes inferieures tres-grosses, point terminees piar un 

 filet, et formees de quatre articles (les deux prates anterieures terminees par une inain, avec 

 un doifft ou crochet mobile). G. 52. Corophie. Corophium. 2. Point d'appendices articules 

 et apimrens au bout de la queue. G. 53. Chevrolle. Caprella." "G. 54. Cyame. Cijamus." 



On pp. 422-3, species are given for these genera as follows: — "*Phronyme. Cancer sedentarius, 

 Forsk. Crevette. Gammarus pulex, Fab. Talitre. Oniscus gammarelliis, PalL *Corophie. 

 Gammarus longicornis, Fab. Chevrolle. Cancer linearis, L. *Cyame. Pycnogonum ceti, 

 Fab." The asterisks indicate the genera instituted by Latreille himself. 



(ZOOL. CHAIL. EXP.— PART LXVII.— 1887.) XxX 11 



