REPORT ON THE AMPHIPODA. 89 



1815. Leach, W. E. 



The Zoological Miscellany ; being Descriptions of new, or interesting Animals, 

 by William Elford Leach. Illustrated with coloured figures, drawn from nature, by 

 R P. Nodder. Vol. ii. London, 1815. 



On page 21 Leach defines the new genus Atylus; — " Antennse i-a,ri\a\i\sX3i segmento ultimo e 

 plurimis articuhs minutis efformato ; superiores sub-hreviores articulo secundo tertio longiore ; 

 iiiferiores articulo secundo tertio sub-breviore. OcuU sub-prominentes rotundati inter 

 antennas in capitis processum inserti. Pedes 14; paria 1 et 2 monodactyla manu parvula, 

 compressa, 3, 4, 5, 6 et 7 ungue simplici instructa. Cauda utrinque stylis duplicis tribus 

 et superne stylulo utrinque mobdi instructa. Corpus (capite includente) 12-articulatum." 

 Stylis duplicis tribus is translated " with a triple series of double styles," and (capite 

 includente), "(including the head)." The type species Atylus carinattis is figured the 

 natural size, and the description is taken from the specimens of Gammarus carinatiis 

 described by Fabricius, Ent. Syst. 2. 515. 3, so that Leach feels justified in correcting that 

 author's statement that the hands are simple, " G. manibus adactylis." On page 23 

 the genus Dexamine, already established in the Edin. Encycl., vol. vii. p. 432, is here more 

 fuUy characterised: — " Aniennas triarticulatae segmento ultimo e plurimis articulis minutis 

 efl'ormato, segmento primo secundo breviore ; superiores longiores. Oculi oblongi hand 

 prominentes pone antennas superiores inserti. Pedes 14; paria 1 et 2 monodactyla manu 

 parvula, compressa, 3, 4, 5, 6 et 7 ungue simplici instructa. Cauda utrinque stylis duplicis 

 tribus, superneque stylo utrinque mobili instructa. Corpus (capite includente) 

 12-articulatum." The type-species is Montagu's "Cancer Gammarus spinosus," now 

 Dexamine spinosa. 



1815. Leach, W. E. 



A Tabular View of the external Characters of Four Classes of Animals, which 

 Linne arranged under Insecta ; with the Distribution of the Genera composing 

 Three of these Classes into Orders, &c., and Descriptions of several New Genera and 

 Species. The Transactions of the Linnean Society of London, vol. xi. Part the 

 Second, mdcccxv. pp. 306-400. (Read April 19, May 3, and June 1, 1814,) 



He here proposes to include in a new class the Syngnatha and Chilocjnatha of Fabricius [the 

 Myriapoda], which Latreille and Lamarck had arranged with the Arachnides. He therefore 

 distinguishes into four classes the Crustacea, Myriapoda, Arachnides and Insecta. The 

 Crustacea with " Branchiis pro respiratione," form two subclasses, the Entomostraca and the 

 Malacostraoa ; to the latter he unites the Tetracera, which Latreille had placed with the 

 Araclmides, and divides the subclass into two Legions, the Podophthalma and the 

 Edriophthalma, the latter being defined as having "ocuU sessUes." This Legion comprises 

 three sections, the first with "corpus lateraliter compressum. Pedes 14. Antennae 2 in 

 frontem insertte, una utrinque. (Cauda stylis instructa)," one genus. The second section 

 has "corpus lateraUter compressum. Pedes 14 coxis lamelliformibus. Antenna 4 per 

 paria insertee. (Cauda stylis instructa)." It includes five divisions with thirteen genera. 

 The third section has " corpus depressum. Antennre 4. Pedes 14." with four groups, seven 

 divisions and twenty-four genera, the first division with two subdivisions and three genera 

 belonging to the Amphipoda. 



Sectio I. contains only "Gen. Phronima, Latr.," whicli is fully described, and has "Spec. 1. 

 Phronima sedentaria." 



(ZOOL. CHALL. EXP. — PAET LXVII. — 1887.) Xxx 12 



