File:Transactions and proceedings and report of the Philosophical Society of Adelaide, South Australia (1878) (14597239647).jpg

Identifier: transactionsproc4119phil (find matches)
Title: Transactions and proceedings and report of the Philosophical Society of Adelaide, South Australia
Year: 1878 (1870s)
Authors: Philosophical Society of Adelaide, South Australia
Subjects: Philosophical Society of Adelaide, South Australia Science
Publisher: Adelaide : The Society
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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s an incomplete transverse suture on the firstepimera which seems to mark the line of division betw^eenthe two segments dorsally (Beddard: 1884, p. 8).(i) Theterminal segment of the peraeon is vestigial, its tergum beingunrepresented and its appendages smaller than those pre-ceding. The pleon consists of three free segments and acaudal shield. In the appendages the first pair of legs aredeveloped into characteristic subchelate gnathopods, and thesecond pair in the male may also be subchelate, though ofvery much smaller size than the first; the remaining pairsof legs are of the usual character, and are used for walking,or perhaps also to some extent for swimming. In the pleonthe first three pairs of pleopoda differ markedly from thefourth and fifth, and form flat leaf-like swimmerets abund-antly provided with hairs. The fourth and fifth arebranchial, and consist of a basal joint with lamellar outer (1) The references are made by the year of publication to thelist at end of this piaper.
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S93 and inner brandies, which act as gills, the outer branch ofthe fourth being stouter, and forming an operculum dividedby a transverse suture. The terminal appendages, or uropoda,are small and of the usual character, consisting of a shortbasal joint and flat inner and outer branches. The whole of the species of the genus known up to 1884were fully worked out by Mr. F. E. Beddard in his Reporton the Isopoda of the Challenger Expedition, in which healso considered the geographical distribution of the group,pointing out that the species are confined almost entirely tothe Southern Hemisphere, and have probably arisen on theshores of the South Polar Continent and thence spreadnorthwards. Mr. Beddard also drew attention to the fact that thesix species then known from Australia form a well-markeddivision of the genus, being characterized by the fact that thetergum of the fifth segment of the peraeon is extremelynarrow and that of the sixth obsolete in the middle line, andthat all the speci

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