AUSTRALIAN MALACOSTBACA. 117 



Carapace nearly smooth. A spine external to the orbits. 

 Legs very long. 



Port Jackson, etc. Pound also in New Caledonia. 



215. Mycteris platycheles. 



Mycteris platycheles, M.-Edw., Ann. Sci. JSTat., t. xviii., p. 154. 



Carapace covered with small prominent granular points ; a 

 dentated crest external to the orbits. Legs shorter than in the 

 preceding species. 



Tasmania (north coast) ; Port Western ; Botany Bay. 



Sub-Tribe Oxtstomata. 



Carapace varying greatly in shape, transverse, arcuate anter- 

 iorly or sub- globose. Branchiae 7-9 in number. Antennary 

 region very small, antennae minute. Epistome rudimentary. 

 Buccal cavity more or less triangular in outline, produced and 

 narrowed anteriorly. Efferent channel passing out at the middle 

 of the palate which is produced forwards. Male genital appen- 

 dages inserted in the basal joint of the fifth pair of legs. 



Family I. LEUGOSIIB^E. 



Afferent canal to the branchiae entering at the antero-lateral 

 angle of the palate. Crenital appendages of the male exserted 

 from the sternum. Terminal joints of the external maxillipedes 

 concealed by the preceding. Legs gressorial. 



Genus Leucosia, Pabr. 

 Carapace ovate-orbicular, sub-globose, smooth ; front sub- 

 produced, covering the antennulary fossae. Orbit with three 

 fissures. External maxillipedes having the palp parallel-sided, 

 straight, or slightly curved, obtuse ; the endopodite acutely 

 triangular. Anterior limbs rather stout, of moderate length, 

 arms tuberculated at the base and sides ; fingers slender. Four 

 posterior pairs of legs becoming successively shorter from the 

 second to the fifth. Abdomen of the male in some species with 

 all the segments united, the first and the last excepted, in others 

 the third joined with the fourth, and the fifth with the sixth. 

 Abdomen of the female with the third to the sixth segments 

 united. [-B.] 



