132 AUSTBALIAIT MALACOSTHACA. 



the fingers which are very slender, and armed on their inner 

 margins with fine denticles and a few larger triangular teeth. 

 Posterior limbs slender, cylindrical and smooth. Abdomen 

 (female) ovoid, granulated ; the compound part with no trace of 

 intersegmental lines, but traversed by well-marked longitudinal 

 sulci. Colour nearly white, with a blush of red over the lateral 

 parts of the carapace and the lateral spines, and a band of the 

 same colour on the upper surface of the arm. 

 Darnley Island, Torres Straits (Macleay Museum). 



Genus Ixa, Leach. 



Carapace elliptico-rhomboid, with a sub-cylindrical process 

 arising from the branchial region on either side; regions 

 separated by a deep sulcus. Orbit with two fissures above. 

 External maxillipedes with the palp broad obtuse, longer than 

 the endopodite. Feet all filiform, slender. Abdomen of the 

 female with the last joint produced as far as the oral aperture. 



[-B-] 



253. Ixa inermis. 



Ixa inermis, Leach, Zool. Misc., iii., p. 26, t. 129, fig. 2 ; 

 Milne-Edwards, Hist. Nat. Crust, ii., p. 135. 



Lateral processes unarmed. 



Cape G-renville (Macleay Museum). 



G-enus Pebsephona, Leach. 



Carapace oval or orbicular, depressed, armed posteriorly with 

 two or three teeth. Pterygostomian regions angulated. Orbits 

 with three fissures. Antennulary fossse transverse. External 

 maxillipedes with the palp little dilated, gradually narrowing, 

 truncated internally at the apex. Anterior legs robust, not 

 twice as long as the carapace ; the remaining pairs with the last 

 and penultimate joints compressed. Abdomen of the male with 

 the third to the fifth segments coalescent ; of the female the 

 fourth to the sixth. [.B.] 



254. Persephona tuberculosa. 



Persephona tuberculosa, A. Milne-Edwards, Journ. des Mus. 

 Grodeffroy, Band i., Heft iv., p. 86. 



