278 AUSTBALIAIT MALACOSTBACA. 



length, longer than the others ; flagellum composed of about 

 twenty articuli. Length If in. 



Tasmania (Australian Museum). 



Allied to I. elongata, Miers, but having the thorax very much 

 broader in proportion to the length. 



Genus Cbabyzos, Spence Bate. 



Head and pereion of equal breadth, the first segment of the 

 pereion joined to the head. Upper antennae not longer than 

 the cephalon. Lower antennae much longer than the upper. 

 Pereiopoda simple, the dactyli terminating in two teeth ; all the 

 pereiopoda except the first slender and short. [&. B.~] 



481. Crabyzos longicaudatus. 



Crabyzos longicaudatus, Spence Bate, Proc. Zool. Soc, 1863, 

 p. 504, pi. xli, fig. 7. 



Pleon terminating in a long point. First segment of the 

 body equal to the head. Superior antennas shorter than the 

 head j inferior antennae as long as the second segment of the 

 pereion. First pair of pereiopoda tolerably robust and long, all 

 the rest shorter and feebler, all terminating in double-pointed 

 dactyli. [S. £.] 



Gulf of St. Vincent, 4| fathoms. 



Sub-Tribe Ohtscoidea. 



Body usually oblong or oblong-oval, terminal segment not 

 greatly developed. Posterior pair of abdominal appendages 

 usually styliform, rarely obsolete, terminal or sub-terminal 

 (never closing over the other branchial appendages as in the 

 Idoteidce, or large, lamellate, and natatorial as in the Cymo- 

 thoidw). [M.] 



Family ABMADILLIDM 



Body very convex, closely articulated. Abdomen multi- 

 articulate, the last segment small. Caudal appendages lamellate, 

 not exserted beyond the abdomen. Mandibles without palp. 

 Internal antennas inconspicuous. [D.] 



