198 AUSTEALIAN MALACOSTBAGA. 



squame, with a spinif orm outer apex ; flagellum not longer than 

 the peduncle. Appendages of the antennae not shorter than the 

 rostrum. Third, fourth, and fifth pairs of feet subprehensile — 

 the dactylus capable of being retracted against the side of the 

 penultimate joint. Abdomen strongly geniculate, the third 

 segment armed with a very obtuse carina, the sixth segment very 

 long. Subpellucid, ornamented with yellow lines and black dots. 

 Length 1 in. [Stimps.] 



Port Jackson. 



Sub-Tribe Pen.eidea. 



Carapace without sutures. External, antennas with a large 

 basal squame. Feet of the first and second pairs not thicker 

 than the third, the third often rather thicker, longer, and chelate ; 

 rarely all the legs weak and slender, the third either obsoletely 

 chelate or completely vergiform. 



Family PBN^IBM. 



Three anterior pairs of legs chelate, longer than the rest, and 

 more or less stronger. 



G-enus Pen-jetts, Latr. 



Three anterior pairs of feet linear ; two posterior pairs not 

 annulated. Carapace with a long ensif orm rostrum. Abdominal 

 feet with two laminse. External maxillipedes palpigerous. 



370. Penseus canaliculars. 



Palwmon ccmaliculatm, Olivier, Encycl., viii., p. 660 (1811). 



Penceus canaliculatus, M.-Edw., Hist. Nat. Crust., ii., p. 414 

 (1837) ; De Haan, Eaun. Japon., Crust., p. 190 (1849) ; E. J. 

 Miers, P. Z. 8., 1878, p. 298 ; Has well, Proc. Linn. Soc. N.S.W., 

 Vol. iv., p. 38 (1879). 



Penceus plelejus, Hess, Arch, fur Nat., Vol. xxxi., p. 168, 

 pi. vii., fig. 19. 



A median crest, mesially grooved behind, and with a deep 

 longitudinal groove on either side of it continued from the base 

 of the rostrum to the posterior border of the carapace. Eostrum 



