BY WILLIAM A. HASWELL, M.A., B.SC. 109 



The female differs from the male (1) in having the body broader 

 (2) in the form of the posterior gnathopoda. (Figs. G and 7.) 



Dexiocerella dentata. 

 (Plate XVII, figs. 8-12.) 



CyrtopJiium dentatum, Haswell, Proc. Linn. Soc, N.S.W., Vol. 

 IV, p. 342, pi. XXIL, fig. 5. Cat. Aust. Crust., p. 272. 



In this species the superior antennse have a well-formed flagellum 

 of six to eight articuli, and an appendage consisting of sevei'al 

 coalescent joints ; they are much smaller than the inferior pair, 

 the flagellum of which has four segments — the last rudimentary. 

 The propodes of the posterior gnathopods have near the base of 

 the dactylos a conical tooth and a denticulated lobe ; these are 

 very small in specimens from Port Jackson, but much larger in 

 specimens from Victoria ; the merus, carpus and propus are 

 densely clothed with pinnate hairs. 



The females differ from the males in having the processes of the 

 pleonal segment less prominent, the inferior antennse shorter, and 

 the posterior gnathopoda much smaller, with the palm of the propus 

 unarmed. These characteristics aie much more strongly marked 

 in young females, in which the dorsal processes may be entirely 

 absent and the inferior antennae very little longer than the superior. 



Cyrtophium minutum. 



(Plate XVIII., figs 1-5 and fig. 9.) 



Cyrtophium minutum^ Haswell, Proc. Linn. Soc, N.S.W., 

 Vol. IV, p. 343, pi. XXIL, tig. 6. 



In this species the antennse are subequal, the superior pair 

 having no appendage ; the flagellum of the superior pair contains 

 seven joints — the first four of these being cemented into one piece 

 and the next thi-ee into another. 



