92 



Records of the Indian Museum. 



[Vol. X, 



Three of the specimens examined possess five dorsal teeth on 

 the rostrum ; in the other two there are only four. 



The mandible agrees closel}^ with Baker's figures; but the 

 second segment of the palp is as broad as long. A small ridge at 

 the base of the palp is all that remains of the incisor-process. 



The processes on the thoracic sternum of the large male 

 (fig. 5) consist of (i) a sharp upstanding keel between the third 

 and fourth pairs of peraeopods, (ii) a pair of acute backwardly 

 directed teeth between the fourth and fifth pairs, and (iii) a con- 

 spicuous plate, very deeply bifurcated anteriorly, behind the base 

 of the last pair. In small males and in an ovigerous female the 

 processes are similar, but the anterior bifurcation in the plate 

 behind the fifth peraeopods is much less pronounced. 



The endopod of the first pair of peraeopods is, in the male, 

 unequally bifid at the apex ; in the female it is simple and ends 

 acutely. 



In the large male example the third maxillipedes are as long 

 as the entire length of the animal (measured from the tip of the 

 rostrum to the apex of the telson), though in other males and 

 in the female they are less than half the same proportional length. 

 The five specimens yield the following measurements: — 



The phenomenon is doubtless precisely similar in nature to 

 that already discussed in the case of Saron marinoratus. It is to be 

 noted, however, that in males of Saron and also, according to 

 Mier's figure, in those of A. palpalis, the first peraeopods grow 

 pari passu with the outer maxillipedes, whereas in A. australis the 

 latter alone appear to affect an extreme development. The point 

 is one of some interest, but it cannot be decided until large collec- 

 tions of both species have been examined. 



The specimens of A lope australis in the Indian Museum were 

 all found at one locality. 



^4o" Arrakan coast, I-ower Burma. \V. Theobald. hive, 22-4.4 '"'ii' 



The species has hitherto been recorded only from the 

 Australian Coast, from Port Jackson (vStead), Kangaroo I., Smith's 

 Bay (Baker) and vSydney (McCulloch). 



