998 REVISION OP THE AUSTRALIAN LiEMODIPODA, 



segments of the peduncle of the superior pair : the fourth and fifth 

 segments of its peduncle are of nearly equal length, the latter 

 rather longer and more slender than the former ; the liagellum is 

 very short, not being half the length of the last segment of the 

 peduncle ; it is composed of six articuli. The propodos of the 

 anterior gnathopoda has the " palm " undefined. The propodos of 

 the gnathopoda is ovate ; its palm is defined by an acute conical 

 tooth, and it has two other teeth near its distal end, one proximal, 

 acute, the other compressed. The branchije are long oval : the 

 corresponding appendages are distinct, between a third and a half 

 of the length of the branchiae. The posterior pereiopoda have the 

 palm defined by a tooth-like projection. 



The length of the body is over half an inch. 



I have only found this species in Port Jackson. It is a very 

 well-marked species and quite distinct from P. gracilis of Dana, to 

 which Mayer is inclined to unite it, both in the form of the head 

 and of the gnathopoda. The gnathopoda are not unlike those of 

 P. dentata but in other respects the two species are quite difierent. 



Protella echinata. 

 Cajwella echinata. Haswell, Proc. Linn. Soc, N.S.W. Vol. 

 IV., p. 346, pi. XXIII., fig. 2. Cat. Aust. Crust., p. 312. 

 Protella echinata. Mayer, Caprelliden, p 32, figs. 6 and 7. 

 Mayer points out the presence of extremely reduced rudiments 

 of anterior pereiopoda, the presence of which places the species in 

 the genus Protella, of which, however, it must he regarded as an 

 outlying member. 



Protella Hasavelliana. 



Protella ffaswelliana. Mayer, I.e., p. 32, figs. 8-10. 



I append Mayer's remarks on this species : — 



" With Haswell's consent I here describe this Australian species 

 (of which a male and a female are at my disposal), as on account 

 of a peculiarity in its structure it may be regarded as of especial 

 interest. This consists in the coalescence of the last segment of 

 the thorax with the penultimate, the former being thus deprived of 

 independent movement ; at the same time it is so reduced that its 

 pair of appendages lie close up to the base of the preceding pair. 



