REPORT ON THE AMPHIPODA. 1245 



1885. Protella, Cams, Prodromus Fauna MediterraneEe, pars ii. p. 387. 

 1884-5. „ Chilton, Proc. Linn. Soc. N.S.W., vol. ix. pt. iv. (extract), p. 8. 



1885. „ Haswell, Proc. Linn. Soc. N.S.W., vol. ix. pt. iv. (extract), p. 5. 



1886. ,, Fowler, Fauna of Liverpool Bay, Report 1, p. 217. 



For the original definition of the genus, see Notes on Dana, 1852 (pp. 256, 265). It 

 may now be defined as follows : — 



Mandibles with a three-jointed palp. 



Lower Antennae with a two-jointed flagellum ; devoid of motor-setae (Ruderhaare). 



The two pairs of Gnathop>ods and three hinder pairs of Peraeopods well developed ; 

 the First and Second Perieopods rudimentary, consisting of a single joint. 



Branchial Vesicles only on the third and fourth segments of the perseon. 



Pleon two-jointed. 



Uropods rudimentary, neither pair produced beyond the end of the pleon. 



The definition given by Mayer has been a little enlarged with a view *to the new- 

 genus Protellopsis. Haswell, in describing Protella australis in 1885, says that the 

 flagellum of the lower antennae " is composed of six articuli," without noting that this is 

 contrary to Mayer's definition of the genus, which he apparently accepts. 



Protella gracilis, Dana. 



1852. Protella gracilis, Dana, U.S. Explor. Exped., vol. xiii. pt. ii. p. 812, pi. liv. fig. 2, a-f. 



1862. „ ,, Spence Bate, Brit. Mus. CataL Amph. Crust., p. 352, pi. iv. fig. 5. 



1880. „ australis (?), Haswell, Proc. Linn. Soc. N.S.W., vol. iv. p. 276, pi. xii. fig. 4. 



1882. „ ,, Haswell, Catal. Australian Crustacea, p. 311. 



1882. ,, gracilis, Mayer, Die Caprelliden, p. 31. 



1885. ,, australis (?), Haswell, Proc. Linn. Soc. N.S.W., vol. ix. pt. iv. p. 5 (separate copy), 



pi. xlix. figs. 2-4. 



A female specimen ; the head and body smooth ; the convex dorsal line of the 

 head longer than the dorsal, equal to the ventral, line of the coalesced first segment of 

 the perseon ; the second segment of the perseon about equal in length to the third, the 

 third a little longer than the fourth, the fifth longer than any of the three preceding, 

 considerably longer than the next two united, the sixth dorsally little if at all longer 

 than the seventh ; the pleon extremely short and small. 



Eyes round, not very large, but with from eighty to a hundred ocelli in each. 



Upper Antennas. — The first joint longer than the head ; the second joint more than 

 twice as long as the first, smooth-edged ; the third about as long as the second, narrower, 

 slightly notched for setules ; the flagellum slender, not so long as the third joint of the 

 peduncle, of about twenty-one joints, each carrying an apical filament (the last joint 

 perhaps excepted) and some setules. 



Lower Antennae not nearly so long as the peduncles of the upper, but longer than the 



