WALKER—AMPHIPODA GAMMARIDRFA. 309 
prominence. Dactylus as long as the palm, with a cavity in the swollen base into which 
the prominence fits when closed (fig. 7, gu.'). 
Gnathopod 2: side plate subangular in front, scarcely deeper than the segment. 
Second joint naked, subequal to the next 3 united and to the hand, but wider than the 
last; 4th joint produced under the 5th, with long sete on the ovate distal margin; wrist 
much wider and rather shorter than the long narrow hand, both furnished on the 
hind surface with long plumose set; palm small but distinct, oblique, irregular, and 
subequal to the serrate finger (fig. 7, gn.”). This limb much resembles gnathopod 2 in 
Leptocheirus, Zadd. 
Perzeopods 1 and 2. Second joint rather longer than 4th and 5th united, which are 
subequal in length and a little narrower than the 2nd; dactylus rather shorter than 6th 
joint. The whole almost naked. 
Perzeopod 3 turned up; 2nd joint twice as long as wide, convex in front, slightly 
convex behind; 4th, 5th, and 6th joints widening distally ; 5th joint longer than 4th. 
Perzeopod 4 longer than 3; 4th joint longer than 5th. 
Per. 5 much longer and more slender than 4; 4th and 5th joints subequal; hind 
margin of 2nd joint fringed with long plumose sete. 
Uropod 8: rami subequal to the peduncle and to each other (fig. 7, w7.). 
Telson seen sideways is roof-shaped, divided along its ridge to the base, with an upright 
spine on each division (fig. 7). 
Length 3°5 mm. 
Though the specimens are from different localities, yet I have no doubt of their specific 
identity. The peculiar gnathopod 2 and telson are sufficient to distinguish it *. 
Genus PHOTIS, Kroyer, 1842. 
38. Photis longicaudatus (Bate & Westw.). 
I. Amirante, E 9, 34 fms.: several. Cargados, B 25, 22 fms.: five. 
Il. Wasin, mud, 10 fms. One 2 ov. 
Length of female with ova 3 mm. 
Genus HURYSTHEUS, Bate, 1857. 
39. Hurystheus zeylanicus ft (A. O. Walker). 
Gammaropsis zeylanicus, A. O. Walker. 
Gammaropsis gardineri, A. O. Walker, young 3. 
I. Egmont, breaker zone: one. Praslin Reef. Coetivy. Amirante. Cargados. 
Length of ¢ from Coetivy 4 mm. 
* Canon A. M. Norman, F.R.S., has called my attention to the resemblance of gnathopod 2 to the same member 
in his genus Ooremapus, from which, however, it differs in the hand of gnathopod 1 in the male.-—May 25, 1908. 
+ Since this paper was read Mr. Stebbing has published a description (Annals of the 8. African Mus. vol. vi. 
pt. i. p. 86, pl. xl. B) of the male of his Hurystheus (Gammaropsis) atlanticus (Chall. Report, p. 1101, pl. 114). 
As E. zeylanicus appears to be a very variable species, especially as regards the hand of the 2nd gnathopod, I now 
consider that it ought to be united to Z. atlanticus (Stebbing).—May 25, 1908. 
4.6* 
