1608 THE VOYAGE OF H.M.S. CHALLENGER. 



1862. Rhabdosoma Wliitei, Spenee Bate, Brit. Mus. Catal. Anipk. Crust., p. 345, pi. liv. fig. 7. 1 

 1871. ,, armatum, Glaus, Unters. iiber den Bau unil die Verwaurlschaft der Hyperiden, 



p. 155. 

 1878. ,, wliitei, Streets, Proc. Acad. Nat. Sci. Philad., p. 287, figs. 6, 6«, 6b. 



1878. ,, armatum, Streets, Proc. Acad. Nat. Sci. Philad., p. 288. 



1878. ,. longirostris, Streets, Proc. Acad. Nat. Sci. Philad., p. 290. 



1879. ,, armatum, Claus, Die Gattungen und Arten der Platysceliden, p. 51. 



1887. Rlwbdonecles armatus, Bovallius, Systematical List of Amph. Hyper., Bihang till K. 



Svensk. Vetensk.-Akad. Handl., Bd. 11, No. 16, p. 39. 

 1887. ,, Whitei, Bovallius, Systematical List of Amph. Hyper., Bihang till K. 



Svensk. Vetensk.Akad. Handl, Bd. 11, No. 16, p. 39. 

 1887. Rhabdosoma armatum, Claus, Die Platysceliden, p. 74, Taf. xxv. figs. 2-8, Taf. xxvi. 

 1887. „ investigator is, Giles, On Six new Amphipods from the Bay of Bengal, Journ. 



Asiat. Soc. Bengal, vol. lvi. pt. ii. No. 2, p. 219, pi. iv. 



Rostrum seven-tenths of an inch long, the total length of the head being one inch ; 

 the perseon four-tenths of an inch long, with the first segment very short, and the 

 seventh like the second much shorter than any of the intermediate segments ; the 

 first three segments of the pleon together not so long as the perseon, in their slightly 

 curved position measuring three-tenths of an inch ; the remainder of the animal to the 

 apex of the telson three-quarters of an inch long ; the fourth segment much longer 

 than any of the preceding, longer than the following double segment ; the postero- 

 lateral angles of the third pleon-segment very acute, much more produced than those of 

 the two preceding segments. 



Lower Antennas and Mandibular Palps not present. The Second Gnathopods and 

 first four pairs of Perseopods with branchial vesicles. The third and fourth joints in 

 the First and Second Perseopods rather dilated, this being the case also in a less degree 

 in the Third Perseopods, in which the first joint is noticeably longer than the third ; 

 the Fourth Perseopods are rather shorter than the Third, with none of the joints 

 dilated ; the lower part of the seventh segment of the perseon corresponding with the 

 side-plate of the fifth perseopods forms behind a forward-directed hook such as Claus 

 figures for this part of the female. 



Uropods. — Peduncles of the first pair much longer than the double segment, many 

 times longer than the one remaining ramus ; peduncles of the second pair shorter than 

 those of the first, but longer than the double segment, the outer ramus more than half 

 the length of the inner, the inner coalesced with the peduncle and less than a quarter 

 of its length; peduncles of the third pair more slender than those of the first, about as 

 long ; the outer ramus rather more than half the length of the inner, longer but more 

 slender than the inner ramus of the second pair ; the inner ramus about a third of the 

 length of the peduncle and coalesced with it. 



Telson linear, elongate, a little but quite distinctly longer than the third uropods, 



1 K curvicorne on Plate. 



