ORAL APPENDAGES OF MARINE ISOPODA. 77 



those between the basipodite and the inner distal lobe, and the shape of the 

 former is scarcely correct. 



The basipodite is rather shorter and wider than in P. wosnesenskii and as 

 wide as the greatest transverse dimension of the epipodite. The five-jointed 

 palp is considerably longer than the basipodite and all the joints wider and 

 longer than in the preceding species, the fifth joint is comparatively much 

 larger than in either of the two species of this genus described above. The 

 inner distal lobe is slightly narrower than in P. wosnesenskii, but otherwise 

 very similar. The epipodite is a large flat, elongated plate, narrowing some- 

 what towards its apical margin, and extending forward to almost the middle 

 of the third joint of the palp. 



Glyptidotea, Stebbing. 

 8. Glyptidotea lichtensteini (Krauss). (PI. 7. figs. 12, 13.) 



Idotea lichtensteini, Krauss, Sudafrik. Crust. 1843, p. 62, pi. iv. tig. 4; Miers, Joum. 



Linn. Soc, Zool. vol. xvi. (1881) p. 64. 

 Glyptidotea lichtensteini, Stebbing, Stli. Afr. Crust, pt. n. 1902, p. 57, pi. 10. 



Stebbing was the first to describe and figure the oral appendages, he 

 states: "First maxilla?. — The outer plate is surmounted by eleven curved 

 spines, the outermost but one being the strongest, the innermost six slender, 

 forming two sets, each consisting of three graduated spines. The inner plate 

 has three plumose setse on the narrow apex. . . . Maxillipedes. — The inner 

 margin of the first joint forms a rounded process beset with plumose setse ; 

 its external part forms a broad base for the large distally narrowed epipod. 

 The second joint is elongate, its apical process, distally fringed with seta?, 

 reaches beyond the second joint of the palp and somewhat above its base has 

 a strong spine-hook, nearly at the level reached by the apex of the epipod. 

 The first joint of the palp is small, the second widened cup-like, with the 

 inner margin much longer than the outer, the third joint similar but larger, 

 and with less difference between the two margins ; the fourth joint is much 

 the longest, oval, but with truncate apex, on which is placed the small, but 

 very distinct, oval fifth joint, this like the three preceding joints having seta? 

 on the inner margin." 



With many other writers Mr. Stebbing does not distinguish between the 

 two divisions of the coxopodite, and the inner distal lobe, which is distinct 

 from the basipodite. 



The First Maxilla (PI. 7. fig. L2). — Tn all the specimens I have examined 

 I find twelve terminal spines on the outer lobe and a large setule, set in a 

 cup-shaped cavity, on the ventral side ; further, on the inner lobe, in addition 

 to the three setose spines, there are two setules, 



