104 PERCY SLADEN TRUST EXPEDITION 



at the sides rather convex. Its hind margin deeply excavate in the middle, not extending 

 further back than the rami of the uropods. 



"This species is very near in some characters to Cym. gaudichaudii, but in others 

 to Cy. trigonocephalam. 



"Length 38 mm. Greatest breadth 14 mm." 



The specimen described by Schiodte and Meinert in the "virgo" stage differs 

 apparently from the ovigerous female as described by Bianconi and as seen in our specimen 

 by having the whole length carinate, the first person segment much the longest, and 

 especially by having the uropods much longer than and extending much beyond the 

 telsonic segment. In our specimen the uropods scarcely reach the distal margin of the 

 telson, which is 12 mm. broad by 4 mm. long at the centre and nearly 6 mm. at the longest 

 part of the lateral surfaces. It should be noticed that the carination besides being partial, 

 is nowhere sharp. 



Length of specimen to centre of telsonic segment 28 "5 mm. Breadth at sixth perseon 

 segment, where it is widest, 13 # 5 mm. 



Locality. Seychelles, 34 fathoms. 



Fam. Sphaeromidae. 



1905. Sphreromidae, Stebbing, Herdman's Pearl Fisheries, Suppl. Rep. 23, p. 29. 

 1905. Sphoaromida:, Hansen, Quarterly J. Microsc. Sci., vol. xlix., pt. 1, p. 69. 



Gen. GY MO DOGE, Leach. 



1814. Cymodoce, Leach, Edinb. Encych, vol. vii., p. 433. 



1905. Cymodoce, Hansen, Quarterly J. Microsc. Sci., vol. xlix., pt. 1, p. 120. 



19. Cymodoce pubescens (Milne-Edwards). 



1840. Spheroma pubescens, Milne-Edwards, Hist. Nat. Crust., vol. hi., p. 209. 

 1881. Cymodocea pubescens, Haswell, Proc. Linn. Soc. N. S. Wales, vol. v., p. 473, 

 pi. 17, figs. 1, 1 x. 



1905. Cymodoce pubescens, Hansen, Quarterly J. Microsc. Sci., vol. xlix., pt. 1, p. 122. 



Mr Crossland's specimens warrant the specific name by being covered dorsally with 

 a kind of velvet pile, consisting of pellucid, short, club-shaped setas, much like those 

 which I have described on the South African Dromiid crab Dynomene platyarthrodes. 

 The remarkable metamorphosis of the mouth-parts in the female of this genus, to which 

 Hansen has called attention, is exhibited in the present species, and its pleopods also 

 satisfy the requirements of the Cymodicini, one of Hansen's sections of his group 

 Sphserominae hemibranchiata?. An easily observed character of the species is the 

 strongly marked notch on the outer margin of the outer ramus of the uropods. In the 

 specimen dissected the first antennae have a flagellum of seventeen joints, the first 

 being much the longest ; the second antenna? have an eighteen-jointed flagellum. As 

 in C. pilosa, figured by Hansen, the first joint of the mandibular palp is the longest, 

 but in the maxillipeds the plate of the second joint differs a little, being obliquely 

 truncate on the distal margin which is beset with a few sjiinules. The first gnathopods 



