STEBBING— ISOPOD A 105 



have six sharp serrate spines on hind margin of the fourth joint, five on the fifth, and 

 five on the sixth, the fourth in the last set being longer than its successor. The finger 

 has a strong spine at apex of hind margin and a strong unguis. 



Length about 1 1 mm. One specimen is slightly longer, but not approaching an inch, 

 the measurement of Haswell's longest specimen. Milne-Edwards gives the length as ten 

 lines*. 



Localities. Zanzibar channel, from 10 fathoms depth, taken by Mr Crossland in 1901, 

 and at Wasin in 1902. 



20. Cymodoce Zanzibar crisis, n. sp. (Plate 9 d.) 



This species is nearly allied to Cymodoce pilosa, Milne-Edwards, first described from 

 the Mediterranean, to the Australian C. aculeata, Haswell, and to C. longistylis, Miers, 

 from Thursday Island and Singapore. It agrees with the disposition of the hairiness and 

 granulation of the body and with the characters of the uropods assigned by Milne-Edwards 

 to his species. It would be almost superfluous here to describe the mouth-organs because 

 they correspond so thoroughly with the figures which Hansen has given for those parts 

 in the male of C. irilosa (Quarterly J. Microsc. Sci., vol. xlix., pt. 1, pi. 7, figs. 1 a — f). 

 But the ornamentation of the pleon is as follows, — at the base on either side is a large 

 flat lobe fringed with setae ; between these lobes runs a curved row of teeth, of which the 

 submedian are the largest ; flanking this pair to the rear is a much more conspicuous pair, 

 behind which again is a pair of deeply bifid well separated processes, of length about equal 

 to the breadth ; the ends of their teeth reach a circular rose-coloured boss, fringed with 

 setules but almost smooth at the top. It is interesting to note that in all our three 

 specimens which have been in preservative liquid for seven or eight years the colouring 

 of this boss has remained constant, but whether it was the same in the living animal 

 I have no means of knowing. Behind the boss what may be described as a quadrate 

 emargination is occupied by a broad setose apical piece, which narrows near the end to 

 a feebly bifid or in one specimen a feebly trilobed termination, reaching a little beyond the 

 bluntly pointed setose lateral apices. The uropods agree nearly, not only with those of 

 C. pilosa, but also with Haswell's description of those in C. acideata, at least as modified 

 by Whitelegge (Mem. Australian Mus., vol. iv., pt. 4, p. 262, 1902), though in each case 

 there are small differences, such as might be explained away, were there no other 

 divergences between the species. In C. longistylis Miers records that " the rami of the 

 uropoda are narrow, entire, nearly straight, and rather densely hairy ; the outer rather 

 shorter than the inner ramus, and more acute at its distal extremity; the inner long, 

 projecting by about half its length beyond the terminal segment " (Zoological Collections 

 of the "Alert," p. 306, pi. 33, fig. c, 1884). The figure of the inner ramus represents 

 it as much curved, but both figure and description agree in giving it a relative prolongation 

 which will not agree with our species. 



With regard to the masculine appendix in the second pleopods of C. aculeata, 

 Whitelegge describes it as " a slender stylet about one third longer than the ramus ; 

 in its basal two-thirds the stylet is fusiform, and the terminal third is cylindrical, and 



* Twelve lines equal one inch in the old measurement. 

 SECOND SERIES— ZOOLOGY, VOL. XIV. 14 



