FROM CHRISTMAS ISLAND, 285 



species are tlie deep ceplialon with eyes rather small and set far 

 apart, the abdomen widest at its posterior third (without furca) 

 and usually bearing two spermatophores, the furca contained 

 2t times in the rest of the abdomen, the middle furcal seta thick 

 and equal in length to the width of the furca, and the setose pad 

 on the antero-ventral pai-t of the abdomen. 



Wolfenden (11. p. 1027) has described at some length a female 

 Coryca'us which occurred plentifully in the Maldive collections, 

 and which is apparently identical with the above. He ascribes 

 it to G. peUucidus Dana, and records C. gibbulus as a separate 

 species. He remarks, however, that he believes that the C. pel- 

 htcidus of the IMaldive collections is probably identical with 

 0. gibbulus. His figure of the fourth foot (fig. 9, pi. xcix.) is 

 evidently incorrect in showing an endopodite bearing a long seta, 

 as in the text it is said that no endopodite is present. 



Giesbrecht's (10) figure of the female abdomen of C. gibbulus in 

 lateral view is not so deep nor so irregular in outline as are all 

 my specimens ; in this they agree more nearly Avith Wolfenden's 

 figure, but I think thei-e can be no doubt that all these forms are 

 identical. 



It seeins ]iot improbable that Willemoes-iSuhm's C. onegalops 

 was in reality this species, but his description and figure, as 

 given by Brady (1), can hardly be regarded as constituting a valid 

 diagnosis. Bi'ady's C. peUncidtcs may also include it with others. 



Distribution. Red Sea, Arabian Sea, Indian Ocean (many 

 recoiTls), and Tropical Pacific. 



CORYCELLA BREVIS, Sp. n. (PI. X. figS. 1-6, PL XI. fig. 7.) 



Female (PI. X. figs. 1, 2). — Length -85 mm. ; cephalothorax, 

 in middle line, '54 mm. ; abdomen and furca -3 mm. ; cephalon 

 rather deep, curved doi'sally in lateral view ; eyes large, pro- 

 minent in dorsal view. 



2nd thoracic segment with slight dorsal hump, as in C. gihbula 

 and ( \ longicmtdis. 



3rd thoracic segment (PL X. fig. 6) with comparatively short 

 lateral points. 



Abdomen widest at its posterior | excluding furca ; in lateral 

 view the abdomen is parallel-sided for about 4' of its length, and 

 is then tapered to the furca ; it has a slightly spinulose antero- 

 venti'al boss. 



Fui"ca about 6 x 1, contained 21 times in rest of abdomen ; its 

 median terminal spine not very strong, about twice as long as 

 width of furca. 



1st and 2nd antennse (PL XI. fig. 7) as in C. gibbula. 



1st to 3rd feet (PL X. figs. 3, 4) .almost the same as in C. gihbula. 

 The 3rd joints of the exopodites of the 1st .and 2nd feet are 

 finely serrate, in the 3i-d foot the serrations are not visible. 



4th foot (PL X. fig. 5) as in (■. gihbida. hollowed on distal 

 margin of 2nd basal ; inner margin of the 2nd basal forms an 

 acute angle with its base. 



