KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 



1 1 3 1 4 1 3 1 1 



403 



Sp. 9. Length of the animal 7 mm. S. Atl. 



Sp. 10. 

 Sp. 11. 

 Sp. 1,2. 

 Sp. 13. 

 Sp. 14. 

 Sp. 15. 



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» 7 mm. Trop. Pae. 



» 8 mm. Trop. Pac. 



» 9 mm. Trop. Atl. 



» 10 mm. Ind. Oc. 



» 11 mm. Antarct. Oc. 



» 12 mm. S. Atl. 



1 



1 



3l 



3l 



a 2 





1> 



li 



13 



1 1 



I 



12 



14 



13 



ii 



r 



1 



22 



h 



i 



I 



12 



12 



12 



l 



r 



1 



2l 



il 



3l 



I 



13 



14 



I 3 



ll 



r 



12 



12 



13 



1 1 



I 



12 



13 



13 



1 1 



r 



13 



13 



13 



ll 



I 



1 



3l 



4l 



sl 



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2l 



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/ 1 1 2 1 i 1 2 1 



This diagram shows that among these fifteen specimens there is only one, spec. 10, 

 which has exactly the same dentition on the right and left carpus, and that no two of 

 the specimens show the same combination of teeth, although they are closely similar to one 

 another in other respects and belong without doubt to one and the same species. 



In the form and serration of the uropoda there is a similar variation, but more con- 

 nected with the age of the animal, so that the older animals which have attained a length 

 of ten or twelve mm., have the uropoda comparatively much broader than in the young, 

 less distinctly serrated, and hardly emarginated at the apex, while the young have 

 the first and second pairs very narrow, sharp-pointed and finely serrated, and the third 

 pair only a little dilated, sharp-pointed, and deeply eraarginate. 



The male. 



PI. XVII, fig. 23 and 26—40. 



The body is thick and stout, not very much compressed. The integument is thick, 

 of a whitish red or yellowish colour, that of the hind part of the body has a metallic 

 lustre and is feebly phosphorescent. The head and perseon together are much shorter 

 than the pleon and urus together, and about as long as the pleon. 



The head is about a fourth part deeper than long; at the upper front corner it 

 projects into a very short rostrum, which is obtuse, and feebly bent downwards. The 

 front side of the head is feebly excavated, and forms a broad and shallow antennal groove. 



The eyes form only one portion on either side of the head. 



The first pair of antenna? in the full grown male are longer than the head and 

 peraeon together. The first joint of the peduncle is longer than broad, and is more than 



