10 



OSCAR SUND 



[REP. OF THE "MICHAEL SARS" NORTH 



The eyes reach about to the middle of the 1st 

 segment of the antennular peduncles, the diameter of the 

 cornea being about half the length of the ocular peduncles, 

 which carry on their inner side and near the edge of the 

 cornea a low colourless tubercle, which is seen to receive 

 a branch of the optic nerve. 



The antennular peduncle is slender, about two-thirds 

 the length of the carapace. The first joint is slightly 



shorter than the third, which is about one half longer 

 than the second. The internal flagetlum in the male 

 differs slightly from that in S. rubroguttatus, figured by 

 Wood-Mason 1892. Compare his figure with fig. 9. 



The scaphocerite reaches about to the middle of the 

 third joint of the antennular peduncles. Its outer edge 

 is gently curved from base to tip, and more strongly in 

 the outer half. The terminal spine is short and stout. 



Figs. 6—10. Sergestes corniculum. 6 a) Outer end of third maxilliped, © 3-2, st. 67, y 200. 6 b) The same, $ 17, st. 62, 3 In 3000. 

 7) Outer uropod, $ 15, st. 51, y 300, ('%). 8) Forepart of J 15, st. 51, y 300, ( 5 /i). 9) First antenna, <j" 17, st. 51, y 300, ( 10 /i). 



10) Petasma, J 15, st. 51, y 300, ( 3 %). 



The petasma is strongly and very characteristically 

 developed. In general plan it resembles that of 6". ro- 

 bustus, but the processes c and d are much more devel- 

 oped, while the processes g and / are reduced both in 

 size and armature. Thus the process / in S. corniculum 

 has only a single hook, situated on the tip, while the 

 end of c is broadened and terminates with a row of 

 "claws". Parallel with the terminal row is another, con- 

 sisting of smaller claws. 



The largest individual is a female, 55 mm. in total 

 length, corresponding to a length of carapace of 19 mm. 



Table of sizes. 



Sizes (C) 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



19 



Total 



Males 



Females 



1 



2 







2 



5 



3 



3 



1 



1 

 1 



1 

 3 



1 

 2 



2 

 5 



7 



3 



7 



4 



1 



8 

 30 



Young 



17 







This beautiful species was taken at most stations, 

 except those situated in the NE quadrant of the area 

 investigated, 55 specimens being procured. 



The bathymetrical distribution is shown in the fol- 

 lowing table. Although the catches are not numerous it 



