M ME. T. SCOTT ON ENTOMOSTRACA 



HeterochcBta spinifrous occurred in 20 tow-nettings ; only one of these was a surface 

 gathering collected during the day, the other nineteen were under-surface and I'anged 

 in depth from 5 to 4G0 fathoms ; fifteen of these were day collections, and four night 

 collections, as shown in the formula : — 



r 1 sm-face 1 day collection. 



Tow-nettings 20 < r 15 day collections. 



U9 nnder-surface | 4 ^;^„^^ ^litto. 



This, though generally distributed, was a somewhat rare species in the ' Buccaneer ' 

 collection. The dilated outer branches of the fourth pair of swimming-feet, with their 

 short terminal spines, and the extremely long and slender seta of the right caudal 

 stylet, allow of its being readily distinguished from most other species. 



Genus Leuckartia, Glaus. 



Leuckartia, Claus, Die freilebenden Copepoden (1863). 



Leuckartia plavicornis, Claus. 



1863. Leuckartia flavicornis, Claus, loc. cit. p. 183, pi. xxxii. figs. 1-7. 

 1883. Leuckartia flavicornis, Brady, op, cit. p. 50, pi. xv. figs. 1-9, 16. 



Habitat. Station 2, 25 fathoms, January 1st (night collection). Off Accra, surface 

 tow-netting, January 16th (night collection). Lagoon, Sao Thome Island, surface 

 tow-netting, January 27 th (night collection). Station 23, 10, 20, 85, 135, 185, and 235 

 fathoms tow-nettings, February 5th (day collection). Bananah Creek, Congo River, 

 surface tow-netting, February 7th (day collection). 



This Leuckartia was observed in 67 tow-uettings ; 30 of these were surface gatherings, 

 and 37 under-surface. The under-surface tow-nettings were from various depths, from 

 10 to 460 fathoms. Seven of the surface and 27 of the under-surface tow-nettings 

 were day collections, the others were night collections, as exhibited by the annexed 

 formula : — 



r 7 day collections. 

 r30 surface I 23 night ditto. 



Tow-nettmgs 67 < ro7 i r++ 



L37 under surface [ ^^ ^'^^^ d^"*^- 

 L 10 night ditto. 



This species appears to have been widely distributed throughout the area examined 

 during the ' Buccaneer's ' expedition, but comparatively few specimens were observed in 

 the tow-nettings in which it occurred, except in those from deep water. 



Genus Undina, Dana. 

 Undina, Dana, Proc. Amer. Acad. Sci. (1849). 

 Undina vulgaris, Dana. 

 1852. Undina vulgaris, Dana, Crust, of U.S. Espl. Exped. p. 1092, pi. Ixxvii. fig. 8, a-d. 



