ENTOMOSTRACA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 325 



been obtained with other interesting Crustacea in collections made by Dr Bruce m 

 Franz Josef Land, and G. M. Thomson records a variety {E. longicauda var. antarctica, 

 G. M. Thorn.) from New Zealand; and another species— £". robusta, Giesbrecht— is 

 recorded from the Mediterranean. The form described above resembles the species last 

 referred to, but appears to differ in one or two minor points, such as in the armature 

 of the first and fourth pairs of thoracic legs and in the proportional lengths of the 

 abdominal segments. 



Hahitat.—Hcotia Bay, South Orkneys, June 1903; Station 325, 60° 43' 42" S., 

 44° 38' 33" W. 



Fam. LiCHOMOLGiD^. 

 Genus Lichomolgus, Thorell, 1859. 

 Lichomolgus fucicola, G. S. Brady. (PI. XII. figs. 23-26.) 



1872, Macrocheiron fucicoluiii, Brady, Nat. Hist. Trans. Nurtlmmb. and Durham, vol. iv. p. 434, 



pi. xviii. figs. 9-18. 

 1880, Lichomolgus fucicola, Brady, Mon. of the Free and Semi-parasitic Gopepoda of the British Islands, 



vol. iii. p. 41, pi. Ixxxv. figs. 1-11. 



A few specimens of this species were obtained from some floating seaweed 

 collected by the s.y. Scotia in July 1904; Station 539, 33° 53' N., 32° 27' W. 

 The roughly serrated margin of the strongly curved claws— terminal claws — with 

 which the female antennse are armed, seems to be characteristic of this Lichomolgus 

 {see fig. 24). 



The antennules are composed of seven joints, the third joint being the smallest (fig. 

 23). The inner branch of the fourth pair of thoracic legs is short and biarticulate, the 

 two joints being subequal, and the end one furnished with two terminal seta3. 



The fifth pair are uniarticulate, tolerably elongated, and narrow (fig. 25). Caudal 

 rami about as long as the last abdominal segment. 



The distribution of Lichomolgus fucicola appears to be extensive. It has been 

 recorded from several British localities, usually from the laminarian zone, where it lives 

 apparently about the roots and among the fronds of the seaweeds, such as Laminaria. 

 This is one of the more easily identified members of the genus. 



Genus Pseudanthessius, Claus, 1889. 

 Pseudanthessius fucicolus, new species. (PI. XII. figs. 1-13.) 



Description of the Female. — In its general appearance, the female of this species 

 resembles Lichomolgus hirsutipes from the Firth of Forth, and, but for the difterence 

 in the structure of the fourth pair of swimming feet, it might be referred to that 

 genus. 



The antennules, which are composed of seven joints, have the second one rather 

 longer than the others, while the third is the smallest ; the next four joints gradually 



(ROY. SOC. EDIN. TRANS., VOL. XLVIIL, 571.) 



