Rev. T. R. R. Stebbing on Arctic Crustacea. 13 



Tribe Flabellifera. 

 Fam. Anthuridae. 



Genus Calathura, Norman and Stebbing, 1886. 



1886. Calathura, Nnrman and Stebbing, Trans. Zool. Soc. London, 



vol. xii. pt. 4, p. 122. 

 1897. Calathura, Sars, Crustacea of Norway, vol. ii. p. 44. 



To this genus Sars assigns three species — Stimpson's 

 Anthura hrachiata^ his own Piiranthura norvegica, 1872, and 

 Bonnier's Calathura affinis^ 1896. But the last of these three 

 should be referred to the genus Leptanthura, Sars, 1897. 

 It is, I think, quite certain that in the genus Calathura tlio 

 inner ramus of the uropoda is not biarticulate, but, in accord- 

 ance with the view separately propounded by Dr. Anton 

 Dohrn iov Par anthura Costana, and by Dr. Charles Chilton* 

 for the Anthuridai in general, only one-jointed. The outer 

 ramus is articulated near the base of the peduncle and there 

 is the possibility tiiat the elongate peduncle includes a 

 coalesced first joint of the inner ramus, but, at least in Cala- 

 thura, the homology of such a first joint is not proved either 

 by perceptible suture or power of movement. 



Calathura hrachiata (Stimpson). 



1853. Anthura hrachiata, Stimpson, Marine Invertebrata of Grand 

 Manan, p. 43. 



1874. Anthura hrachiata, Harger, in Verrill and Smith's Invert, Vine- 

 yard Sound, p. 573. 



1875. Paranthura arctica. Heller, Denk. Ak. Wien, vol. xxxvi. p. 38 

 (14), pi. iv. figs. 9-12. 



1886. Calathura hrachiata, Norman and Stebbiug, Trans. Zool. Soc. 



London, vol. xii. pt. 4, p. 131, pi. xxvi. fig. 1. 

 1897. Calathura hrachiata, Sars, Crustacea of Norway, vol. ii. p. 46, 



pi. xix. fig. 2. 



Heller accurately describes the uropods in agreement with 

 Dohrn and Chilton, but, like Gerstaecker, he regards the upper 

 ramus as the inner instead of the outer, a problem in homology 

 which, as Dr. Chilton suggests, can perhaps only be deter- 

 mined by an appeal to embryology. 



A single specimen, 1 inch long, was obtained at or near 

 71° 31' N., 49° 12' E., in 76 fathoms. 



* Trans. Linn. Soc. London, 2ud ser. Zool. vol. vi. pt. 2, p. 317. 



