il';v. T. U. K. Stcbbln^ on drctic CrustaGe't. 13 



Tiibo F I. A n !•: 1. 1- 1 r e u a. 

 Fam. AnthuridaB. 



Genua Calathuua, Norin.m anl Stebbing, 1886. 



188G. Calathnra, Xormnn iind Stubbing, Trans. Zool. Soc. I.o.idoii, 



vol. xii. pt. 4, p. \'2'2. 

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



To this genus Sara as^i'^ns three species — Stimpsoii's 

 Ant Intra brachiatay his own P'tranthnru 7ioi'vi\fjica, 1872, and 

 Honnier's Cahitlntra affinis^ 1896. I^ut the last ot" these three 

 shouKl bo referred to the genus Lcphinthura, Sars, 1.S97. 

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

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

 ance with the view separately propounded by Dr. Anton 

 Dolnn \'or Paranth lira Co^tnna, nud by Dr. Charles Chilton* 

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

 ramus is articulated near the base of the peduncle and there 

 is the ])o.ssibility that the elongate jjoduncle 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). 



18d3. Anthura hrachiata, Stiinpson, Marine Invertebrata of Grand 

 Manan, p. 43. 



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

 yard SouikI. p. 573. 



1875. Puranthura arctica, Ilellor, Donk. Ak. Wien, vol. xxxvi. p. 3S 

 (14), pi. iv. ^s. U-12. 



1880. Calathura hrachiata, Norman and Stebbing, Trans, Zool. Soc. 



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

 1807. Calathura hrachiata, Sars, Crustacea of Norway, vol. ii. p. 46, 



pi. xix. lig. 2. 



Heller accurately describes the uroj)ods in agreement with 

 Dohrn and Chilton, but, like Gerstaecker, he regards the up[)er 

 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 ap[)eal to embryology. 



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

 71° ai' N., 4.U° 12' E., in 76 fathoms. 



• Trans. Linn. Soc. London, 2nd ser. Zool. vol. vi. pt. 2, p. 317. 



