332 RKV. T. U. R. STEBIilXG ON CRUSTACEA 



having a tclson in minute agreement with that figured l)y Sai's 

 for the Cyrtojiia hirva of his species above-named. His descrip- 

 tion of the telson says, " The michlle projection of its extremity 

 (fig. 29) is considerably pi-oduced, but narrowly truncate at the 

 tip ; and of the seven original spines, three only remain. Of the 

 tlu-ee outer spines, the innermost on either side is much larger 

 than the others, and has assumed the chai'acter of the subapical 

 spines," The outermost, as sliown in the figure 29 is microscopic, 

 and in the upper part of the telson but below the middle (not 

 included in fig, 29) there is another microscopic pair. The cara- 

 pace has a denticle on each side below the middle. The first legs 

 in the Falkland specimen, however, have not attained the same 

 relative length as that shown in fig. 25 of the ' Challenger ' 

 report. In various papers H, J. Han.sen makes N. rostratas a 

 synonym of JSF. inicrops Sars, On this I am not presuming to 

 pass an opinion, but retain the name rostratus for the better 

 identification of the Falkland Island specimen with the ' Chal- 

 lenger' Gyrtop'm form. 



ISOPODA ANOMALA. 

 (or Apseudacea). 



Family Tan aid. E. 



See Proc. Zool, Soc, 1914, p, 348, and add for the present 

 purpose : — 



1884, Tanaidm Studer, ' Gazelle' Isopoden, p, 24. 



188G. „ Beddard, Rep, Voy, ' Challenger,' vol. xvii. 



Part 48, p. 119. 

 1914. „ Barnard, Ann. S. Afr. Mus. vol. x. pt, 11, 



p, 331 a. 



Genus Tanais Audouin & M. Edwards, 1829. 



Tanats nierstraszi, sp. n. (PI. IV.) 



The present species belongs to that division of the genus in 

 which the pleon has six segments. In having the last three 

 abruptly narrowed it agrees with T. normani Richardson, 

 difi'ering from it by having the ramus of the uropods 10-jointed. 

 In this respect it stands between the large blind T. tville^noesii 

 Studer, which has 8 joints, and 1'. hirsutus Beddard, which 

 has, including peduncle, "about 12," From the latter, taken 

 " off Prince Edward Island ; depth 50 to 150 fathoms," it appears 

 to be distinguished by the very difterent proportions of many of 

 the body segments. 



The eyes are dark, piriform, at the rounded angles of the 

 cephalothorax, which has a broad front with short rostrum, and 

 gradually attains a breadth at least equal to the length. The 



