332 REV. T. R. R, STEBBING ON CRUSTACEA 



having a telson in minute agreement with that figured by Sars 

 for the Cyrtopia larva of his species above-named. His descrip- 

 tion of tlie telson says, " The middle projection of its extremity 

 (fig. 29) is considei-ably produced, but narrowly truncate at the 

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

 three outer spines, the innermost on either side is much larger 

 than the others, and has assumed the character of the subapical 

 spines." The outermost, as shown 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. "J'he 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. Hansen makes N. rostratus a 

 synonym of iV. microps 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' Cyrtopia ioYxn. 



ISOPODA ANOMALA. 



(or Apseudacea). 



Family Tan aid. e. 



See Proc. Zool. Soc. 1914, p. 348, and add for the pr^ssent 

 purpose : — 



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



1886. ,, 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 k M. Edwards, 1829. 



Tanais nierstraszi, sp. n. (PL 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 agi'ees with T. normmii Hichardson, 

 differing from it by having the ramus of the uropods 10-joiuted. 

 In this respect it stands between the large blind T. unUemoesii 

 Studer, which has 8 joints, and T. hirsiitics 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 different 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. Tlie 



