336 REV. T. K. R. STEIIDING ON CRUSTAPEA 



that the second to the fourth pairs of walking-legs are longer 

 and stronger than the fifth to tl e seventh pairs, though his 

 specific description shows that he means just the reverse, Hodg- 

 son in describing the mandible says of the palp, " fir^t and third 

 joints subequal, third the longest," his figure showing correctly 

 t\\e second joint as the longest. Cliilton and Hodgson, witii a 

 lingering retention of the name J/alio.cris, agree that the name 

 must be regarded as a sj^nonym of Munna. Hansen points out 

 tliat the character "eyes distinct" must be withdrawn from the 

 definition given by 8ars, if the genus is to include such species as 

 Munna cccca Richardson, M. truncata Richardson, and M. acanihi- 

 fera Hansen. But he does not notice Miss Richardson's proposal in 

 1908 (Pr. U.S. Nat. Mus. vol. xxxv. p. 79) to substitute the generic 

 name Ccecimimna foi' the species truncattts and IJaplomimna for 

 the species caicv,s. Should these pi^oposals be adopted, Hansen's 

 acmitldfer woxdd probably be allotted to Ccecimunna, thus with- 

 drawing all the blind species from Munna. In 1913 Miss 

 Richardson advocates the retention of Haliacris on the ground 

 of the special structure of the fii'st gnathopods in the male and 

 their great size. This distinction woxdd require the inclusion, 

 along with PfefTer's species, of Munna jxihuatus Lilljeborg, 1851, 

 and Munna neozelanicus Chilton, 1892. But it is at least highly 

 inconvenient to have the adult male in one genus, while the 

 females and young males can be appropriately placed in another. 

 In M. kroyeri Goodsir the carpal joint of the male's first gnatho- 

 pod is large, while in M. palmatus it is very much lar-gei-, but 

 surely this by itself should not count for generic difference. In 

 instituting his genus Pfeft'er was himself unacquainted with the 

 full development of the first gnathopod in the adult male. 



Munna antarcticus (Pfeffer). (PI. V.) 



1887. Haliacris antarctica Pfeffer, Krebse Siid-Georgien, Pt. 1, 



p. 97, pi. 6. figs. 28-47. 



1902. „ australis Hodgson, ' Soutliern Cross' Crust., 



p. 253, pi. 34. figs. 1 a-d, pi. 37. 



19C6. „ ,, H. Richardson, Exp. Antarct. fran- 



(j'aise. p. 16, fig. 20. 



1909. „ antarctica Chilton, Subant. Is. N.Zealand, Crust., 



p. 650, fig. 14 b. 



1910. „ „ Hodifson, Nat. Antarct. Exp., Isop., 



pp. 58-61. 

 1913. H. Richardson, Deuxieme Exp. Ant. 



fran^aise, p. 19. 



Mr. Hodgson says of the specimens obtained by the ' Dis- 

 covery ' that some of the old males " attain a length of seven 

 millimetres." None of the Falkland Islnnd .specimens exceeded 

 3 mm. Yet the single ex.ample of an adult male first gnathopod 

 is very charactei'istic of the advanced development. It differs 

 slightly from the only other available figure, given by Miss 



