OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 263 



The ambulatory limbs are short, with setose fingers. The pleon is five-segmented. 

 The measurements of the specimen coincide with those given by de Sattssure, length 

 14 mm., breadth 22 mm., width of front 6 mm. 



Locality. — St. Vincent, Porto Grande, shore N.E. ; December 1, 1902 ; Station 24. 



Family Portunid^e. 



Genus Lupa, Leach. 



1813. Lupa, Leach, Edinb. Encycl., pol. vii. p. 390. 



1833. Neptunus, de Haan, Crust. Japonica, decas 1, p. 7. 



1897 Portunus, Rathbun, Pr, Biol. Soc. Washington, vol. xi. pp. 155, 160. 



1908. Lupa, Stebbing, Annals S. Afr. Mus., vol. vi. part i. p. 11. 



Several other references for the genus may be obtained from those given for the 

 following species. From the neighbouring and very similar genus Callinectes, 

 Stimpson, the present is distinguished in the male sex by having the pleon triangular, 

 without the narrow ending which in Callinectes gives it as it were the shape of the 

 capital letter T. 



Lupa sayi, Gibbes. 



1802. Portunus pelasgicus, Bosc, Hist. Nat. Crust., vol. i. p. 219, pi. v. fig. 3 (Portune pelasgique). 



1817. Lupa pelagica, Say, J. Ac. Sci. Philad., vol. i. p. 97. 



1830. Portunus pelasgicus, Bosc and Desmarest, Hist. Nat. Crust,, vol. i. p. 235, pi. v. fig. 3 (Portune 



pelagique). 

 1850. Lupa sayi, Gibbes, Pr. Amer. Assoc, p. 178. 



1852. ,, „ Dana, U.S. Expl. Exp., vol. xiii. part i. p. 273, pi. xvi. fig. 8. 

 1861. Neptunus sayi, A. Milne-Edwards, Arch. Mus. Hist. Nat., vol. x. p. 317, pi. xxix. fig. 2. 

 1878. „ „ A. Milne-Edwards, Crust. Mexic, p. 210. 



1886. Neptunus (Neptunus) sayi, Miers, Rep. Voy. " Challenger," vol. xvii. part xlix. p. 173. 



1897. Portunus sayi, Rathbun, Ann. Lnst. Jamaica, vol. i. p. 22. 



1898. „ „ Rathbun, Pr. U.S Mus., vol. xxi. p. 592 



1908. „ „ Verrill, TV. Connect. Ac. Sci., vol. xiii. pp. 373, 374, 376, text-fig. 25, pi. xviii. 



fig. 2, pi. xxi. fig. 1. 



It is probable that this species was included by Herbst in his Cancer pelagicus, 

 Krabben und Krebse, vol. i. p. 159, 1783, and represented by his fig. 55 on pi. viii. 

 Miers remarks that " the convex, marbled carapace, short lateral epibranchial spines, 

 and the absence of a spine on the posterior margin of the merus [fourth joint] of the 

 chelipedes are characteristic of this species." He observes that " a large series of 

 specimens of this common pelagic species was taken from the Gulf weed" by the 

 Challenge!^ Expedition. The larger of two female specimens obtained by the Scotia 

 measured 66 mm. from point to point of the epibranchial spines, with a length of 

 32 mm. for the carapace. A male specimen similarly measured 70 x 38 mm. The 

 pleon in this agreed with Dana's single figure, which represents this part of the 

 organism. The male organs are very slender except at the base, and their apices, 

 which curve strongly outwards, nearly reach the end of the telson. 



Locality.— From Gulf weed, 29° 54' N., 34° 10' W. to 33° 53' N., 32° 27' W. ; 

 $ June 30, 1904, ? June 29 and July 1, 1904 ; Stations 537, 538, and 539. 



