OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 289 



they come close together, covering the median setse. Among our specimens one had 

 the second perseopods of unequal size, in one both first and second perseopods were 

 represented only by blunt-ended, few-jointed stalks, in some cases only one of the 

 second pair was present. It is likely that these powerful grasping limbs are much 

 subject to injury. The length of an ovigerous female was 40 mm. between apices of 

 rostrum and telson. 



Localities— Gulf weed, June 29, 1904, lat. 29° 54' N., long. 34° 10' W. ; June 30, 

 1904, lat. 32° ll' N., long. 34° 10' W. ; and July 1, 1904, lat. 33° 53' N., long. 32° 

 27' W. ; Stations 537, 538, 539. 



Family Hippolytid^. 



1888. Hippolytidx, Bate, Rep. Voy. " Challenger," vol. xxiv. pp. 503, 576. 



1893. „ Stebbing, Hist. Crust., Internat. Sci. Ser., vol. lxxiv. p. 233. 



1901. „ Rathbun, U.S. Fish Comm. for 1900, vol. ii. p. 113. 



1906. ,, Caiman, Ann. Nat. Hist., ser. 7, vol. xvii. p. 30. 



1907. ,, Borradaile, Ann. Nat. Hist., ser. 7, vol. xix. p. 472. 

 1907. „ Caiman, Nat. Antarct. Exp., vol. ii., "Crust.," p. 1. 

 1910. „ Kemp, Fisheries, Ireland, 1908, p. 99. 



1912. ,, G. O. Sars, Arch. Naturv., vol. xxxii., Nos. 5, 7, 9. 



Genus Hippolyte, Leach. 



1814. Hippolyte, Leach, Edinb. Encycl, vol. vii. p. 431. 

 1860. Virbius, Stimpson, Pr. Ac. Sci. Philad., p. 35 (prodromus, p. 104). 

 1878. Caradina, Bate, J. Roy. Institution Cornwall, vol. v. p. 486. 

 1888. Hippolyte, Bate, Rep. Voy. " Challenger," vol. xxiv. pp. 576, 587. 



In his Challenger Report Bate recognises that as Hipijolyte was originally 

 founded for the single species H. varians, Stimpson, by including that species in 

 Virbius, condemned his own genus as a synonym to that named by Leach, and for 

 the same reason among others Bate saw that his isolation of a species as Caradina 

 varians (Leach) must be withdrawn. At the same time he notices that Milne- 

 Edwards' genus is Caridina, not Caradina, but prints Verbius in place of Virbius. 



In this genus the mandible has a cutting edge and molar but no palp. The first 



peraeopods have a short stout .chela, the second have a more slender chela and a 



triarticulate wrist. 



Hippolyte acuminatus Dana. 



1852. Hippolyte acuminatus, Dana, U.S. Expl. Exp., vol. xiii. p. 562 ; (1855) pi. xxxvi. fig. 1, a-e. 



1860. Virbius acuminatus, Stimpson, Pr. Ac. Sci. Philad., vol. xii. p. 36 (105). 



1888. Hippolyte bidentatus, Bate, Rep. Voy. "Challenger," vol. xxiv. p. 591, pi. cv. figs. 1, 2. 



1893. Virbius acuminatus, Ortmann, Ergebn. Plankton- Exp., ii. G. b., p. 46. 



This species has been efficiently described and figured by Spence Bate, who 

 named it bidentatus, evidently in allusion to the pair of teeth extending subdorsally 

 from the hind margin of the fifth pleon segment. Dana takes no notice of this 

 character. But these little pellucid processes are not very easy to observe, and the 

 probability is that Dana overlooked them. Though a single tooth on the under side 

 of the rostrum appears to be usual, one of the Scotia specimens has three teeth 



