CRUSTACEA FROM THE FALKLAND ISLANDS. 375 



liere be called to Mr. C. D. Walcott's remarkable account of 

 Middle Cambrian Crustacea (Smithson. Misc. Coll. vol. Ivii. no. 6, 

 1912), in which he rather confusingly lefers to the present group 

 as Phyllocarida, Nebaliacea, and Leptostraca, without clearly 

 indicating that he uses them as synonyms. 



Gen. Nebalia Leach. 



1814. Xehalia Leach, Zool. Miscellany, vol. i. p. 99. 



1888. „ Claus, Arbeit. Zool, Inst. Wien, vol. viii. pt. 1, 



p. 122. 

 1909. ,, Chilton, 8ul)antarctic Is. of N. Zealand, p. 669. 



Other references coincide with those given above. It may 

 be noticed that Leach assigned his genus to the subclass 

 Malacostraca. 



Nebalia bipes (0. Fabricius). 



1780. Cancer bipes 0. Fabricius, Fauna Groenlandica, no. 22.3. 

 1888. Xehalia bipes, var. chilensis Claus, Arbeit. Zool. Inst. Wien, 

 vol. viii. pt. 1, pp. 127, 132. 



1904. X. b. chilensis Thiele, Ergeb. der deutscheu Tiefsee-Exp. 



vol. viii. p. 13, pi. 4. f. 73. 



1905. X. bipes Thiele, Deutsch. Siidpol. Exp. vol. ix., Zool. i. 



p. 67. 



A dissected specimen, apparently a young male, shows a i-ostrum 

 w-ith the proportions of length to breadth, 16:6, or slightly less 

 than 6. The eyes have a little lateral projection. The first 

 antennae agree with those which Dr. Thiele describes and figures 

 for his Xebalia longicornis magellanica. He allows that, on the 

 whole, the southern iV^. longicornis Thomson differs little from 

 the northern X. bipes. It seems to me very doubtful Avhether the 

 specific distinction can be maintained. In one of Mr. Vallentin's 

 specimens the second antennae nearly reach the end of the caudal 

 rami. 



Locality. Whales Bay, May 17, 1910. 



THYROSTRACA. 



1893. Thyrostraca Stebbing, History of Crustacea, Internat. Sci. 



Ser. vol. Ixxiv. pp. 6, 11, 31. 

 1902. „ Stebbing, Encycl. Brit. ed. 10, suppl, vol. xxxiii. 



(9) p. 319. 



Fam. L E p A D I D .E. 

 1851. Lepadiclre Darwin, Monogr. Cirrip., Ray Soc, vol. i. 1851. 



Gen. Lepas Linn. 

 1758. Lrpas Linn , Syst. Xat. ed. 10, p. 667. 



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