CRUSTACEA FROM THE FALKLAND ISLANDS, 375 
here be called to Mr. C. D. Walcott’s remarkable account of 
Middle Cambrian Crustacea (Smithson. Misc. Coll. vol. lvii. no. 6, 
1912), in which he rather confusingly refers to the present group 
as Phyllocarida, Nebaliacea, and Leptostraca, without clearly 
indicating that he uses them as synonyms. 
Gen. NEBALIA Leach. 
1814. Nebalia Leach, Zool. Miscellany, vol. i. p. 99. 
1888. » Claus, Arbeit. Zool. Inst. Wien, vol. viii. pt. 1, 
p. 122: ° 
1909. » Chilton, Subantarctic 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 B1PES (O. Fabricius). 
1780. Cancer bipes O. Fabricius, Fauna Groeulandica, no. 223. 
1888. Nebalia bipes, var. chilensis Claus, Arbeit. Zool. Inst. Wien, 
vol. viii. pt. 1, pp. 127, 132. 
1904. V. 6. chilensis Thiele, Ergeb. der deutschen Tiefsee-Exp. 
vo]. vill. p. 13, pl. 4. f. 73. 
1905. NW. bipes Thiele, Deutsch. Siidpol. Exp. vol. ix., Zool. i. 
p- 67. 
A dissected specimen, apparently a young male, shows a rostrum 
with the proportions of length to breadth, 16:6, or slightly less 
than 6. The eyes have a little lateral projection. The first 
antenne agree with those which Dr. Thiele describes and figures 
for his Nebalia longicornis magellanica. He allows that, on the ~ 
whole, the southern JV. longicornis Thomson differs little from 
the northern 1, bipes. Itseems to me very doubtful whether the 
specific distinction can be maintained. In one of Mr. Vallentin’s 
specimens the second antenne nearly reach the end of the caudal 
ram. 
Locality. Whales Bay, May 17, 1910. 
THYROSTRACA. 
1893. Thyrostraca Stebbing, History of Crustacea, Internat. Sci. 
Ser vole bexave pp yO, bl ail. 
1902. 5 Stebbing, Encycl. Brit. ed. 10, suppl. vol. xxxiii. 
(®)) joe BU 
Fam. LEPADIDA. 
1851. Lepadide Darwin, Monogr. Cirrip., Ray Soc., vol. i. 1851. 
Gen. Leras Linn. 
1758. Lepas Linn., Syst. Nat. ed. 10, p. 667. 
