SI 



Second feet, Jti .lutinrtly two-joiutHl. 



Third ami fourth feet, Hi and Re of three joint* each. D 2 of the fourth feet with 

 tuluil bristles as in Gaidin-. 



The extraordinary rise of this animal makes it the largest known specie* of 

 Gaetanut. It occurred once only in the ' Discovery ' collection, and also appeared in 

 the ' Gauss ' collection, and is probably Antarctic in its habitat Several new special of 

 Gaetanus have been described recently, and it may serve some useful purpose to 

 recapitulate here the different species discovered since Giesbrecht and Schmeil's last 

 work (Tierreich, 1898). 



1. GABTANUS MAJOR. 



0. maftr, Wolfenden, Proc. Zool. 8oc., London, Feb. 8, 1903, in Dr. Fowler's paper. 

 Farran, Ann. Rep. Fifth. Ireland, 1902-OS, Part II., App. II., 1905. 



Size 5 mm. and over. Anterior antennae larger than the body by al>out one joint ; 

 lamellar appendage of posterior foot jaws absent ; Re of first feet of three segments, 

 and with three Se. Cephalic spine short, and as in G. armiger. 



2. GABTANUS CAUDANI. 



Oattanut catidiwi, Canu, Ann. Univ. Lyon, V. 26, 1896. 



.. Wolfunden, Jour. .Mar. Biol. Assoc., 19u4, p. 24. 



.. (?) pdeatu*, Farran, ibid. 



Like G, mils*, but anterior antennae only one-and-half times as long as the body ; 

 lamella of posterior foot jaw like that of G. miles. Re of first feet, three segmented 

 basals of fourth feet with tulwl bristles, 5 mm. and over. Cunu's original description 

 was of one immature <? . Farran's were also immature specimens. 



3. GAKTANUS HOLTI. 



Oattantu holti, Farran, ibid. 



lattfrmu, Sara, Boll. Mns. Monaco, No. 26, March, 1905. 



longispinu*, Wolfenden, Plankton Studies, Part I. (1905), p. 7. 



Cephalic spine strong and directed l>ackwards with long interval between the 

 frontal part and base of the horn. Anterior antennae not as long as the body-spinet of 

 the last thoracic segment, strong, long, and directed backwards. Small lamella on 

 posterior foot jaw. First feet with three segments and 'three Se. Fourth feet with 

 basal tubal bristles. Size 4*74 mm. 



4. GAETAMDS ANTARCTICUS. 

 Gaetanii* antarctieut, Wolfenden, Plankton Studies, Part I. (1905), p. 7. 



Thorax gibbous, very stout short curved cephalic spine directed forwards, head 

 square, not like G. armiger. Abdomen short and thick, not a quarter of whole length. 



