32 • R. NORRIS WOLFENDEN. 



Auterior autfuu;u nut as long as the lioily. i'ustcrior fuut jaw with laineUa. Re of 

 first f( 

 8 mm. 



first feet with three segments and three Se. Fourth feet with tubal bristles. Size 



5. Gaetanus minor. 

 Gaetamcs minor, Farran, Ann. Rep. Fish. Ireland, 1902-03, P. II., App. If. (lOo.'.), p. .'U. 



Cephalic spine as in G. armiger, long slender spines of last thoracic segment. 

 Anterior antennae reaching only to genital segment. First feet with Re of two 

 segments and only two Se. Second feet with one-jointeil Re. Size 2 '4 mm. 



G. Gaetanus kobu^tos. 

 Gaetamts robiistus, Sars, Bull. Mas. Oceanographique Monaco, no. 2G (lOO;")), p. ll. 



Robust, cephalothorax a little swollen in middle. Cephalic .spine small, curved, 

 or sometimes absent. Spines of last thoracic segment very strong and divergent. 

 Abdomen thick and about one-third of wliole length. Anterior antennae scarcely as 

 long as the body. Size 8 mm. (? possibly the same as G. antarcticus, but the 

 description of G. rohustus is insufficient.) 



- 7. Gaetanus inermis. 

 Gaetanus inermis, Sars, np. n't., p. 12. 



Body very thick, anterior division swollen. No trace of cephalic spine, last 

 segment of thorax rounded and without spines. Abdomen very short, not a quarter of 

 whole length. Anterior antennae not longer than body. Structure of other parts not 

 different from other species of this genus (?) Size 6 • 30 mm. 



(In the absence of cephalic and thoracic spines, which are constant in this genus, 

 this is probably not a Gaetanus.) 



8. Gaetanus ourvicornis. 

 Gaetanus cvrvicornis, Sars, oj). cit., p. 11. 



Body like G. miles (Giesbrecht), short curved cephalic spine. Spines of last thoracic 

 segment moderately large and divergent. Very short a])domen only a quarter the 

 whole length. Anterior antennae scarcely longer than the body. Size 4 • 35 mm. 



9. Gaetanus krueppi. 

 Gaetanus hruppi, Giesbrecht, Mitt. Zool. St. v.n Neapel, XVI. (1903), p. 202. 



Like G. armiger, but larger, viz., 3 "6-4 mm. long, thorax shorter. Anterior 

 antennae reai'li three joints beyond furca, twenty-second segment longer than in G. 

 armiger. Feet like G. miles. (J 3" 7 mm. long, thoracic spines shorter than 9 and 

 antennae shorter than body. Se of Re 2 of first foot rudimentary ; fourth feet without 

 tubal bristles. Fifth feet Ri of one segment. Re of right foot of two ; of left, of three 

 segments. Mediterranean. 



