32 R. NOREIS WOLFENDEN. 



Anterior antennae not as long as the body. Posterior foot jaw with lamella. Re of 

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

 8 mm. 



5. Gaetanus minor. 

 Gaetanus minor, Farran, Ann. Eep. Fish. Ireland, 1902-03, P. II., App. II. (1905), p. 34. 



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-jointed Re. Size 2*4 mm. 



6. Gaetanus robustds. 

 Oaetanus roiustus, Sars, Bull. Mus. Oceanographique Monaco, no. 26 (1905), p. 11. 



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 whole length. Anterior antennae scarcely as 



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

 description of G. robustus is insufficient.) 



7. G-AETANUS INERMIS. 

 Gaetanus inermis, Sars, op. cit., 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 curvicornis. 

 Gaetanus curvicornis, Sars, op. cit., p. 11. 



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

 segment moderately large and divergent. Very short abdomen only a quarter the 

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



9. Gaetanus krueppi. 

 Gaetanus Icruppi, Giesbreclit, Mitt. Zool. St. zu Neapel, XVI. (1903), p. 202. 



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

 antennae reach three joints beyond furca, twenty-second segment longer than in G. 

 armiger. Feet like G. miles. $ Z'7 mm. long, thoracic spines shorter than ? 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. 



