32 
R. NORRIS WOLFENDEN. 
Anterior antennse 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 
O 
8 mm. 
5. Gaetanus minor. 
Gaetanus minor, Farran, Ann. Rep. 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 antennse 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 robustus. 
Gaetanus robustus , Sars, Ball. Mus. Oceanographiqne 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 antennse scarcely as 
long as the body. Size 8 mm. (? possibly the same as G. antarcticus, but the 
description of G. robustus is insufficient.) 
7. Gaetanus inermis. 
Gaetanus inermis, Sars, op. cit., p. 12. 
Body very thick, anterior division swollen. No trace of cephalic spine, last 
segiuent*of thorax rounded and without spines. Abdomen very short, not a quarter of 
whole length. Anterior antennse 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 antennse scarcely longer than the body. Size 4 - 35 mm. 
9. Gaetanus krueppi. 
Gaetanus kruppi, Giesbrecht, Mitt. Zool. St. zu Neapei, XVI. (1903), p. 202. 
Like G. armiger, but larger, viz., 3'6-4 mm. long, thorax shorter. Anterior 
antennse reach three joints beyond furca, twenty-second segment longer than in G. 
armiger. Feet like G. miles. $ S'7 mm. long, thoracic spines shorter than ? and 
antennse 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. 
