49 
length of the cephalothorax, from the apex of the frontal spine to the base of the genital 
segment. The first, third, and fourth segments of the abdomen are of about equal length. The 
second segment is dicidedly longer than the others. The fifth segment is very short. The 
rostrum is distinctly bifid at the apex. The mouth organs are considerably modified, and the 
mandible is without a toothed biting part. The first basal joint of the second maxilliped does 
not appear to have any trace of a lamella. The exopodite of the first pair of feet is distinctly 
three-jointed, and the last joint is furnished with a small spine on the middle of its outer 
margin. The first joint of the basiopodite of the fourth pair of feet has no bristles on its inner 
margin. The fifth pair of feet is moderately large and prehensile and has rudimentary endopodites. 
The right exopodite is two-jointed. The apical portion of the second joint is spiniform and very 
faintly articulated. The left exopodite is apparently composed of three joints. The apical half 
of the last joint is spiniform and slightly articulated. The endopodite of the right foot is of 
moderate size and faintly two-jointed. The apical half is large and triangular in shape. The 
endopodite of the left foot is short and rod shaped. 
Two specimens were obtained, but one was immature. Length of mature male 5,6 mm. 
I regard WoLFENDEN’S Gaetanus mayor, to be identical with GirsBRECHT’s Gaelanus kruppic. 
WOLFENDEN’s description appeared in a report, ‘Plankton of the Faroe Channel’, by G. H. Fowter, 
and was read at a meeting of the Zoological Society, London, on February 3rd, 1903. Volume I, 
part 1, of the proceedings of the Zoological Society, containing papers read in January and 
February, is dated June 1903. Gaetanus kruppi is described by GIESBRECHT in a report by 
S. Lo Branco, published in Mittheilungen aus der Zoologischen Station zu Neapel, 16 Band, 
1 & 2 Heft, which bears the date April 30, 1903. GiEsBRECHT’s description therefore, appears 
to be the first that was published. 
The species described by EsterLy in 1906, as Gaetanus brevicornis, appears to be the 
same as Gaetanus major, \WOLFENDEN, and is therefore identical with GrrssrecHT’s Gaefanus 
kruppi. Vhe only apparent difference is that Estrrty’s species possesses a lamella, and Gaefanus 
major is described as having no lamella on the first basal joint of the second maxilliped. I have 
examined a number of specimens of a Gaefanus from the deep water of the Farde Channel, 
which agree in all points with Wo.LrenpEN’s Gaefanus major, except that they have a lamella. 
I think it is extremely probable that the lamella in WoLFrEeNDEN’s preparation had been accidently 
folded under the joint, and so overlooked. 
Gaetanus clarus Esterly, is the same as the male described above, which I regard to 
be the male of Gaetanus kruppit. 
Gaetanus kruppic is evidently widely distributed, and is not uncommon in the deep 
water of the North Atlantic. 
6. Gaetanus latifrons G. O. Sars. Plate X, figs. 10—17. 
Gaetanus latifrons Sars, 1905(a), p. 11. 
Goons Pale Wein, WOR, Os 2a) jole WAL ies, ty ue 
Gaetanus longispinus \Wolfenden, 1905, p. 7, pl. III. 
Gaetanus latifrons Pearson, 1906, p. 14. 
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SIBOGA-EX?PEDITIE XXIXa, 7 
