COPEPODA 103 



most a rather smaller Mediterranean variety of this species", it seems probable that Farran's spec- 

 imens belong to the species described above. The female of which A. Scott in the Siboga Expe- 

 dition has given figures and has identified with G. Krnppi\ is possibly identical with this species 

 (Size 57 mm.; lobe IV maxillipeds with 3 setae and frontal sj^ine rather short), but the male is scarcely 

 so on account of the different shape of Re dextr. pes V. Scott regards Esterly's G. brcvicornis (1906 

 p. 56—57) as identical with G. Kruppi^ though the lamella of the maxillipeds has quite another shape, and 

 his G. clams (pp. 57—58) as the male of this species ; in the latter supposition he is possibly right, 

 but it is in any case different from the male from the Atlantic. 



If G. Kntppi and major of the different authors are identical, its distribution is wide (Indian 

 Ocean, South and North Atlantic and the Mediterranean); if only the localities which certainly belong 

 to the species described here are taken into consideration its range encompasses the North East 

 Atlantic as far south as 50° L,. N. and as far north as 65° L. N.; it is distributed as far west as 

 Denmark Strait (L. W. 28°), and as far east as the Fseroe-Iceland channel (I^. W. 4°). All records show 

 that it is a deep sea species. 



26. Gaetanus minor Farran. 

 (PI. Ill fig. 4a). 



1905. Gaetanus minor n. sp. Farran, p. 34, pi. V figs 1 — ii. 



igo6. — — Farran. Pearson, p. 14. 



1908. — — — Farran, p. 37. 



1908. — — — V. Bremen, p. 41, fig. 46. 



190S. — — — Wolfenden, p. 32. 



1909 Gaetanus minor Farran. A. Scott, pp. 47— 48, pi. IX 



figs 1—8. 

 igii. — — — (minimus? n. sp.) Wolfenden, 



pp. 233- 234, text-figs 20 a— e. 



Description. f$. Size: 2-3 mm., anterior division 1-89; urosome 0-44 mm. Farran's specimens 



measured 2'4 mm. 



The short rostrum is undivided. The anterior division is 4-3 as long as the urosome. The 

 lateral spines reach the end of the genital somite (fig. 4 a). The genital somite is rather swollen below, 

 with a distinct receptaculum seminis. The caudal rami are almost as long as wide. The relative 

 length of the abdominal somites and the furca is 20, 9, 8, 8 and 7. 



The antennulae reach just beyond the end of the genital somite; the measurements are prac- 

 tically as given by Farran, and the appendages are as in preceding species. The Re of the antennae 

 is scarcely 1-4 as long as Ri; the Ri I is twice as long as Re II, which is again 2-6 as long as Re I, 

 and 1-6 shorter than Re III. The Re II has the short Se 2 placed on a conical protuberance, but has 

 none for the more slender Se 3. The maxillulae differ from those of G. Kruppi by the 2 spinelike 

 Sp. of the Li 2. The third basipodite of the maxillipeds is ri as long as the 2 first, and 27 as long 

 as the Ri; the second basipodite has, as stated by Wolfenden, a rounded lamellous process, and the 

 lobe IV has as usual 3 setae + a sensory lobe; the third basipodite has in a similar way as in G. miles 

 Giesbr. (cf. Taf. 14 fig. 24) the inner margin produced into a rounded process which slopes most 

 gradually towards the base, and here bears the usual row of teeth. This process is distinct but nnich 

 lower in G. Kruppi, and is only indicated in Gaidiiis. 



The terminal seta in the exopodite of pes II, which has 14 well separated teeth, is ri as 

 long as the Re I— II. The second basipodite in the fourth pair of legs has 12 stiff pointed bristles 



