The Sympoda. 135 



angle a feature not possessed by the typical genus Vaunthompsonia, 

 Bate, 1858. 



GEN. BATHYCUMA, Hansen. 



1895. Bathyciiwi, H. J. Hansen, Ergebn. Plankton-Exp., vol. ii., 



G.c., p. 55. 



1905. B., Caiman, Fisheries, Ireland, for 1904, I., p. 17. 

 1905. B., Caiman, Siboga-Exp., vol. xxxvi., p. 9. 

 1908. B., Zimmer, Deutsch. Tiefsee-Exp., vol. viii., p. 164-166. 

 1912. B., Caiman, Proc. U.S. Mus., vol. xli., p. 614. 



General form elongate. Pseudorostral lobes meeting in the front. 

 First pedigerous segment short, but well exposed. Telsonic segment 

 produced between the bases of the uropods. Eye wanting. Man- 

 dible with long spine-row and strong molar. First maxillte with 

 bisetose palp. First maxillipeds comparatively broad, the epipod 

 furnished with several branchial leaflets. Third maxillipeds w T ith 

 second joint distally produced, the fourth little expanded. First 

 four peraeopods in male, only the first three in female, carrying 

 exopods. All five pairs of pleopods in male well developed. 



To this genus Dr. Caiman in 1905 transferred Leucon brevirostris , 

 Norman, 1879, and also in 1905 described a new species, Bathycuma 

 loiir/irostris, to which he added Bailiijcuma longicaudatus in 1912, 

 calling it " Bathi/citina (?) lonrjicaudata" 



BATHYCUMA NATALENSIS, n. sp. 

 Plate XLIX. 



All the five species assigned to this genus show signs of very near 

 relationship. It is an inconvenient circumstance that in two cases 

 only the male is known, and in two others only the female. Only 

 in the case of B. brevirostris (Norman) is the situation saved by Dr. 

 Caiman's decision that Vaunthompsonia cceca, Bonnier, 1896, is a 

 synonym of Norman's species. From Norman's account of the 

 female the form about to be described differs in respect to the 

 third maxillipeds, the telsonic segment, and the uropods. From 

 Bonnier' s description and figures of the young male it differs further 

 in regard to the first and second maxillipeds. From B. lonyirostris, 

 Caiman, founded on a young male, it differs strikingly in characters 

 of the pseudorostral lobes, and from B. longicaudatus, Caiman, 

 founded on an immature female, it differs conspicuously by inferior 

 size and in the proportions of the first antennae. From the typical 

 species, B. elongating, Hansen, also described from an immature 



