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Show 962 DR. II. J. HANSEN ON CRUSTACEANS [Dec. 1, S. vlqilax, Stimps., H. J. H- Only the Mastigopus has been described (see later on). The adults of this and the next species, S. penerlnkl, Bate, H . J. H., are very closely related to each other and easily separated from S. Incertus, n. sp., and S. hcdla, Fax., by the character, that on the ext. br. of urp. the ciliated part occupies between f and | of the exterior margin. The best character between 8. vigilax and 8. penerlnkl is that in 8. vlgilax the interior margin of the sixth joint of mxp.3 is armed with 22-25 spines, of which 4 are implanted on the third subjoint, which is but a little or scarcely shorter than .the fourth ; in S. penerlnkl the sixth joint is armed with c. 15 spines (the apical one as usual not included), of which but two on the third subjoint, which is considerably shorter than the fourth. In S. vlgilax the rostrum is of medium length, strongly laterally compressed, seen from the side rather broad and apically more or less distinctly truncated, with an acute prolongation from the superior edge.-Length 16-27 m m. This species is as common as S. edwardsl, Kr.; I have seen numerous specimens of adults and larvae from the Atlantic northward to lat. 42° N.; in the Indian Ocean the larvae are common and distributed eastward to lat. 24° 50' S., long. 103° E. S. penerlnkl, Bate, H . J. H.-Only the Mastigopus has been described (see below).. The rostrum of the adult is somewhat elongated, seen from the side a little more narrow than in S. vlgilax and from the middle tapering towards the acute apex. The chief character in the structure of mxp.3 is given under S. vlgilax.-Length c. 18-5 m m. I have seen but two adult specimens, the one captured at lat. 17° N., long. 22° W., and this is one of the specimens alluded to by Kroyer as a variety of S. edwardsl. S. Incertus, n. sp.-Only one adult specimen, a female, has been seen, but this is a giant in comparison with the other related species, being 47 m m . long. On the ext. br. of urp. the ciliated part occupies between ^ and | of the exterior margin. The first joint of the antenn. ped. is scarcely shorter than the third. The rostrum is somewhat elongated, strongly compressed; seen from the side the proximal half is rather broad and then it tapers towards the acute apex. The interior margin of the sixth joint of mxp.3 with but 13 spines, two of them on the third and one on the fourth subjoint, which is but very little longer than the third. The other characters are mentioned above. The adult specimen was captured (on the surface) in lat. 34° 50' S., long. 4° 30' W . ; a sub-adult specimen near that locality, and a larva in lat. 40° 4' S., long. 53° 20' E. S. halia, Fax.-The specimens on which this species was established in 1893 are just the large specimens described and figured by Faxou in 1895 as a variety of S. edwardsl, Kr. (p. 212, pl. Ii. figs. 1-1 e). This species, of which I have seen no specimen, is closely related to S. Incertus, m., but disagrees in one character, about which Faxon writes, p. 213: "The first and second segments of the antennule are of about equal length, while the |
