274 THE SCHIZOPODA. 



the lower flagellum is long, in the male oblong-triangular, being much thickened 

 towards the base. The peduncle of the endopod of the antennae reaches con- 

 siderably beyond the end of the squama — a feature not found in any other 

 genus — and its penultimate joint is very elongate, much longer than the termi- 

 nal. The maxillae have the fourth joint either very small or badly defined, 

 and the inner margin of both lobes is without the usual incision. 



In the females the endopod of fifth pair of thoracic legs is moderately long, 

 three-jointed, the endopod of sixth pair much larger than the small exopod and 

 two-jointed; in the males the endopod of sixth pair is always wanting, while in 

 fifth pair it seems to be wanting (f. inst. in S. longicorne) or developed as in the 

 female (in S. maximum). 



The copulatory organs of first pleopods have the median lobe coalesced 

 with the inner lobe to near the end of the latter, while the former is oblong, simple, 

 and distally rounded; the processes are .small in proportion to the size of the 

 whole organ; the spine-shaped process is curved and shaped as in several other 

 genera, while the two other processes are at most a little cur\'ed; the lateral 

 process is placed rather near or very near the base of the inner margin of the 

 lobe, and an additional process is always wanting. The auxiliary lobe is placed 

 on the inner side of the setiferous lobe and sometimes very reduced. 



The genus comprises nine species, eight of which are represented in the 

 "Albatross" collection; the only species not present is S. insulare H. J. H., 

 hitherto known only from the Indian Archipelago. As to the geographical • 

 distribution numerous statements in the literature are discarded as untrust- 

 worthy, because >S. affine H. J. H. and 6'. jnicrophthahna H. J. H. were not .sepa- 

 rated from tS'. suhmii and this last-named species sometimes was not distinguished 

 from S. longicorne. In a similar way S. maximum H. J. H. (1908) was not dis- 

 tinguished from .5. ahhrevialuyn . 



a. Species only with lateral setae on the penultimate joint of the elongate pair of legs. 



33. Stylocheiron carinatum G. O. Sars. 



Plate 11, figs. 2a-2b. 



1883. Slylocheiron carinatum G. O. Sar.s, Forh. Vid. Sel.sk. Cliristiania for 1883, no. 7, p. 31. 



1885. Stylocheiron carinatum G. O. Sars, Challenger Rept., 13, p. 137; pi. 26. 



1910. Stylocheiron carinatum H. J. Hansen, Siboga-Exp., 37, p. 113, pi. 16, figs, la-lh. 



Sta. 4611. Oct. 18,1904. Lat. 10° 33' N., long. 88° 30' W. Surface. 69 specimens. 



Sta. 4613. Oct. 19, 1904. Lat. 9° 45' N., long. 86° 20' W. 300 fms. to surface. 1 specimen. 



Sta. 4634. Nov. 4, 1904. Lat. 4° 35.4' N., long. 83° 32.3' W. 300 fms. to surface. 27 specimens. 



Sta. 4635. Nov. 4, 1904. Lat. 3° 52.5' N., long. 84° 14.3' W. Surface. 274 specimens. 



Sta. 4640. Nov. 6,1904. Lat. 0° 39.4' S., long. 88° 11' W. Surface. 6 specimens. 



