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 curved; 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 S. microphthalma H. J. H. were not sepa- 
rated from S. 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 S. abbreviatum. 
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. Stylocheiron carinatum G. O. Sars, Forh. Vid. Selsk. Christiania for 1883, no. 7, p. 31. 
1885. Stylocheiron carinatum G. O. Sars, Challenger Rept., 18, p. 137; pl. 26. 
1910. Stylocheiron carinatum H. J. HANSEN, Siboga-Exp., 37, p. 113, pl. 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. 300fms. to surface. 27 specimens. 
Sta. 4635. Nov. 4, 1904. Lat. 3° 52.5’ N., long. 84° 14.3’ W. Surface. 274 specimens. 
Sta. 4640. Noy. 6, 1904. Lat. 0° 39.4’S., long. 88° 11’ W. Surface. 6 specimens. 
