282 THE SCHIZOPODA. 
joint oblong-triangular, a little longer than the fifth and finely serrate along the 
inner margin. The lower flagellum is not fully half as long again as the upper, 
9-jointed, the basal joint long and extremely thickened towards the base, with a 
large tuft of innumerable, thin sensory setae; the second joint is extremely 
short, the third long and slender, the fourth much shorter, compressed, and 
distinctly widened towards the end, while the five distal joints increase in length 
to the last, all being besides strongly compressed, with the upper margin finely 
serrate. 
The antennal squama is long, rather narrow, tapers towards the end, with 
an outer tooth reaching beyond the short, oblique or transverse terminal margin; 
it reaches in the male to or a little beyond the end of third joint of the antennular 
peduncle (fig. 5a), in the female beyond the middle of that joint but never to its 
end; the two distal joints of the special peduncle of the endopod (a*) are very 
thin and taken together extremely long, reaching far behind the end of the 
squama. 
The maxillulae (fig. 5d) differ only in minor details from those of S. longi- 
corne (fig. 4a) and the same is the case with the maxillae (fig. 5e), the latter 
being, however, proximally somewhat broader in proportion to the length and* 
have the fourth joint marked off at the inner margin from the lobe of third 
joint. 
Fig. 5f, representing the inner and the median lobe of the copulatory organ, 
illustrates especially the great difference in thickness between the terminal and 
the proximal process (p*. and p*.) which, as pointed out in the “‘Siboga” paper, 
is the best specific character in this organ for S. abbreviatum in contradistinetion 
to S. maximum. (The copulatory organ of the latter species has been figured 
in the paper named). | 
Length of a good-sized male 15 mm., of a female 16 mm. 
Distribution — Most of the localities enumerated in the literature are not 
trustworthy, because the next species has frequently been confounded with S. 
abbreviatum. Sars’s type is from the tropical Atlantic, and the Copenhagen 
Museum possesses two specimens from the same area, viz. Lat. 23° 31’ N., 
long. 22° 41’ W., and Lat. 18° S., long. 2° W.; a number of specimens are at 
hand from the area in the northern temperate Atlantic explored by the Prince 
of Monaco. Furthermore it has been captured at some Stations in the Indian 
Archipelago by the ‘‘Siboga.” It is widely distributed in the Pacific; according 
to the list of Stations, Expedition of 1904-1905, it is rather common in the 
southern part in the area explored, going northwards to about Lat. 64° S8.; but 
