276 THE SCHIZOPODA. 
short as compared with that of the distal lobe which is somewhat convex; the ’ 
fourth joint is well defined but very small and nearly more than twice as broad 
as long; the exopod is badly defined and distally without any produced, free part. 
The largest specimen, a female, measures 12 mm. in length, but adult speci- 
mens of both sexes are generally only 8-10 mm. long. 
Remarks.— More than half-grown to full-grown specimens of this small 
species are easily distinguished from very young specimens of S. abbreviatum 
of similar size by the antennal squama, which in S. carinatum is moderately 
broad to the end and never reaches the middle of third joint of the antennular 
peduncle, while in S. abbreviatum the squama tapers conspicuously towards the 
end and reaches to near the distal end of third antennular joint. This difference 
is useful when the elongate second pair of legs, which differs extremely in the 
two species, has been lost. 
It may be mentioned that a specimen from Sta. 4719 has an Epicarid fixed 
between the eyes, and that a male from Sta. 4724 has an Epicarid on the carapace 
a little from its front margin. 
Distribution.— The long list of Stations in the East Pacific shows that S. 
carinatum is common in the major part of the area explored, but is wanting in a 
broad longitudinal belt along the coast of America from the line southwards. 
It is widely distributed in the Pacifie according to the facts given above as to 
its capture in 1899 and 1900 by the ‘‘ Albatross,”’ in 1897 at the Fiji Islands by 
Dr. Agassiz, and Ortmann has recorded it from Lat. 28° 31’ N., long. 141° 47’ W., 
the Hawaiian Islands. Sars has recorded it from off Kandavu, Fiji Islands, and 
from off Mindanao, Philippine Islands. The “‘Siboga’’ captured it at a large 
number of Stations in the Indian Archipelago. It is also widely distributed 
in the Atlantic; Sars recorded it from ‘‘South Atlantic,’’ Ortmann from the 
Sargasso Sea, the Southern equatorial current and the Brazil current; finally 
the Copenhagen Museum possesses it from Lat. 7° N., long. 30° W., from Lat. 
17° 46’ N., long. 51° 12’ W., and from Lat. 20° 24’ N., long. 83° W. (West 
Indies). It has not infrequently been taken at the surface, and more than once 
in large numbers. 
b. Species with the elongate pair of legs terminating in false chelae having no real 
immovable finger but a very long and strong terminal, distally curved spine 
(and near this two shorter spines) on the penultimate joint. 
