19 
20 
21 
22 
’s RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 243 
sized species, distance between external orbital angles 18—22 mm.; 
in Chinese and Japanese seas. 19 
Sides of carapace always more or less divergent 
posteriorly; width of front generally equal to half the distance 
between external orbital angles. Small species, distance between ex- 
ternal orbital angles generally less than 14 mm. 20 
A trace of a second epibranchial tooth present. Outer surface of 
palm of cheliped granulate, with an obliquely-longitudinal line in 
the middle, and beneath this line a defined group of larger granules. 
Meropodites of walking legs only 2'/, times as long as broad. 
Ses. intermedia de Haan. 
No trace of a second epibranchial tooth. Outer surface of palm of 
cheliped finely granulate. Meropodites of walking legs more slender, 
three times as long as broad. Ses. sinensis H. Milne-Edwards. 
Protogastric region of the carapace smooth and shining, not tuber- 
culate, only finely punctate; median postfrontal lobes twice as broad 
as the external. Outer surface of palm of cheliped perfecly smooth, 
inner surface without transverse crest; upper border of movable finger 
wholly covered with irregularly-arranged, minute granules. 
Ses. thelxinoë de Man. 
Protogastric region of the carapace, like the rest, granulate, tuber- 
culate, or hairy; median postfrontal lobes only 1'/, times as broad 
as the external. Outer surface of palm of cheliped generally gra- 
nulate. 21 
Width of front (between eye-stalks) distinctly more than half the 
distance between external orbital angles. 22 
Width of front (between eye-stalks) about exactly equal to or less 
than distance between external orbital angles. 24 
Surface of carapace roughly pitted, with tufts of hair in most of 
the pits; behind each postfrontal lobe a tubercle, with a bunch of hair, 
the external of nearly the same size as the lobes and farther forward 
than the median ones. Inner surface of palm of cheliped smooth. 
Meropodites of walking legs 2'/, times as long as broad. 
Ses. mindanaoensis Rathbun. 
Surface of carapace granulate, with some very small tufts of hair, 
but no larger, tufted tubercle behind each postfrontal lobe. Inner 
surface of palm of cheliped with transverse, sometimes even prominent, 
