ZOOLOGY OF FERNANDO KOROMA. 
525 
surface almost smooth, with a few small tubercles near the upper 
and under margins. Upper margin compressed into a serrated 
keel; under margin also serrated. Anterior margin of hand 
nearly at right angles to the axis of the pollex. Pollex upturned 
at the apex, furnished on its occludent margin with a tooth 
which closes behind the tooth of the dactylopodite. Upper 
margin of dactylopodite serrated. 
Fourth and fifth pairs of limbs resembling each other in being- 
slender and elongated, in having the propodite furnished below 
with a series of fine spines and consisting of three segments, and 
in having the dactylopodite bifid. But whereas the propodite of 
the fourth pair consists of five segments, the propodite of the fifth 
pair consists of but three. The number of divisions of these 
segments, however, appears to vary upon the two sides. 
Abdominal tergites smooth above ; lateral portions uarrowed, 
somewhat pointed, and with margins more or less spined. 
The outer and inner lamellae of appendages of the sixth 
abdominal somite with a median longitudinal crest, serrate 
exterior margin, and fringed inner margin. Outer margin of 
inner lamella furnished below with a stronger tooth. 
Telson with converging lateral margins, rounded posterior 
margin ; each lateral margin furnished with a central tooth ; 
posterior margin furnished with three teeth, one on each side 
and one in the middle. Upper surface of telson marked with two 
longitudinal crests, each of which bears three spines arranged 
longitudinally; the depression between the crests furnished proxi- 
mally with four spines in two longitudinal series. Base of 
telson bearing on each side one marginal spine. 
Two specimens. 
Length from apex of rostrum to posterior margin of telson 
13 millim. ; total length of upper surface of carapace (including 
rostrum) 5| millim. ; length of manus and pollex of third pair of 
feet 8 millim. 
This species seems to differ from St. crassimanus, Richters, 
in the possession of a greater number of teeth upon the rostrum 
and in the absence of a crest upon the abdominal tergites. 
The three species which hitherto have, so far as I am aware, 
composed the genus w r ere taken at Touquets (Mauritius). 
