External orbital angles 
Epibranchial teeth 
Traces of second epi- 
branchial teeth. 
Front. 
Postfrontal lobes 
Chelipeds 
Walking legs 
S. birdi 
Lateral margins slightly 
diverging distally.» 
Not projecting forward, 
separated from external 
orbital angles by a mi- 
nute incision, without 
oblique crest; lateral 
margins converging dis- 
tally and shorter than 
those of external orbital 
angles. 
Absent. 
Less wide, measuring 
half the distance be- 
tween external orbital 
angles; with deep and 
wide median emargina- 
tion. 
Median lobes more than 
twice as broad as the 
lateral ones. 
Meropodite without sub- 
distal tooth at superior 
border; upper border of 
mobile finger with a 
longitudinal row of 5 
spiniform teeth. 
Meropodite and propo- 
dite of penultimate pair 
of legs more than twice 
as long as broad; in the 
first to third pair the 
distal third of the pos- 
terior border of the me- 
ropodite is minutely den- 
ticulate. 


S. punctatum 
Lateral margins strongly 
diverging distally. 
Projecting forward, se- 
parated from external 
orbital angles by a deep 
and wide incision, with 
oblique crest; lateral 
margins diverging dis- 
tally and longer than 
those of external orbital 
angles. 
Present. 
Wider, measuring about 
2 of the distance be- 
tween external orbital 
angles; regularly convex 
at the free margin. 
Median lobes about 14 
times as broad as the 
lateral ones. 
Meropodite with  rect- 
angular subdistal tooth 
at superior border; up- 
per border of mobile 
finger with two thick, 
cone-shaped teeth. 
Meropodite and _ propo- 
dite of penultimate pair 
of legs exactly twice as 
long as broad; in all the 
legs the distal third of the 
posterior border of the 
meropodite is smooth. 
