20 ae Bulletin American Museum of Natural History [Vol. LIII 
MEASUREMENTS.—The two specimens are about of the same size 
over all, including the antenne; they are approximately 16 mm. in 
length, of which the carapace measured on the median line represents but 
4.5 mm. in one and 5 mm. in the other. 
I have not been able to compare the young stage represented by 
these specimens with the same stage of any other species, or even speci- 
mens of those species of anywhere near the same size. 
Of course, the sculpturing of the carapace and abdomen is scarcely 
evident, nor does the armature of the median carina seem to have been 
developed. The spines along the lateral margin of these very juvenile 
specimens are much more clear-cut, sharper, and finer than in the smallest 
S. arctus available for examination. 
Tribe THALASSINIDEA 
Callianasside 
Upogebiinz 
Upocesia Leach 
Upogebia Leacu, 1814, ‘Edinburgh Encyclopedia,’ VII, p. 400. 
Upogebia furcata (Aurivillius) 
Plate VIII 
Gebia furcata AURIVILLIUS, 1898, Bihang K. Sv. Vet.-Akad. Handl., Stockholm, 
ARTY ATC. £V5No0.- 12 9713; Plt, foe, & 7. 
Previously known only from the type locality, “river of Bibundi, Cameroon, in 
decaying fragments of wood.” 
Banana, July 1915, 7007, 809 ; August 1915, 8607, 1182 (1 Ovig.). 
San Antonio, August 1915, 1c” juvenile. 
Aurivillius’s figures lack a spine which occurs at the outer infero- 
distal angle of the carpus of the chelipeds. 
‘The habitat of the ‘scorpion lobster’ U pogebia furcata in Banana 
Creek (PI. VIII, fig. 1) is only near the shores some five miles up from the 
. mouth where the water is still strongly brackish. From a distance the 
places where Upogebia is common look like many others—low fringes of 
mud—but a closer view shows that they consist of a dark brown peaty 
-mass completely pitted with large and small holes and, though water- 
soaked, are extremely tough. Over them the tides wash so strongly that 
plants apparently have great difficulty securing a foothold. This peat- 
a ee gl Ae ee ees 
; 1T wo species of bopyrid isopods (Pleurocrypta langi and Pseudione chapini f iti 
in 2 echial chambers of specimens of this lot. Cf. Van Name, io ne ae ee ae tist 
9 PP. 07, Ov. 
