ZOOLOGY OP FERNANDO NORONHA. 
519 
border, without accessory teeth ; its greatest length equal to one 
half of the length of the superior margin of the manus. Anterior 
margin of the “thumb ” on the inner side nearly vertical, forming 
an obtuse angle with the inclined superior margin. Superior 
and inferior margins of thumbs on the outer side nearly parallel ; 
in front united by a distinct anterior border, which below 
curving forwards forms with the inferior border the tooth of the 
thumb, which does not project so far forwards as the anterior 
margin of the dactylus. 
Upper margin of the manus with a very faint constriction in 
its auterior half; right and left sides smooth, without depressions ; 
lower margin with a very faint depression in its anterior half; 
upper margin marked with sulcus, which in the middle of the 
hand curving downwards and backwards runs to the carpal joint. 
Carpus rounded above, not bearing a tooth ; meros three-sided, 
flattened below, not bearing a tooth above in front. Smaller 
manus simple, without constrictions or depressions ; dactylus, 
thumb, and upper margin of manus approximately equal in 
length ; carpus furnished with a blunt tooth above, equal in 
size to the carpus of the larger manus ; meros resembling the 
meros of the larger manus. 
In the second pair of legs the first carpal segment is as long 
as the second and the third together ; third about half the length 
of the second, equal in length to the fourth, shorter than the fifth, 
which itself is shorter than the second. v 
Meros and carpus of third and fourth pairs of legs not spined. 
In size and form resembling A. Kclivardsii , but differing from it 
in having the larger hand very lightly constricted above and below. 
Moreover, there is a large black spine on each side of the telson. 
Alpheus panamensis, Kingsley. 
1878. Alpheus panamensis, Kinysley, Bull. U.S. Geol. Surv. iv. p. 1.92. 
Carapace smooth, furnished in front with a strong rostrum, 
which projects considerably beyond the spines of the orbital 
hoods, almost as far as the second segment of the anteunular 
peduncle ; separated by a depression from the ocular hoods, each 
of which is furnished with a small sharp spine. 
Lower margin of hood continuous below the spine. 
Anteunular spine reaching slightly^ beyond the margin of the 
basal segment of the peduncle. Second segment of peduncle 
longer than the third, as long as the first. 
