366 Mr. E. J. Miers on Crustacea from 
of the carapace (which is slightly concave on each side of 
its base), but not prolonged backward as a dorsal carina. 
Orbital arches entire, arcuated, without spinules. Anterior 
margin of the carapace sinuated on the sides, without spines. 
Postabdominal segments smooth, entire, with the lateral 
margins broadly rounded ; terminal segment not three times 
as long as broad at the base, with its distal end subtruncated. 
Eyes completely concealed beneath the carapace. Antennules 
with three joints of the peduncle exposed, of which the middle 
one is slightly the longest, with a small spine-like scale at 
base, reaching nearly to the end of the basal joint. Basal 
scale of antennee about reaching to the end of the antennal 
peduncle, with the outer margin nearly straight and ending 
in a small spine, and the inner margin convergent towards it 
and clothed with long hairs. Anterior legs or chelipedes 
having the merus and carpus slender; merus with a small 
tooth or spine at the distal end of its under margin; palm of 
larger chelipede rather more than twice as long as broad, 
smooth, without notches or ridges, largest at its rounded basal 
end, with an impressed curved line on its upper and proximal 
end; fingers nearly half as long as the palm ; the upper with 
its superior margin arcuated. Smaller chelipede with the 
carpus rather longer, and chela very slender, fingers hairy. 
Second legs with first jomt of the carpus longer than the 
second, the last three joints of nearly equal length, the last a 
little the longest, the joint preceding these somewhat longer. 
Ambulatory legs somewhat hairy. Distal ends of the rami of 
the uropoda clothed with long hairs. Colour light yellowish 
(in spirit). Fingers of larger chelipede pinkish. Length 
7 lines (nearly 15 millim.). 
Two females with ova are im the collection. 
Several species of this very difficult genus have been re- 
corded from the Cape-Verd Islands; it may therefore be 
useful to note that Alpheus paracrinitus may be distinguished 
from Alpheus pugilator and A. rugimanus, A. M.-Edwards*, 
Alpheus streptochirus, Stimpsont, and Alpheus Hdwardsit 
(Audouin) {, by the absence of spinules from the orbital 
arches (not to mention other characters), and from Alpheus 
Bouviert, A. M.-Edwards (é. c. p. 231), by the form and in- 
sculptation of the larger chela. 
From the well-known Mediterranean A. ruber it may be 
distinguished by the form of the rostrum and of the larger 
chela. 
* Bull. Soc. Philomath. de Paris, ser. 7, ii. pp. 229, 280 (1878). 
+ Proc. Ac. Nat. Sci. Philad. p. 80 (1860). 
{ Explic. des planches in Savigny’s Cr. de l’Egypte, pl. x. fig. 1. 
