5-1 S 
ME. H. N. RIDLEY ON THE 
CARIDEA. 
Family P^LiEMONiDiE. 
Genus Alpheus {Fabricius) . 
17.98. Alpheus, Fabricius, Ent. Syst. Suppl. p. 380. 
1878. Alpheus, Kingsley, Bull. U.S. Geol. Surv. iv. p. 189. 
Alpheus Edwardsii ( Aud .). 
1809. Athanasus Edwardsii, Audouin, Explic. planches de Savigny, 
Descript, de I’Egypte, Atlas, pi. x. fig. 1. 
1818. Alpheus heterochelis. Say, Journ. Acad. Nat. Sci. Fhilad. i.p. 243. 
1884. Alpheus Edwardsii, Miers, Rep. Crust. H.M.S. ‘Alert,’ p. 284. 
Twenty-nine specimens. This species is common in the 
warmer parts of the Atlantic, Pacific, and Indian Oceans, and in 
consequence of its wide range and of the variations to which 
individuals are subject it possesses a long list of synonyms. 
These synonyms may be found upon reference to the above cited 
work of Mr. E. J. Miers. 
Alpheus minor, Say . 
1818. Alpheus minus. Say, Journ. Acad. Nat. Sci. i. p. 245. 
1837. Alpheus minus, Milne-Edwards, Hist. Nat. Crust, ii. p. 356. 
1878. Alpheus minus, Kingsley, Bull. U.S. Geol. Geogr. Surv. iv. p. 190. 
One specimen. 
This species occurs upon the east and west coasts of America. 
Kingsley records it from IN’. Carolina, Bermudas, Florida on the 
east, and from Pearl Island Bay (Panama) on the west. 
Alpheus Ridleyi, n. sp. 
Carapace and abdominal tergites smooth ; carapace furnished 
in front with a short pointed rostrum, which does not nearly 
reach to the second segment of the antennular peduncle ; 
rostrum separated by depression from the ocular hoods, each of 
which is furnished with a spine projecting in front as far as 
the extremity of rostrum. 
Anteunular spine reaching nearly to the second segment of 
the peduncle, which is the longest of the three, the third being 
the shortest. 
Antennal scale as long as antennal peduncle, longer than 
antennular peduncle ; basal segment of antenna furnished be- 
neath with a strong spine. 
Terminal segment of external maxillipede hairy. 
First pair of legs very unequal in size. Dactylus of larger 
hand closing vertically, with evenly rounded supero-anterior 
