476 Mr. W.N. Lockington on American Alphei. 
Kingsley (doc. cit.) says of the smaller hand:—“ cylindrical, 
constrictions but faintly indicated ; fingers three fourths as 
long as palm.” 
In my specimens the dactylus is about equal in length to 
the palmar portion of hand behind it, and there is a projection, 
almost amounting to a blunt spine, on the inner side at origin 
of dactylus. There is no spine at the distal end of the meral 
joints of the posterior pairs, which have the propodi spinulose 
beneath. 
The interior of the hands becomes more hirsute with age, 
many of the smaller specimens having only a few hairs on the 
fingers, while in some of the larger the distal portion of the 
hand is densely hairy. 
The larger individuals, on examination after only a few 
weeks’ exposure to alcohol, showed traces of a varied colora- 
tion; the tips of the fingers were black. 
Length of a large specimen 37 millims. A specimen 30 
millims. long has the larger hand 15 millims. 
Kingsley gives the following localities :— 
Fort Macon, N. C. (Dr. H. C. Yarrow); Smyrna and 
Key West, Fla. (A. S. Packard, Jun.) ; Lake Harney, Fla.; 
Bahama Islands (G. B. Goode); Bermuda Islands (G. B. 
Goode) ; Aspinwall (J. A. M‘Niel) ; Abrolhos, Brazil (C.F. 
Hartt); Panama (Ff. H. Bradley); Realejo, W.C. Nicaragua 
(J. A. M‘Niel). 
I have specimens from La Paz; San-José Island, Amorti- 
guado Bay; Mulege Bay and Port Escondido: all on the 
gulf coast of Lower California. Also from Magdalena Bay, 
west coast of Lower California. 
Alpheus affinis, Kingsley. 
Alpheus affinis, Kingsley, loc. cit. p. 195. 
This appears to be very near indeed to A. heterochelis. 
Loc. Panama (Ff. H. Bradley). 
Alpheus floridanus, Kingsley. 
Alpheus floridanus, Kingsley, loc. cit. p. 198. 
Loc. Fort Jefferson, Florida (Lieut. Jacques, U.S.N.). 
Alpheus spinicaudus, nov. sp. 
Rostrum very short, continued backwards between the eye- 
shields as a low carina; no ocular spines. 
Spine at base of antennule nearly as long as basal joint of 
peduncle; second joint of peduncle one half longer than third, 
