8 
edge, anda second beneath, has a toothed margin opposed to that of the 
dactylos, and presents two longitudinal grooves on its under surface, the ante- 
rior groove terminating in a transverse depression; in the smaller hand the dac- 
tylos is laminate and in the same plane with the hand, which has an exterior 
spine like that of larger hand, and another on its inferior surface. The fixed 
finger of the larger hand is longitudinal, and has an almost straight edge; 
the annulations of the carpus of second pair are only four in number; there 
is no tooth on the lower apex of the third joint of the third and fourth pairs 
of legs. 
Two specimens from San Diego, found among kelp. 
Length of larger specimen, from joint of rostram to end of abdomen, 1.20 
inches; length of larger hand, half an inch, of smaller, 0.38. 
The carapace presents traces of a similar coloration to that of the hands. 
Alpheus equidactylus. 
A single dried specimen, broken, from Monterey, is all that we possess of 
this very distinct species. The larger hand has a transverse sulcus imme- 
diately posterior to the finger, and the movable and fixed fingers are of equal 
length and extended in the same place with the hand. The rostrum is 
narrow and sharp. 
Length, 0.75 inch. The fingers of the chelae shut close together when the 
hand is closed. 
Beteus longidactylus. 
Form much more compressed than in alpheus bellimanus ; hands similar in 
form; long and compressed; the fixed finger half the length of the hand, the 
movable one more than half that length; the fingers when closed gape widely; 
both are pointed at the end, and the points cross each other like the mandi- 
bles of a Loria. At the origin of the movable finger are several teeth, opposed 
to two large ones upon the hand itself, which also bears_a large tooth in the 
centre of the length of the fixed finger. 
Color of carapace of dried specimen, green, with nuances of russet and 
olive. The fingers of the larger hand are light red, the tips green. 
Length of carapace, 1.12 inch; of larger hand, 0.56 inch; of smaller, 0.36 in. 
A single specimen from San Diego, on a sandy mud flat, between tides. 
Hippolyte?, Hemphillit. 
I give this provisional name to a single specimen (dried), brought from 
San Diego by Henry Hemphill. Several of the feet are wanting, and the 
specimen is distorted so as to render a detailed description impossible. The 
rostrum is short and has four teeth, besides the long terminal tooth. The 
limbs are handed transversely with alternate dark and light tints. 
Length, 1 inch. 
Hippolyte lineata. 
4 7 
Rostrum less than half the length of the carapace, armed wile coven teeth 
_on the upper side (including the terminal one), and three on the lower; the 
