Mr. W. N. Lockington on American Alphei. 467 
of the common “ abalone”’ . (Haliotis rufescens, Swains.). As 
this mollusk extends far towards the north, we may expect to 
hear of B. equimanus from more northern localities. At pre- 
sent it is known only from Catalina Island and Santa Bar- 
bara, California. 
As I have not in my possession any foreign species of the 
genus, and have not seen several of the species lately described 
by Kingsley, I shall in this place separate Beteus only, and 
treat of the rest of the group as one genus, divided into sec- 
tions by the characters of the front and hands, for convenience 
in future identification. 
The letter P indicates that the species belongs to, or has 
been found upon, the Pacific coast, while A indicates the 
Atlantic species. 
The species I have had an opportunity to examine are 
marked thus, !. 
Synopsis of the North-American Alphei. 
A. Rostrum present. 
a. Ocular spines present 
A sulcus between eye-shields and rostrum : 
larger hand complexly sulcated, with a 
superior and an external spine; dactylus 
swollen at the tip, working horizontally : 
smaller hand with asuperior spine. Me- 
ral joints of posterior pairs with a spine 
below ; propodi spinulose ........... . A, clamator! P. 
No sulcus between eye-shields and rostrum: 
larger hand as in clamator; dactylus la- 
minate, closing horizontally : smaller hand 
with superior and exterior spines. No 
spines on meral joints of posterior pairs ; 
propedispmulose. tte citkys ws cee Riese 0:8 A, bellimanus! P. 
No spine on basal joint of antenne : larger 
hand with superior and external spines, 
sulcate; dactylus vertical (?): smaller 
hand with superior spine. Posterior 
pairs without meral spines; propodi spi- 
MEPIRCERES os eens teh ae cet aaa ayes wees ee ages ake A, barbara*, P. 
Antennal scale regularly elliptical; larger 
hand a third longer than carapax, with a 
spine above and a smaller one near it. 
Propodi of posterior pairs spinulose .... A. minor! A. 
Basal spine of antennulee reaching to end of 
second joint of antennular peduncle ; 
smaller hand (?) without spines. Penult. 
joint of abdomen with lateral spines.... A. equedactylus! P. 
Orbital spines arising from superior surface 
of carapax, margin continuous beneath 
them; larger hand spineless; smaller 

* = A, clamator, Kingsley. 
