Mr. W. V. Guise on a new species of Alpheus. 51 
external face; lower margin obtuse; moveable finger much 
shorter than the immoveable one. A spine upon the upper 
margin of both arms at some distance from the termina- 
tion.” 
It will be remarked that nothing is here said concerning the 
character of the anterior portion of the carapace; but as this 
species is said to be “ trés voisine de la précédente ” (“ Alpheus 
brevirostris,’ a new Holland species), which is characterized as 
having the border of the supra-orbital hood rounded and without 
spines, it is to be inferred that the like character also applies to 
_ A, ruber. 
Alpheus Edwardsii. “ Very closely allied to the preceding. Ante- 
rior borders of supra-orbital vaults armed with a spine, so that 
- the front presents three nearly equal teeth. The second joint 
of the superior antennz about half as long again as the first. 
Lamellar appendage of the external antennz dilated a little 
within towards the end, and not passing the footstalk of the 
superior antenne. Pedipalps very narrow towards the end, 
and extending beyond the footstalk of the superior antenne. 
Anterior legs nearly of the same form as in the preceding 
species, but more enlarged, and having the pincers more 
irregular ; those on one side slender and lengthened.” 
Alpheus dentipes. ‘“ Closely allied to the preceding : having like- 
wise the supra-orbital vaults prolonged into points, but 
having the two anterior legs nearly of the same size; the 
pincers of the smaller large at the base, but becoming ex- 
tremely narrow towards the end; having the third articu- 
lation of the second, third and fourth pairs of legs armed 
with a pointed tooth externally, at one-third the length of 
each.” " 
Upon comparison of my Channel Island individual with the 
three species described above, I find the following points of 
agreement and difference between them. 
It assimilates with A. ruber in having the larger hand fur- 
nished with longitudinal carine on the upper and the outer 
surface ; 
Differs, in not having the moveable finger shorter than the 
immoveable one ; and essentially in the spinous armature to the 
supra-orbital hoods. 
It assimilates with A. Edwardsii in having the anterior edge 
of the supra-orbital hoods armed with short spines; and in 
having the second joint of the superior antenne half as long 
again as the first ; 
E2 
