Mr. C. Spence Bate on Crustacea. 119 
with the description of Crangon boreas that it is difficult to 
believe that they are not depauperized specimens of that large 
arctic species. 
Several specimens of Alpheus ruber have been taken on 
shelly ground off the Dudman,—and from the same locality 
two other specimens of A. Hdwardsii, which I believe is the 
first time that this latter species has been recorded as British. 
I had them alive for several days. Their colour is a bril- 
liant red crimson, A. ruber being rather paler and more banded 
than A. Hdwardsii. One peculiar and interesting feature in 
the structure of this animal is the alteration of the character of 
that portion of the carapace that covers and protects the organs 
of vision (not so much from the anterior development of the 
carapace as from the eyes having receded beneath it), which, 
while it offers protection to the organs of vision, yet has be- 
come so transparent that it is only by close and careful exami- 
nation that, in the living state, the relation of the two parts to 
each other can be distinguished. 
The next genus to which we have to allude is one that we 
believe must be described as new to our fauna. It was first 
described by Costa from a Mediterranean species (7ypton 
spongicola), as far back as 1844, in the ‘ Annali dell’ Acecad. 
degh Aspir. Nat. di Nap.’ i., also by Grube (Ein Ausflug 
nach Triest und Quarnero, pp. 65 & 125), and again by Hel- 
ler under the name of Pontonella (Verhandlungen des zool.- 
bot. Vereins in Wien, p. 627, Tafel ix. f. 1-15), as well as in 
his ‘ Crustaceen des siidlichen Europa,’ p. pl. f. . Be- 
lieving it to be distinct, I have given it the name of Typton 
spongiosus, of which the following is a short description :— 
Gen. char.—Carapace short and deep, covering the entire 
pereion. Pleon twice as long as the carapace, with the lateral 
walls deep. Eyes prominent, not concealed under the cara- 
pace ; superior antenne having a secondary branch. First pair 
of pereiopoda equal, slender, long, and chelate; second pair 
large, in general the right much larger than the left. 
Spec. char.—Carapace having a short simple rostrum. Eye 
longer than the rostrum. Anterior antennee with the secondary 
appendage longer than the primary ; posterior antennee having 
the squamiform plate of the third joint small, pointed, and not 
ciliated. Second pair of pereiopoda having the propodos as 
as long and nearly as eat as the carapace. Dactylos of the 
right hand with the cutting margin convex and simple, of the 
left hand less convex and cuneated. Posterior pair of pleo- 
poda with the posterior external angle of the outer ramus 
dentated, the inner tooth being the longest ; telson armed with 
