MIMICKING A STAR-FISH 231 
the eye-stalks covered by the translucent anterior region 
of the carapace. ‘The inner flagellum of the first antennz 
has a tendency to bifurcate. The second antennz have a 
long flagellum and a strong scale with a subapical tooth. 
The mandibular ‘palp’ is short and two-jointed. The 
third maxillipeds are five-jointed. Spence Bate says that 
the second also are five-jointed. In de Haan’s figure they 
are six-jointed. In Spence Bate’s own figure they are ob- 
scurely, in Savigny’s figure they are clearly, seven-jointed. 
The trunk-legs of the first pair are unequal and unsymme- 
trical, the hand or sixth joint on the right side being gene- 
rally longer than that on the left, and more or less abnormal 
in form, especially in the male. The outer branch of the 
uropods has a transverse suture. The telson is broad and 
terminally rounded. The genus has a vast range between 
the north and south temperate zones, but seemingly con- 
fined to moderate depths. ‘A specimen of Alpheus minus 
has been recorded from an inland fresh-water pond in 
south-west Colorado.’ Spence Bate enumerates seventy 
species ; but with a warning that many of them are sepa- 
rated by trifling distinctions, and are probably at most 
not more than varieties. Referring to de Haan’s account 
of Alpheus avarus, Fabricius, he says that it appears to 
have no strongly marked feature separating it from Al- 
pheus Edwardsii (Audouin). Mr. E. J. Miers in his 
account of the latter species identifies with it not only 
de Haan’s Alpheus avarus, but some fourteen other names. 
On the other hand he considers that the avarus of Fa- 
bricius is distinct from that of de Haan. Alpheus comatu- 
larum, Haswell, is an eastern species said to be invariably 
found clinging to the. arms of a Comatulid star-fish, to 
which its variously distributed stripes and markings of 
purple and white and light and dark brown give it a 
general resemblance that is presumably protective. 
Alpheus ruber, Milne-Edwards, is occasionally taken 
on the English coast as well as in the Mediterranean. 
Alpheus megachéles, Hailstone, is identified by Canon Nor- 
man with the Alpheus affinis, Guise, from the Channel 
Islands, which is described as of a ‘deep scarlet colour, 
