BRITISH STALK-EYED CRUSTACEA. 199 
With regard to arrangement, we propose to follow the classi- 
fication of M. Milne-Edwards, as used in his ‘ Histoire Naturelle 
des Crustaces’; and will deal first with the genus. 
STENORHYNCHUS, Lam. 
This genus belongs to a wide order, popularly described as 
“Spiders,” though the species in it deserve this title more than 
those of several allied genera which are nevertheless known by 
the same name. 
In the species of this genus the body is usually about three- 
quarters of an inch long, roughly triangular in shape, with the 
lower angles rounded and the forward one continued acutely 
into a rostrum varying in length in different species. The 
carapace is symmetrically spinous; the legs long and slender; 
the rostrum tapering and dual; the abdomen six-jointed; the 
eyes oval and fixed on a prominent stalk or peduncle and are 
non-retractile. 
“The young of Stenorhynchus” (says Mr. Spence Bate, p. 85, 
Brit. Assoc. Rep., 1869), ‘“‘is a true zoé, but differs from the 
typical form in the absence of the great rostral spine, and in the 
increased length of the great dorsal spine, by a series of latero- 
dorsal spines on the three posterior somites of the pleon, and in 
the enormous development of two deciduous spines on the base 
of the second pair of antenne.” 
In the lists of British Crustacea hitherto published, carci- 
nologists have only given two species of this genus as indigenous 
to Britain, viz., Stenorhynchus rostratus (= phalangiwm of Pen- 
nant), and S. longirostris (= tenuirostris of Leach), but we have 
now the pleasure of adding a third, the S. egyptius of Milne- 
Edwards. This we shall describe in its place. 
Specimens of this genus may be dried rapidly, but care- 
fully, for the cabinet, without dissection. But specimens of 
all should also be preserved in spirit for careful examination 
when required, as dried examples are not so well adapted for 
that purpose. 
To explain more fully the points of difference in the rostra 
and frontal appendages of the three species of the genus 
Stenorhynchus, we have made the sketches, three times larger 
than life, which appear in each case with the descriptions. 
