184 C. Spence Bate on the Penerdea. 
The last of these three species I was not able, with the 
assistance of the accomplished curator, M. A. Milne-Hdwards, 
to find, the label probably having been lost in the hasty 
removal of the specimens during the unhappy siege and com- 
munistic occupation of Paris. 
The first two belong to the present genus, established 
by M. Lucas (‘Annales Soc. Entomologique de France,’ 
Février 1849, p. 215, pl. vi. no. 11) on Penceus siphonoceros 
of Philippi (Archiv fiir Naturgesch. p. 190, pl. iv. fig. 3, 
1840), which he named Solenocera Philippit, trom a specimen 
that he captured off the coast of Algiers. 
Solenocera differs from Peneus in having the flagella of the 
first pair of antenne not only longer than the carapace, but 
having one branch broader than the other and hollow on 
the inner side, so that the less robust flagellum may rest. lon- 
gitudinally in the larger, and by having four teeth on each side 
of the carapace, one at the outer orbital angle, one supraor- 
bital, one hepatic, and one near the antero-inferior angle of the 
carapace. 
The branchie also differ from those of Peneus in having 
two arthrobranchial plumes attached to the penultimate pair of 
pereiopoda, and one arthrobranchial and one podobranchial 
plume attached to the first pair of gnathopoda, and may be 
tabulated as follows :— 
Pleurobranchia ............ 1 del al la 
Arthrobranchi#............ Pi D2) 22> 9S Oe 
Podobranchia.............. Boas eres <a a 
Mastibranchia ............ hele al Si al ee Lie 
htkitimn io 
Solenocera membranacea, Fabr. 
Milne-Edwards describes this species as being carinate 
for the entire length of the carapace. ‘The extremity of the 
rostrum is a little turned upwards, and is very short, not 
extending beyond the eyes, with five or six teeth on the 
upper surface, and ciliated on the lower. Hye large and 
short, the flagella of the first pair of antenne being much 
longer than the carapace, one slender and cylindrical, the 
other broad, flat, and ciliated on the inner side. 'Telson long 
and styliform, grooved on the upper surface, the margins of 
which terminate on each side in a sharp-pointed tooth. 
Length about 3 inches. 
Inhabits the Mediterranean. 
Solenocera Philippii, Lucas, appears to me to be the same 
species; but, according to the author’s figure, the extremity 
of the larger flagellum of the first pair of antenne: terminates 
