CEPHALOPODA GASTROPODA. 
133 
compression of a small volume of air, some cubic centimetres, 
ill the last or dwelling-chamber of the shell ; the principal 
function of the siphon is said to be to keep a general equilibrium 
between the air included in the chambers and the pressure of 
the surrounding water for longer intervals by diffusion through 
the membrane of the siphon, this action being too slow to come 
into operation for the locomotion itself. Arch. f. Nat. 1871, 
pp. 1-34. 
S. TiiiNCHESFi’s memoir on the nervous system of the Cephalopocls, pub- 
lished in 1858, is extracted in full. 13ull. mal. Ital. iii. pp. 100-112. 
Omastrc2yhes sayittatus (Lam.), Gould, Invert. Mass. p. 610, pi. 26. fig. 340, 
and hartramii, probably the same species, fig. 339. 
Loliyopsk imvo (Lesueur), Gould, Invert. Mass. p. 609, pi. 20. figs. 341- 
344, New England. 
PTEROPODA. 
Creacis cornea, sp. n., Costa, Ann. Mus. Nap. iii. 1809, Naples. 
Tricliocyclus mediterraneus, sp. n., Costa, Ann. Mus. Nap. iii. 1809, Naples. 
HETEROPODA. 
Reclnzia hargravesi, sp. n., Cox, P. Z. S. 1870, p. 172, Port Stephens, New 
South Wales. 
GASTROPODA. 
rECTINIBEANCIIIATA. 
Proboscidifera rhac higlossa. 
Muricid^. 
Mtirex. The continuation of Kiister’s Monograph, part iii., contains 18 
species, some copied from Peeve: — M. semiclausus, sp. n., p. Ill, pi. 34. 
figs. 0, 7, hah. — ? ; immilus, sp. n., p. 118, pi. 36. f. 9, 10, hab. — ; ? undatus, 
Chemn., p. 121, pi. 30. f. 7, 8, East Indies. The rest are well-known species, 
Murex coshdatus (Chiereghini, MSS.) is substituted for Fusus hcllerianus, 
Brusina, = Murex lueinkauffianus, Crosse, 1800. Brusina, Chieregh. 
Conch, p. 163. 
Murex gihhosus (Lam.). WeinkaufF is inclined now to regard it as a 
variety of M. erinaceus, L. Bull. mal. Ital. iii. p. 80. It is figured by A. 
Manzoni from a fossil pliocene specimen, 1. c. pi. 2. figs. 4, 6. 
Murex erythrccus, sp. n,, Fischer, J. de Conch, xviii. p. 170, Red Sea j 
allied to M. calcitrapa (Lam.). 
Murex pazi, Crosse, figured, J.de Conch, xviii. p. 99, pi. 1. fig. 4,West Indies, 
on deep-sea coral bottom. 
Murex senegalensis, Lam., and Turbinella muclleri, Bunker, feeding on a 
species of Ceiithium, the first making a hole in the shell, the other attacking 
it at the mouth, observed by Fr. Muller, Jen. Z. Nat. vi. p. 67, footnote. 
Typliis duplicatus, sp. n,, Sowerby, P. Z. S. 1870, p. 251, pi. 21. f. 1, China 
Seas. 
