APORRHAIS, CERITHIUM. 85 
FAMILY APORRHAID&, T'roschel. 
APporRHAIS, Da Costa. 
* Aporrhais pes-pelecani, Linné. 
Strombus pes pelecani, Linné; Aporrhais quadrifidus, Da 
Costa ; Rostellaria pes pelecani, Lamarck ; Chenopus pes 
pelecani, Philippi. 
Habitat—In mud, gravel, and muddy sand and nullipore 
—in fact everywhere except on rocky ground and amongst 
large clean stones—from about 8 fathoms downward; very 
common. ‘Truncated specimens are often met with; these 
are usually aged individuals. Young shells are also occa- 
sionally obtained which have the spire more or less bent. 
Some of the aged shells have the interior of the mouth 
stained a rich sea-green colour. 
British distribution—Throughout all our seas, chiefly in 
the Coralline zone; a common shell. 
Foreign localities —TVhroughout northern and western 
Kurope, from Iceland (Verkriizen) to Gibraltar (MA ndrew), 
as well as the Mediterranean, Adriatic, and Aigean Seas, and 
reaching to the Sea of Marmora (Spratt). 
FAMILY CERITHUDA, Fleming. 
CERITHIUM, Adanson. 
* Cerithium reticulatum, Da Costa. 
Strombiformis reticulatus, Da Costa; Turbo punctatus (2), 
Innné; Murex seaber, Olivi ; Murex acuminatus, Pen- 
nant; Murex reticulatus, Pulteney. 
Habitat.—Below stones at low water and down to 2 or 8 
fathoms in the Laminarian zone ; not plentiful in my experi- 
ence, but Mr. Norman states that it is “the most abundant 
shell in the district.” Dead shells and fragments are very 
common down to considerable depths. 
British distribution—South and west of England, all 
Ireland, and western coast of Scotland as far north as the 
Hebrides and Orkneys; rather common, and occasionally 
abundant. It frequents the lower part of the Littoral and 
the Laminarian zones. My. Jeffreys has taken this species 
from off Scarborough in May, 1875 (Leckenby and Marshall 
in Annals, Dec. 1875). Except at the ballast ports I am not 
aware that this species, so common elsewhere, has been found 
on the east coast, with the above exception. 
