156 REPORT—1843. 
pavonia is the characteristic Fucus of the belt of the first region, and among 
its elegant fronds may be seen innumerable Crustacea prowling, whilst in the 
crevices of the rocks on which they grow live numerous fishes of the blenny 
and wrasse tribes, like all the other natives of this province, remarkable for 
the vivid painting of their skins. 
The inhabitants of the lowest portion of this narrow but varied belt are 
equally characteristic, especially such as live on the sandy tracts covered with 
Zostera. The Pinna squamosa is most abundant here, and in rocky places 
the cuttle-fishes abound. On the Zostera live numerous Fissoa. 
Besides its true inhabitants, the littoral zone is continually receiving acces- 
sions to its fauna from the washing up of the exuvie of the animals of the 
succeeding region, especially after storms, which strew the sandy shores with 
the remains of Mollusca. Mingled with these are the remains of freshwater 
animals carried into the sea by the streams. These are not necessarily found 
in the immediate neighbourhood of the streams by which they are brought 
down, but seem to be carried along the shore by eddies and currents, so that 
in a deep bay they may frequently be found at the opposite part of the shore 
to that where the stream which doubtless wafted them to the sea emptied 
itself, the depth of the intermediate gulf precluding the notion that they could 
have been washed across. Whilst the sea one day casts up numerous shells, 
Crustacea, &c., it often covers them up with silt the next, so that increasing 
alternations of organic bodies and sand or mud must be continually in pro- 
cess of formation in this region. 
TEsTACEA OF Recion I. 

Lamellibranchiata. 
Clavagella © Mesodesma donacilla.* 
Solen siliqua. Venus gallina.* 
Solecurtus strigillatus.* decussata.* 
Ligula sicula. geographica. ? 
Mactra stultorum.* Cardium rusticum. 
Kellia corbuloides.* edule.* 
rubra.* Cardita calyculata.* 
Tellina donacina. : trapezia.* 
fragilis. Arca barbata.* 
planata. lactea.* 
Lucina pecten. noe.* 
digitalis. ? Lithodomus lithophagus.* 
lactea.* Mytilus gallo-provincialis.* 
desmarestii.* minimus.* 
Venerupis irus.* Pinna squamosa.* 
decussata.* Lima squamosa.* 
Donax trunculus.* tenera. ? 
complanata. Spondylus gadzropus.* 
semistriata. Ostrea plicatula.* 
Gasteropoda. 
Chiton squamosus.* Patella scutellaris.* 
cajetanus.* ferruginea.* 
fascicularis.* bonnardi.* 
Note.—The asterisk indicates that the species attains its maximum of development in that 
region; the note of interrogation implies that the species is probably a straggler. 
