ON ZGBEAN INVERTEBRATA. 159 
Emarginula huzardii. 
Bulla hydatis.* 
cornea. 
ovulata. 
striatula. 
truncatula.* 
turgidula, 
Natica valenciensii.* 
pulchella. 
olla.* 
Eulima polita.* 
subulata, 
, Parthenia elegantissima, 
Odostomia conoidea. 
Rissoa desmarestii.* 
ventricosa.* 
oblonga.* 
violacea,* 
radiata.* 
cimicoides.* 
montagui.* 
buccinoides.* 
pulchella.* 
acuta. 
Sealaria communis. 
Turritella triplicata. 
terebra.* 
Nerita viridis.* 
Dentalium 9-costatum.* 
multistriatum.* 
entalis.* 
fissura.* 
Trochus canaliculatus.* 
racketti.* 
spratti.* 
fanulum.* 
Trochus adansoni.* 
conulus.* 
crenulatus.* 
gravesi.* 
exiguus.* 
Turbo rugosus.* 
Phasianella pulla.* 
intermedia.* 
vieuxii.* 
Cerithium lima.* 
angustissimum. 
Triforis adversum.* 
Pleurotoma formicaria.* 
reticulata spinosa.* 
attenuata.* 
linearis.* 
Fusus syracusanus,* 
lavatus.* 
lignarius. 
Murex brandaris.* 
trunculus.* 
edwardsii.* 
fistulosus.* 
Ranella gigantea.* 
Nassa reticulata,* 
variabile.* 
musiva. 
granulata.* 
macula.* 
mutabile.* 
Columbella rustica.* 
linnzei.* 
Mitra obsoleta.* 
Marginella clandestina.* 
Ringuicula buccinea.* 
Conus mediterraneus.* 
Tuirp REGION. 
In this region, which extends from ten to twenty fathoms, the sea-bottom 
is very generally gravelly in places, great tracts of sand also being common. 
The Caulerpa and Zostera are still found, but cease towards its lower part. 
It may be regarded as a zone of transition presenting but few peculiarities. 
A very small and beautiful species of Asterina abounds on the fronds of 
Zostera here, and the large Holothurie are still abundant. Aplysi@ and the 
blue Goniodoris are the characteristic Mollusca. Lucina lactea, Cardium 
papillosum, Tellina donacina, and Cerithium lima are the Testacea most 
generally distributed. The species most prolific are Cerithium lima, Cardium 
. papillosum, Ligula boysii, Nucula margaritacea and emarginata, Lucina lactea 
and hiatelloides, so that bivalves would appear to prevail. 
Testacea oF Recion III. 
Solen tenuis. ? 
Lamellibranchiata. 
Solen antiquatus,* 
