ON ZGEAN INVERTEBRATA. 161 
Fusus syracusanus. 
lavatus.* 
Murex brandaris.* 
trunculus. ? 
fistulosus. ? 
Aporrhais pes-pelecani.* 
Dolium galea. ? 
Nassa prismatica. 
variabile.* 
granulata. ? 
Nassa cornicula ? 
Columbella rustica.* 
linneei.* 
Mitra savignii.* 
obsoleta. 
Marginella clandestina. 
Erato levis. 
Conus mediterraneus.? 
Dentalium 9-costatum.* 
multistriatum. 
FourtuH ReEGIon. 
It extends through fifteen fathoms of length between twenty and thirty-five 
fathoms. The sea-bottom is very various, mud and gravel prevailing, sandy 
tracts being very rare. uci are abundant, the characteristic species being 
Dictyomenia volubilis, Sargassum salicifolium, Codium bursa and fiabelli-., 
forme, and Cystoceira. The rare and curious Hydrodictyon umbilicatum was?" 
procured in this region on the coast of Asia Minor. Corallines are more 
frequent here than in the other zones. Porites dedalea occurs, but is very 
local. Retepora cellulosa is very abundant; several species of Yubulipora 
occur; Myriapora truncata and Cellaria ceramioides are characteristic spe- 
cies of this zone. Sponges abound, and some of the finest of those used in 
commerce grow here. Nullipore is abundant. Echinide are frequent, and 
Comatula. Crustacea are common, also Annelides. é 
Among Testacea the most generally distributed are Nucula margaritacea 
and emarginata, and Dentalium 9-costatum: those most prolific are Nucula 
margaritacea, Arca lactea,Cardium papillosum, Corbula nucleus, and Ligula 
boysii ; Dentalium 9-costatum and Cerithium lacteum. Mollusca tunicata are 
common in this region. 
TrEsTACEA oF Recion IV. 
Lamellibranchiata. 
Gastrochena cuneiformis. 

Lucina transversa. 
Solen tenuis.? lactea.? 
antiquatus.* spinifera. 
Ligula boysii.* Astarte incrassata. 
prismatica. Cytherea apicalis.* 
Kellia suborbicularis.* venetiana. 
Corbula nucleus.* Venus verrucosa. 
Neeera costellata.* ovata.* 
cuspidata.* fasciata. 
Pandora obtusa.* Cardium echinatum. 
Lyonsia striata.* erinaceum. 
Thracia phaseolina. leevigatum. 
Saxicava arctica.* papillosum.* 
Psammobia discors. exiguum.* 
ferroensis. Cardita sulcata.* 
Tellina donacina. squamosa. 
serrata. trapezia. 
balaustina. Area lactea.* 
Lucina commutata. tetragona.* 
digitalis. noe, ? 
1843, 
