ON ZGEAN INVERTEBRATA. 167 
Pecten dumasii. 
similis. ? 
fenestratus. ? 
concentricus. ? 
Terebratula truncata.* 
detruncata.* 
lunifera.* 
seminula.* 
Chiton leevis.* 
Lottia unicolor.* 
Pileopsis ungaricus. 
Emarginula cancellata. 
elongata. 
capuliformis. 
Fissurella greeca. 
Bullea aperta. ? 
Bulla utriculus. 
Natica pulchella. 
Eulima distorta. 
subulata. ? 
Parthenia elegantissima. 
Rissoa ventricosa.* 
reticulata.* 
ovatella. 
Turritella triplicata. 
Scissurella plicata ? 
Trochus tinei. 
exiguus.* 
millegranus.* 

Spondylus gussonii.* 
Ostrea cochlear. 
Anomia polymorpha. 
Palliobranchiata. 
Terebratula vitrea. 
appressa.* 
Crania ringens.* 
Gasteropoda. 
Turbo sanguineus. 
rugosus.* 
Phasianella pulla.* 
Cerithium lima.* 
Triforis adversum. 
Pleurotoma formicaria. ? 
crispata.* 
reticulata. 
maravigue.* 
gracilis.* 
Fusus muricatus.* 
Murex cristatus.* 
Nassa intermedia. 
Mitra ebenus.* 
phillippiana. 
Tornatella fasciata.* 
pusilla. 
globulosa. 
Marginella clandestina. 
Dentalium 9-costatum. 
5-angulare. 
E1cHtH REGION. 
The eighth region includes all the space explored below 105 fathoms, 
extending from that depth to 1380 feet beneath the surface of the sea, having 
a range of 125 fathoms, being more than twice the extent of all the other 
regions put together. Throughout this great, and I may say hitherto un- 
known province, for the notices we have had of it have been but few and 
fragmentary, we find an uniform and well-characterized fauna, distinguished 
from those of all the preceding regions by the presence of species peculiar to 
itself. Within itself the number of species and of individuals diminishes as 
we descend, pointing to a zero in the distribution of animal life as yet unvi- 
sited. It can only be subdivided according to the disappearance of species 
which do not seem to be replaced by others. 
Sixty-five species of Testacea were taken in the eighth region, eleven of 
which were procured alive. Of the total number 22 were Univalves, 3 of 
which were found living; 30 Lamellibranchiate Bivalves, 8 living ; 3 Pallio- 
pranchiate Bivalves, all dead, and possibly derived from the preceding region ; 
and 10 Pteropoda and Nucleobranchiata, also dead. Of these, 17 Univalves, 
23, Lamellibranchiata, and 3 Palliobranchiata occurred above 140 and under 
180 fathoms; 4 Univalves, 11 Lamellibranchiata, and 1 Palliobranchiate Bi- 
