ON ZGEAN INVERTEBRATA. 165 
Sixty RecGion. 
It extends through a range of twenty-four fathoms, between fifty-five and 
seventy-nine fathoms, Nullipore is the prevailing ground. Fuci have become 
extremely rare. Cidaris histrix is the characteristic Echinoderm. Several 
starfishes are not uncommon. Venus ovata, Cerithium lima, and Pleurotoma 
maravigne are the most generally diffused species. Z’urbo sanguineus, Kmar- 
ginula elongata, Nucula striata, Venus ovata, Pecten similis, and the various 
species of Brachiopoda those most prolific in individuals, 
It will be observed, that although Fuei have become extremely scarce, and 
in the next zone altogether disappear, there are still a considerable number 
of Phytophagous Testacea. These are mostly found on “coral” ground, that 
is, on a clean bottom abounding in nullipore. Now that the observations of 
M. Decaisne, M. Kutzing and others have so clearly proved the vegetable 
nature of that singular production, so long regarded as a zoophyte, the source 
of the food of the Holostomatous Testacea in these deep regions is no longer 
problematical, 
TesTAceEA oF Recion VI. 
Lamellibranchiata. 
Ligula profundissima. Arca lactea.* 
Kellia suborbicularis.* scabra. 
Corbula nucleus.* imbricata. 
anatinoides, tetragona.* 
Neeera cuspidata. Pectunculus pilosus.* 
costellata.* Nucula polii. 
abbreviata. margaritacea. 
Pandora obtusa.* striata.* 
Lyonsia striata.* 
Thracia pubescens. 
Saxicava arctica.* 
Kellia abyssicola.* 
Lucina commutata. 
bipartita,* 
Astarte incrassata. 
pusilla. 
Cytherea apicalis. 
Venus ovata.* 
fasciata. 
Cardium papillosum. 
echinatum. 
minimum, 
Cardita squamosa.* 
trapezia, 
Terebratula truncata,* 
detruncata.* 
cuneata.* 
Chiton levis. 
Lottia gussonii. 
Modiola barbata. 
Lima squamosa. 
elongata.* 
crassa. 
Pecten jacobeeus. 
dumasii. 
Tepe de 
yalinus. 
testee. 
varius.* 
pusio. 
pes felis. 
similis.* 
fenestratus. 
concentricus. 
Anomia polymorpha. 

Palliobranchiata. — 
Terebratula seminula,* 
Crania ringens, 
Gasteropoda. 
| Lottia unicolor.* 
| Calyptreea sinense. 
