ON ZGEAN INVERTEBRATA, 169 
Palliobranchiata. 
Terebratula detruncata. 
vitrea. 
Crania ringens. 
Gasteropoda. 
Lottia unicolor. 
Bullea aperta. 
angustata. ? 
alata. 
Bulla utriculus. 
cretica. 
Eulima subulata. 
Parthenia ventricosa. 
turris. 
fasciata. 
Rissoa reticulata. 
ovatella. 

Rissoa acuta. ? 
Sealaria hellenica. 
Scissurella plicata. 
Trochus millegranus. 
Cerithium lima. ? 
Pleurotoma abyssicola. 
Fusus echinatus. 
Nassa intermedia, var. 
Marginella clandestina. 
Dentalium quinquangulare. 
9-costatum P 
The following Diagram exhibits the comparative characters and relations 
of the several regions :— 
DraGRam or REeGIons OF DEPTH IN THE AGGEAN SEA. 
a 
Sea-Bottom = deposits forming. Region. 


Extent—12 feet. 

Ground various. Usually rocky or Te 
sandy (conglomerates forming). 
Extent—48 feet. 
1B 
Muddy. Sandy. Rocky. 
Extent—60() feet. 
Ground mostly muddy or sandy.| III. 
Mad bluish. 

Extent—90 feet. 
Ground mostly gravelly and weedy. Iv 
Muddy in estuaries, ‘ 
Extent—120 feet. 
We 
Ground nulliporous and shelly. 
Ca 
Extent—144 feet, 
Ground mostly nulliporous. Rarely; VI. 
gravelly, 
ee 

ere Characteristic Animals and Plants. 

Littorina ccerulescens, 
Fasciolaria tarentina. 
Cardium edule. 

2  |Plant:—Padina pavonia. 
Cerithium vulgatum. 
- Lucina lactea. 
Holothuriz. 

10 {Plants :—Caulerpa and Zostera. 
a See ele a 
Aplysie. 
Cardium papillosum. 
Ascidiz. 
Nucula emarginata, 
20 
Cellaria ceramioides. 
Plants :—Dictyomenia volubilis. 
| ? 
| Codium bursa, 
Terr Eee ee Ee 
| Cardita aculeata. 
| Nucula striata. 
Pecten opercularis, 

Myriapora truncata. 

| 
55 |Plant :—Rityphleea tinctoria. 
Venus ovata, 
: Turbo sanguineus. 
Pleurotoma maravigne. 

Cidaris histrix. 

ee 
79 |Plant:-—N ullipora, 
