170 REPORT—1843. 
Diagram or Reeions or Depru rn THE AEGEAN SEA (continued). 

: é : Depth i 
Sea-Bottom = deposits forming. Region. st ea Characteristic Animals and Plants. 

| Brachiopoda. 
Rissoa reticulata. 
Extent—156 feet. Pecten similis. 
Ground mostly nulliporous. Rarely} VII. — 
yellow mud, Echinus monilis. 
—_— 
105 |Plant :—Nullipora. 
Dentalium 5-angulare. 
Kellia abyssicola. 





Extent—750 feet. Ligula profundissima. 
Uniform bottom of yellow mud, Pecten hoskynsi. 
abounding for the most part in VII. 
remains of Pteropoda and Fora- | Ophiura abyssicola. 
minifera. 
Idmonea. 
230 Alecto. Plants :—0. 

Zero of Animal Life probably about 300 fathoms. 

Mud without organic remains. 

TRUE SCALE OF THE ABOVE DIAGRAM. 
















ZERO 

To all the eight regions only two species of Mollusca are common, viz. 
Arca lactea and Cerithium lima: the former a true native from first to last, 
the latter probably only a straggler in the lowest. Three species, namely, 
Nucula margaritacea, Marginella clandestina and Dentalium 9-costatum, are 
common to seven regions ; the second possibly owing its presence in the lower 
ones to its having dropped off floating sea-weeds. Nine species are common 
to six regions. 
Corbula nucleus. Turritella 3-plicata. 
Neera cuspidata. Triforis adversum. 
Pandora obtusa. Columbella linnei. 
Venus apicalis. Cardita trapezia. 
Modiola barbata. 
Seventeen species are common to five regions. 
Neera costellata. Pecten hyalinus. 
Tellina pulchella. varius. 
Venus ovata. Crania ringens. 
Cardita squamosa. Natica pulchella. 
Arca tetragona. Rissoa ventricosa. 
Pecten polymorphus. cimicoides. 
