ON ZGEAN INVERTEBRATA. 145 

Found Ground. s Geographical 
living at f | Distribution. 
ce | ee | 
Species. Range. 






—_—. —-! 





Nucula, Lam. 
fathoms. fathoms. 
POL, Phil 3, ek 45-140 (0) mud, nullipore.| 1. 
margaritacea, Lam..| 2-95 3-40 mud, &c. a. |Lus., Celt., N. 
zgeensis, Morb. 185 185 mud. Yr. 
emarginata, Zam....| 7-50 7-45 mud, weed. | f. 
striata, Phil..........| 40-185 | 40-11 sand, mud. | f. 
Chama, Lin. 
gryphoides, Zin. ... 
Modiola, Lam. 
0-50 12-0 |rock, nullipore.| f. |Lus., Can. 
barbata, Zam. ......| 7-95 7-95 |mud,weed,null.| I. [Lus., Celt. 
tulipa, Lam. .........| 2-50 6-45 mud, &e. 1. |Lus., Celt. 
discrepans, Mont. ...| 10-40 10 weed. r. |Lus., Celt., N. 
marmorata, Forb....| 19-45 19 gravel. r. |Lus., Celt., N. 

Lithodomus, Lam. 
lithophagus, Zam....| _lit. lit. rock. f. 
Mytilus, Lin. [Lam. 
gallo-provincialis, lit. lit. rock, Ts 
minimus, Poli ......| lit. lit. rock. a. 
Pinna, Lin. 
squamosa, Lin....... 1-24 1 sand, mud. | f. |Can 
Lamellibranchiata Monomyaria. 
There are twenty-eight species of this division of bivalve Mollusca inha- 
biting the /Egean. Of these six are undescribed forms inhabiting the greater 
depths, being all found between 40 and 200 fathoms. Of the remainder, eight 
extend their range to the shores of Britain. Many of the species which else- 
where attain a considerable size are small in the Agean. The gregarious 
species do not there form great banks or beds as in other places. 
Of the new species found one only (Pecten hoskynsii) was observed fossil 
in the neighbouring tertiaries, and that one in a deposit of considerable age 
(ante-pliocene). Of the others, several are abundant in the pleiocene de- 
posits, at the period of the formation of which, however, they seem to have 
attained their full dimensions, and not to have been dwarfed as at the present 
day. Generally speaking, the proportion of dead valves greatly exceeds that 
of living shells of this section, brought up in dredge, and in the majority of 
species the valves become disunited after death and scattered. There are 
about twelve Monomyaria, which though inhabiting the western Mediterra- 
nean, do not seem to extend their range to the Aigean. 
Lamellibranchiata Monomyaria. 









o " Hy 
Species. Range. ie aa Ground. é Baeertical 
Avicula, Lam. fathoms. | fathoms. 
tarentina, Lam....... 20 20 mud. r. |Can. 
Lima, Brug. 
squamosa, Zam. ...| 1-69 1-28 | rock, gravel. | f. |Lus., Can. 
tenera, Turé.......... 0-30 @) sand, 1. |Lus.Celt.(Can. 
fragilis, Mont. ...... 20-40 | 20-40 nullipore. 1. |Lus., Celt., N., 
subauriculata, Mont. 15-30 | - O weed. ], |Lus., Celt., N. 
L 
1843. 
