32 THE MOLLUSCA OF DURSETSHIRE. 
Order PROSOBRANCHIATA. 
Respiration, bronchial, or pulmonary gland;species mostly 
aquatic ; some frequent brackish water, others freshwater, 
some are terrestrial. The respiratory organs are modified 
to meet this difference of habit. 
Sub-order PEcTINIBRANCHIATA. 
A. TOXOGLOSSA. 
CONIDZ. 
MANGILIA, Risso, 1826 (Mangelia). 
114. M. nebula (Mont.) Mangelia nebula, Mont. 
Pulteney, p. 46, pl. 14, f. 16. 
Weymouth, 7. Racketts. 
White Nore (dredged), W. Thompson. 
115. M. attenuata (Mont.) 
A southern species and rather scarce. 
Between Studland and South Haven, Carleton Green. 
Fossil: Pliocene, Calabria, and Taranto, Philippi. 
116. M. striolata (Scacchi), Philippi, non Risso. 
Forbes and Hanley, Vol. iii., p. 483, pl. 114a, f. 1, 2. 
A very rare Dorset shell. 
Weymouth, dredged ten fathoms (dead), J. Hanley. Largest 
example, rather more than eight lines, and about two and 
a-half lines broad. 
Fossil: Pliocene, Sicily. 
117. M. brachystoma (Philippi). 
A very rare Dorset shell. 
Brit. Conch., Vol. iv., p. 382. 
Habitat: mud among stones, and muddy sand. 
Weymouth, Thompson. 
Taken in 50 fathoms off Cornwall by McAndrew; also 
found in shallow water off Torquay, E. R. Sykes. 
