192 KELLIID.E. 



Clark does not mention any. Nor do we know what it 

 feeds on. According to Mittre it lives on the roots and 

 leaves of fuci; but at Herm these sea- weeds are not 

 found in the spots frequented by the Galeomma. He 

 observes that they look like beautiful pearls, when seen 

 beneath the water at a depth of from three to four 

 fathoms. Mr. Dennis remarks, in a note with which he 

 has kindly favoured me, " How surprisingly tough the 

 animal of Galeomma Turtoni is quite like a limpet ! 

 They occurred at Herm in little colonies, invariably 

 where a large loose piece of granite rested against the 

 solid rock, and never under stones which lay flat." The 

 shell resembles that of Lima in its composition and 

 structure. Mr. Norman's cabinet contains a specimen 

 having a longitudinal fold in the middle of the front 

 margin, and resembling in that respect a monstrosity of 

 Pisidium fontinale, which I noticed in page 26 of the first 

 volume of the present work. 



This species is the Hiatella Poliana of Costa, H. striata 

 of Delle Chiaje, and Parthenope formosa of Scacchi. 

 Nardo states that it is the Tellina aperta of Renier. 



Family VIII. KELLI'ID^E, (Kelliadce) Forbes 

 and Hanley. 



BODY oval or suborbicular, gelatinous : mantle open in front, 

 as well as in most genera on the posterior side to form an ex- 

 cretal tube ; it has only a single lobe, the margin of which is 

 fringed with cirri : gills 2 on each side : foot long and exten- 

 sile : byssus slight. 



SHELL triangular, oval, oblong or subglobose, equivalve, 

 more or less, inequilateral, thin, variously sculptured, com- 

 pletely closed : epidermis slight : beaks calyciform : cartilage 

 internal: hinge furnished with cardinal or lateral teeth, or 

 with both. 



