CONCHIPEEA. 



493 



Fig. 267 represents the animal of Panopcea gli/cimcris, as 

 seen on the removal of the left valve and thin } tii, of the 

 mantle. It was obtained on the 

 coast of Sicily, and presented to 

 the Gloucester Museum by Cap- 

 tain Guise. 



Mantle and siphons covered 

 with thick, dark, wi'inkled epi- 

 dermis ; siphons united, thick, 

 contractile ; pedal orifice small, 

 in the middle of the anterior 

 gape; foot small (/), body oval 

 (fe), with a prominent heel ; 

 pallial muscle {m) continuous ; 

 with a deep siphonal inflection 

 (s) ; lips broad and plain, palpi 

 triangular, deeply plaited {t) ; 

 gills unequal (much contracted 

 in spirit), reaching the com- 

 mencement of the sijDhons; 

 inner gills prolonged between 

 the palpi, plaits in pairs, each 

 lamina being composed of vas- 

 cular loops arranged side by 

 side ; margin grooved, dorsal 

 border of inner lamina unat- 

 tached ; outer gills shorter and 

 narrower, formed of a single 

 series of branchial loops placed 

 one behind the other, dorsal 

 border wide and fixed. 



Distribution, 1 1 species. 

 Northern Seas, Mediterranean, 

 Cape, Australia, New Zealand, 

 Patagonia. Low water — 90 

 fathoms. 



Fossil, 140 species. Inferior 

 Oolite — . United States, Europe, 

 India. 



fig. 267. J'(u. .</•'< Ghjcnncits 



I The size of the original. 



a, a\ adductor muscles ; p, posterior pedal 



miwcle ; r, renal organ. 



Glycimeris, Lamarck. 



Etymology, glukus, sweet, meris, bitter. 



Type, G. siliqua, PI. XXII., Pig. 14 and Fig. 268. 



(Synonym, Cyj'todaria, Daud. 



