COKCHIPEKA. 



m 



Fig. 26*7 represents the animal of Panopcea glycimcria, aa 

 seen on the removal of the left valve and thin part 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, wrinkled epi- 

 dermis ; siphons united, thick, 

 contractile ; pedal orifice small, 

 in the middle of the anterior 

 gape; foot small (/), body oval 

 (6), 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 siphons; 

 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, 11 species. 

 Northern Seas, Mediterranean, 

 Cape, Australia, New Zealand, 

 Patagonia. Low water — 90 

 fathoms. 



Fossil, 140 species. Inferior 

 Oolite — . United States, Europe, 

 India. 



JFig. 267. Panopcea Glycautiiu 

 -f- Tlie size of the original. 

 a, a', adductor muscles ; p, posterior pedal 

 muscle ; r, renal organ. 



Gltcimeeis, Lamarck. 



Etymology, glukus, sweet, meris, bitter. 



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



Synonym, Cyrtodaria, Daud. 



