212 



POPULAR CONCHOLOGY. 



Cymbulia. Peron and Lesueur. — Shell 

 cartilaginous, very transparent, crystalline, ob- JX. 

 long, in the shape of a shoe, truncated at the 

 summit; aperture lateral. Animal, body oblong, 

 transparent, enclosed in the shell ; head having 

 two eyes and two retractile tentacula, fins 

 large with a three-pointed body between. — 5 

 species, recent. 



This singular shell is as transparent as glass, 

 and the form most beautiful, as is shown by the 

 figure above, of C. Peronii. So werby says this 

 beautiful object can hardly be called a shell, Pe ™»«- 

 for it is in no wise testaceous ; he calls it a boat-shaped 

 integument of a transparent horny substance. It is oc- 

 casionally thrown on the shore at Nice, in the Mediter- 

 ranean, and in the Indian sea. 



Eurybia. Rang. — Shell cartilaginous, membrana- 

 ceous, thin, transparent, shaped like a hood; aperture 

 round and spread out. Animal globular ; having two wings 

 on each side of the mouth; the intermediate lobe very 

 small, and of a triangular form. — 2 species. 



Found in the Atlantic. 



Psyche. Rang. — Shell none, or very thin, and mem- 

 branous. Animal, body free, membranous, without any 

 distinct head ; tentacula none ; wings two, elongate without 

 any intermediate lobe. — 1 species. 



P. Glohulosa is found on the Newfoundland coast, 



Tiedemannia. Delle chiage. — Shell none. Animal, 

 body gelatinous, transparent ; neck elongated ; tentacula 

 two ; wings very large, wedge-shaped. — 1 species. 



T. Neapolitana is found in the Mediterranean. 



