PTEROPODA. 



CuViERIA. Fig. 6. 



Testa subcylindrica, vitrea, hyalina, tenuissima, fragil- 

 lima, medio ventricosiuscula, infra obtusa, clausa, 

 superne subcompressa, apertura magn^, oblonga; 

 latere dorsali elevatiusculo. 



Shell subcylindrical, glassy, transparent, very thin and 

 brittle, rather ventricose in the middle, obtuse and closed 

 below ; slightly compressed at the superior extremity, 

 with a large oblong opening, dorsal margin rather higher 

 than the ventral. 



Found in the Mediterranean. 



Cymbulia. Fig. 7. 



This Pteropod of which we have added three representa- 

 tions, with its boat-shaped integument, has no shell, 

 though it has usually been described as having one. We 

 do not therefore give any description of it, and only 

 observe that the above-mentioned boat-shaped integument, 

 which has been described as a gelatinoso-cartitaginous 

 shell, is an exceedingly transparent horny substance, not 

 in any wise testaceous. This with its animal is occasion- 

 ally thrown ashore at Nice. 



