PULMONAKY GASTEROPODS. 



425 



edges milled within the long, narrow, and curved opening, with teeth 

 upon the left edge, and with a few ripples on the right edge. The 

 Ovula are inhabitants of the Indian Ocean and Chinese Seas. Some 

 few species, however, belong to the Mediterranean and the Black Sea. 

 The three species represented in Figs. 262, 263, and 264, present very 

 singular contrasts of form and size. 



Fig. 264. Ovulum volva (Linnseus). 



The second family, Volutidse, contains Mitra and Voluta. 



MlTRA. 



The Mitres are so called from their resemblance to the bishop's 

 mitre. They are natives of warm climates, such as the Indian Ocean, 

 the Australian Seas, and the Moluccas. The shell of the Mitra is 

 long, slender, and spiral, the spire 

 ending in a point at the summit ; 

 the opening is small, narrow, and 

 triangular, and notched in front. 

 The inhabitant of the shell has the 

 peculiarity of projecting from its 

 mouth a sort of cylindrical trunk, 

 which is long, very extensible as 

 well as flexible, and probably pre- 

 hensile, the use of which is only the 

 subject of surmise. Mitra episco- 

 palis (Fig. 205), from the Indian 

 Ocean, is white, ornamented with 

 square spots of a fine red, and 

 capable of high polish. 



Mitra papalis (Fig. 266) has 

 dentiform folds round the opening, 



which also crown each turn of the Fig> 2 65. Mitra epis- Fig. 266. Mitr 

 spiral ; the spots are smaller, and copall: 



(Lamarck). 



