124 COKVOLUT^. 



Angyostomata, Bl. — Descr. Conical, convolute, with a short 

 spire, consisting of numerous whorls ; and narrow lengthened 

 aperture, terminating in a slight emargination at each extremity ; 

 outer lip thin ; epidermis thin ; operculum small, pointed, horny. 

 — Obs. This weU-known genus of shells is easily distinguished 

 from any other, by its conical form, its smooth columella, its 

 narrow aperture, and thin outer lip. The form of the spire 

 varies from iiat and even partially concave, to a regular pyramidal 



■ cone ; and the upper edges of the whorls are rounded in some 

 species, angulated in others, and in some are waved or coronated. 

 The variety of marking and the numerous delicate tints of these 

 shells have caused them to be highly appreciated by amateur 

 collectors ; and many species, as the C. Ammiralis, or admiral ; 

 the C. Gloria Maris, or Grlory of the Sea ; the C. CedonuUi (" I 

 yield to none"), and others, have always produced good prices 

 in the markets. "We give figures of the principal forms, as 

 expressed in the genera proposed by De Montfort, of Rhombus, 

 Hermes, EoUus and Cylinder, in figures 459 to 462. Many new 

 species were brought to this country by Mr. Cuming, and are 

 represented in parts 24, 25, 28, 29 ; 32, 33, 36, 37 ; 54, 55, 56, 

 57 ; 147, 148 ; 151 to 158 of the Conchological Illustrations, by 

 Gr. B. Sowerby, jun. See Coeonaxis, Swainson. The cones are 

 mostly tropical, some are found as far north as the Mediterranean, 

 and south as the Cape of Good Hope. The most beautiful species 

 are from the East and "West Indies. PI. xxi. fig. 459 to 462. 



CONVOLUTiE. (Enroulees, Lam.) A family of the 2nd section 

 of the order Trachelipoda, Lam. the genera of which may be 

 distinguished as follows : — ■ 



1. Ctpe^a. Lips thickened, inflected, with teeth ; spire 



hidden, including Cyprceovulum, Luponia, T?'ivia. Fig. 444 

 to 450, and Cyprsedia. PL xxvi. fig. 564. 



2. Otulum. Lips thickened, inflected, with slight crenula- 



tions ; spire hidden. Pig. 440 to 443. 



3. Erato. Lips thickened, inflected ; spire visible ; a groove 



down the back. Pig. 454. 



4. Terebjellum. Cylindrical, open at the anterior extremity ; 



