84 HARPULA. 



The coloration varies greatly, as does also the degree of de- 

 velopment of the plications, causing Lamarck and others, before 

 this great variability became known, to describe different forms 

 of the species under distinct specific names. These are V. 

 thiarella, Lam; (fig. 31) ; V. Guinaica, Lam. (fig. 32 ) ; F. carneolata, 

 Lam.; F leevigata, Lam.; F. sulcata, Lam. (fig. 33); and V. 

 polypleura, Crosse (fig. 34) ; the latter being the most distinctive 

 of these varietal forms. I add a figure of the animal, with 

 operculum (fig. 38); the dentition is also illustrated (PI. 2, fig. 6). 



V. VIRESCENS, Solander. PI. 24, figs, 35, 36, 



Light chestnut or ash color, with distant white bands ; fre- 

 quently numerous punctations of dark chestnut color are 

 scattered over the surface ; outer lip with dark spots, 



Length, 2'5 inches. 



West Coast of Africa. 



V. pusio, Swainson (fig. 36), is a short form of this species, 

 the surface in a worn condition. 



Y. HEBR^EA, Linn. PI. 24, figs. 37, 40. 



Ovate, thick, pale fulvous with undulated angular vein-like 

 lines of chocolate color, and sometimes interrupted bands of the 

 same. Length, 3'5-4'5 inches. 



West Coast of Africa. Brazil (Niigely I) 



Yar. TURBINATA, Kiener. Fig. 40. 



Darker reddish brown, without the hieroglyphic markings of 

 the type-form. 



Sect. 2. Harpula, Swains. 



Shell oval-conic, spire with a papilliform but small summit ; 

 columella with larger plaits below, and additional smaller ones 

 above, but less numerous than in the preceding section ; exterior 

 lip thickened within, sharp without. 



Y. INTERPUNCTA, Martyn. PI. 24, fig. 39. 



Flesh-color with numerous revolving series of chestnut lim-ar 

 spots, and frequently, imdi-r them, two or three series of revolv- 

 ing much linger :iml paler spots, sometimes also with longitudinal 

 chestnut streaks. Length, 2-5-3-5 inches. 



Ceylon ; Indian Ocean. 



