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) ; 7. Guinaica, Lam. (fig. 32 ) ; 7. carneolata, 

 Lam.; 7. laevigatdj Lam.; 7. sulcata, Lam. (fig. 33); and 7. 

 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. PL 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. 



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

 the surface in a worn condition. 



Y. HEBR^A, Linn. PL 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 !) 



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. PL 24, fig. 39. 



Flesh-color with numerous revolving series of chestnut linear 

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

 ing much larger and paler spots, sometimes also with longitudinal 

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



Ceylon ; Indian Ocean. 



