OXYSTYLA, SOUTH AMERICAN. 145 



readily distinguished by its granulose surface, being scored by distinct 

 spiral striae cutting the growth-wrinkles into granules. 0. phlogera 

 is more allied in its smooth surface, but the black columella and de- 

 tails of coloration, the narrower mouth and more oblong last whorl, 

 probably indicate specific distinction, in view of the widely separated 

 habitats. The principal color-forms are : 



1. Uniform flesh-pink, varices light brown, parietal callus trans- 

 parent (fig. 74). 



2. Yellow below, pink above, with a peripheral girdle of purple- 

 brown spots, a narrow interrupted line above, and narrow streaks 

 below the suture (fig. 75). 



3. Brown or olive-brown, like the last or wanting the peripheral 

 girdle (figs. 76, 77). 



4. Variously and elaborately striped and streaked or blotched on a 

 yellow or whitish ground (figs. 69, 70, 71). 



Some specimens labelled " Brazil" are in the series of the Acad- 

 emy. 



Semper found the accessory gland of the penis wanting in this 

 species. 



Drouet's Bulimus zebra (Moll. terr. et d'eau douce de la Guyane 

 Francaise, p. 66, pi. 4, f. 48, 49) is evidently something of the nature 

 of 0. varia or 0. bensoni, but I cannot reconcile his figures with 

 either. Perhaps we have here to deal with another and still unde- 

 fined species. It is from around Cayenne, the forest of Rouza, and 

 Oyapoc, French Guiana. The " varite " figured does not look much 

 like the " type." 



O. PHLOGERA (Orbigny). PI. 32, figs. 67, 68. 



Shell elongated, quite thin, smooth ; spire long, perceptibly swollen, 

 the apex obtuse, black ; composed of 7 slightly convex whorls ; aper- 

 ture oval, quite wide, the lip thin, acute ; columella twisted, blackish, 

 subtruncate in the young, rounded in adults. Colors : general tint 

 whitish or purplish, paler on the last whorl ; ornamented from place 

 to place with large longitudinal brown stripes, especially on the last 

 whorl ; a wide band formed of dark purple-brown spots interrupted 

 and flamed, appears around the middle of the last whorl and the 

 upper portion of the others, bounded above and below by a blackish 

 interrupted line ; the other portion is marked with little longitudinal 

 bands, equally spaced, of a purple-brown color ; the summit is con- 

 10 



