196 AMERICAN OPEAS. 



the adult of lucida, giving a new description and figures. 

 Specimens received from Poey as lucida are undoubtedly 

 micra. 



Achatina lucida POEY, Memorias sobra la Historia Natural 

 de la isla de Cuba, i, pp. 207, 212, pi. 12, f . 30, 31.Stenogyra 

 I, POEY, t. c. p. 396. GUNDLACH, Malak. Bl. iv, 1857, p. 44. 

 Bulimus lucidus Poey, PFR., Novit. Conch, p. 430, pi. 96, 

 f. 36-38 (Havana) ; Monogr. iv, 459; vi, 98. 



Var. margaritaceum ( Shuttleworth) . PI. 28, fig. 62. 



Shell narrowly perforate, turrite, sharply and remotely 

 striate, with a pearly luster, diaphanous, waxen. Spire ob- 

 tuse; whorls 6, a trifle convex (vix convexiusculi) , the last 

 about two-sevenths the total length ; suture deep ; columella 

 rather straight. Aperture ovate-oblong, the right margin 

 of the peristome somewhat flexuous, columellar margin re- 

 flexed. Length 5, diam. scarcely 2, aperture about 1.25 x .75 

 mm. (Shuttl.). 



Porto Rico : Rio Blanco in the Sierra de Luquillo. (Blauner) . 



Stenogyra (Opeas) margaritacea SHUTTL., Diagn-osen 

 neuer Mollusken no. 6, p. 139, extracted from Mittheil. natur- 

 forsch. Ges. in Bern, 1854, p. 47. Bulimus margaritaceus 

 Sh., PFR., Monogr. iv, p. 460. 



I figure a specimen from Rio Blanco, determined by Thomas 

 Bland. It agrees perfectly with Shuttleworth ? s diagnosis in 

 size, but has a larger aperture, nearly 2 mm. long, and the 

 whorls are moderately convex. 



Var. tryonianum (Tate). PL 28, fig. 63. 



" Shell conically subulate, semipellucid, not umbilicated, 

 whorls seven in number, rather flattened, shouldered at the 

 suture, ornamented with numerous nearly straight longi- 

 tudinal costae, interstitial spaces smooth; suture somewhat 

 impressed; columella a little thickened; aperture elliptical-; 

 outer lip straight and simple. Total length of shell .22 inch ; 

 breadth 0.075 inch ; height of last whorl 0.075 inch. " (Tate) . 



"In the forest on an island in the lagoon of Boco del Toro, 

 on the borders of Panama and Costa Rica." (Tate). 



Bulimus tryonianus TATE, Amer. Journ. of Conch, v, p. 157, 



