56 VARICELLA. 



the right margin impressed outside, spreading, oolumellar 

 margin shortly reflexed, appressed. Length 7, diam. 1.75, 

 aperture 2x1 mm. (Pfr.). 



Western Cuba: Carmelo, near Havana (Rhoads) ; Lagu- 

 nillas district of San Juan y Martinez, Prov. Pinar del Rio 

 (Wright) ; Managua (Poey) ; Matanzas and near Sancti 

 Spiritus, Santa Clara province (Pils-bry). Varieties in St. 

 Thomas and South Florida. 



Achatina gracillima PFR., in Wiegmann's Archiv f. Naturg. 

 1839, p. 352. Bidimus g., PFR. Symbols iii, p. 54; Monogr. 

 ii, 160; iii, 394; iv, 465; vi, 105. REEVE, Conch. Icon, v, 

 pi. 80, f. 594. Mela/niello, g., ARANGO, Fauna Malac. Cubana 

 p. 8S.^-~Bulimus striaticostatus ORB., Hist. Fis., Polit. y Nat. 

 de la Isla de Cuba, Moluscos, p. 93, pi. 11 Us, f. 19-21 

 (1845) ; and French edition i, p. 176 (B. striaticostata) . 



Pfeiffer's specimens were collected either in Havana or 

 Matanzas provinces, but he does not give the exact place. 

 I have taken Matanzas to be the type locality, since Pfeiffer 

 collected extensively there. Specimens are before me from 

 all the places mentioned above except Managua. 



A Matanzas shell (pi. 14, fig. 26) measures, length 6, 

 diam. 1.6, aperture 1.7 mm., with 7% whorls. There are 2^/2 

 whorls in the subcylindric embryonic shell, the first half 

 whorl smooth, next whorl rather coarsely cositulate, the fol- 

 lowing embryonic whorls more closely and finely costulate, 

 the intervals smooth. This sculpture is rather abruptly re- 

 placed by the spaced ribs and striate intervals of the neanic 

 stage. The last whorl has about 20 (19 to 22) narrow ribs, 

 each interval sculptured with 4 or 5 striae. I see no trace 

 of spiral striation. There are also several sdnuous varices 

 on the later whorls, at intervals of -a half-whorl or more. 

 The aperture is quite oblique, piriform; outer lip bent in 

 and produced forward at its upper third. Columella very 

 indistinctly subtruncate at base, broadly concave above, con- 

 tinued as a curved callous ridge on the parietal callus. 

 Parietal callus appressed, but with a distinct thread-like or 

 thickened edge connecting the lip-ends. In a basal view the 

 axis is seen to revolve around a central well or " false um- 

 bilicus " as shown in pi. 14, fig. 32. 



