56 



VARICELLA. 



the right margin impressed outside, spreading, columellar 

 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 (PiLsbry). Varieties in St. 

 Thomas and South Florida. 



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

 1839, p. 352. Bulimus g., PFR. Symbolse iii, p. 54; Monogr. 

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

 pi. 80, f. 594. Melaniella g., ARANGO, Fauna Malac. Cubana 

 p. 88. 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 l / 2 

 whorls in the subcylindric embryonic shell, the first half 

 whorl smooth, next whorl rather coarsely costulate, 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. 



