CER1ON, GROUP II. 191 



across Little Cayman, hardly a half mile from the northern shore. 

 22 specimens found. 



Form nitela Maynard (PI. 27, figs. 22, 23). Shell strong, de- 

 cidedly smaller and more slender than typical levigatum, blue-stained 

 white. Smooth or nearly so, except at the base, which is sometimes 

 rather sharply but delicately ribbed. Post-nepionic whorl sometimes 

 hardly costulate. Length 27.5, diam. 12.5 (type). Varies from 28 

 to hardly 25 mill. long. Slightly stouter and less tapering above 

 than form acutum, but there is perfect intergradation between them ; 

 this form in fact connecting typical levigatum with acutum. 



This form occurred in numbers in exposed situations in patches of 

 Guinea grass growing on the margins of the path that crosses the 

 west end of Little Cayman. They were clinging to the grass stems, 

 at the roots of which lay hundreds of dead specimens. They ap- 

 peared to be restricted to two or three of these small clearings. 



Form acutum Maynard. (PI. 27, fig. 24.) Somewhat smaller 

 and more slender than form nitela, and nearly smooth, though a few 

 irregular riblets usually appear on the latter part of the last whorl. 

 Blue-stained white, often indistinctly mottled with flesh-color on the 

 cone, sometimes having worn patches of livid brown. Spire slowly 

 tapering, acute, the conic portion long, including all but the last or 

 last two whorls. Length 23.5, diam. 9.5-10 mill, (type); varies 

 from 24.2 to 20 mill. long. 



This form was found by Mr. Maynard in numbers on bushes grow- 

 ing on the south side of a little open patch of ground, on the western 

 path across Little Cayman, near its junction with the other path a 

 few hundred yards from the south shore. The entire space occupied 

 by the shells did not exceed a quarter of an acre in extent, and the 

 form was not found elsewhere. It is, however, the slightest modifi- 

 cation of form nitela. 



Form pictum Maynard. (PI. 27, figs. 25, 26.) Similar to forms 

 nitela and acutum, but copiously variegated with dull purple or 

 purple-brown; peristome less thickened, nearly smooth, except for 

 sharp riblets at the base and sometimes behind the outer lip. Length 

 of types 24x10 and 21.5x9.7 mill. Varies from 26 to 21 mill. long. 

 This is a variegated form of the nitela-acutum type, as form festivum 

 is of typical levigatum. It occurred around open spots in the Guinea 

 grass, near the southern end of the western path across Little 

 Cayman. 



