1922] NATURAL SCIENCES OF PHILADELPHIA. 55 



The radula of L. Virata™ is figured (Plate III, fig. 5; Plate V, fig. 21 

 21), and the formula is given in Table III. The A-lateral is hood- 

 shaped, with the opening inwards; its shape is perhaps better 

 shown in the tilted A-lateral shown beneath the row of teeth of 

 Lucidella aureola (Plate III, fig: 4). This "hood" ends distad 

 with a curved hook, while there is also a stout point on the outer 

 margin. It bears no true cusps. The B-central has a cuspless 

 space on the outer tip, which fits over the C-central. The last is 

 very long and slender, and bears a small cusp on the outer margin, 

 besides the 4 terminal ones. The comb-lateral has a peculiar 

 saddle-shaped expansion of the cusp-bearing border. The accessory- 

 plate is long, but very thin and transparent; it just touches the 

 outer end of the comb-lateral. This gives the radula a peculiar 

 appearance, as the comb-lateral appears to be set off from, the inner 

 ends of the marginals by a transparent border. The entire radula 

 is so small as to require an oil-immersion lens for its thorough ex- 

 amination. Its total width is less than that of a single T-lateral of 

 Viana regina. 



Subgenus LUCIDELLA s. s. Jamaica; Haiti? Cuba? 



Lucidella Swainson (1840). Type Helix aureola Ferussac (1822). Jamaica. 

 ? Prosopis Weinland (1862). Type (monotype) P. sulcata Weinland 

 (1862). Haiti. 33 Not Prosopis Fabricius (1804). 



The radula of the type species 34 has been examined. It is figured 

 from an example that had two A-centrals (Plate III, fig. 4; Plate 

 V, fig. 22); the inner one corresponds more to the type found in 

 the other two, normal radulae. Below the row of centrals in the 

 normal position, a single inner A-central is shown in a slightly 

 tilted position, so as to give a better idea of the shape. This 

 radula differs from that of L. lirata mainly by the absence of the 

 upper point on the A-central, by the broader C-central, with 

 especially well-marked cusps, and by the greater number of cusps 

 on the comb-lateral. The marginals are more numerous than in 

 any other species of Helicinidae examined. 



Genus SCHASICHEILA Sh. Mexico; western Cuba; Bahamas? 

 Subgenus EMODA H. and A. Adams. Western Cuba. 



32 2 dried specimens; A. N. S. P. no. 72171; collected in Garden of Juarez 

 Institute, San Juan Bautista, Tabasco, Mex., by J. N. Rovirosa. 



33 This group may be valid, but its name is certainly not. 



34 3 alcoholic specimens; A. N. S. P. no. 104533; collected in Jamaica, by A. P. 

 Brown. 



