54 PROCEEDINGS OF THE ACADEMY OF [Voi. LXXIV 



A number of minute, globose shells (L. venezuelensis n. sp.), 

 which were collected rear Palma Sola, Estado Falcon, Venezuela 

 (1920), closely resemble this Jamaican group, which originally 

 was described as a genus of " Stoastomidae. " The margin of the 

 aperture is entire, but quite simple, and the shell is well-perforated. 

 The sculpture consists of well-marked spiral ridglets. The calcare- 

 ous plate of the operculum is rather heavy, and is quite markedly 

 concave externally. 



On examination of the radula (1 dried specimen), I was greatly 

 surprised to find it very close to that of Lucidella lirata (Plate III, 

 fig. 5; Plate V, fig. 21), and totally unlike that of Stoastoma (Plate 

 VI, fig. 26). It differs from that of L. lirata in the presence of 

 several cusps on the upper margin of the hood-shaped A-central, 

 in the lanceolate C-central without the accessory lateral cusp, 

 and in the larger number of cusps (like L. aureola) on the comb- 

 lateral. It is the smallest Helicinid radula that I have examined. 



On account of the very similar shell-characters, it is placed 

 tentatively in the subgenus Lindsleya, which is transferred to the 

 genus Lucidella. If the shell-characters are any key to their re- 

 lationship, I suspect that all of the species of this group and part 

 of those in Metcalfeia belong here, as they do not possess the lip 

 expansion and upper sinus, characteristic of true Stoastoma. This 

 would restrict the latter genus to Jamaica, as S. haitianum Weinland 

 and S. domingensis Vanatta from Haiti, and S. portoricense Pfr. 

 from Porto Rico, lack these typical shell characters of Stoastoma 

 pisum C. B. Adams (1849). The whole Stoastoma-problem needs 

 reinvestigation, as practically none of the species have been figured, 

 and many are impossible to identify from the descriptions. 



The radula and the shell of L. venezuelensis n. sp. will be more 

 completely described and figured in a future paper. The radular 

 formula is given in Table III. 



Subgenus POENIA H. and A. Adams. Tropical America. 



Poenia H. and A. Adams (1856). Type (Fischer) H. unidentata Pfr. 



(1849). Guatemala. 

 Perenna Guppy (1867). Type H. (Perenna) lamellosa Guppy (1867). 

 Isle Trinidad. 

 L. lirata (Pfr.). (1847). Yucatan. (Mexico to Venezuela). 

 //. unt'dcntalii Pfr. (1N49). Honduras. 

 //. rusticetta Morelet (1849). Carmen Island, Yucatan. 

 ? //. semialriata Sowerby (1866). Boca del Toro, Chiriqui, Panama 

 (v. Mart. 1890). 

 L. pilsbryi Clapp (1914). Swan Island, Bay of Honduras. 

 L. tantilla (Pilsbry) (1902). Florida, U. S. (Cuba, Ramsden). 



