78 THE NAUTILUS. 



Long. 26, diam. 6.8, ap. diam. 5.4, whorls 11. 



Long. 21, diam. 6, ap. diam. 5, whorls 9. 



Long. 23, diam. 6.5, ap. diam. 5.2, whorls 9.5. 



On stones: Vereda del Chorreron, near Aguada, in the district of 

 Mayajigua, province of Santa Clara. 



An entire small specimen contains 16 whorls and has a length of 

 25 mm. This variety is somewhat similar to U. fallax, but internally 

 it is intermediate between U. dimidiata and U. intuscoarctata. 



UROCOPTIS (GONGYLOSTOMA) ALVEARIS, n. sp. 



Shell thin, shortly rimate, oblong, widest above the middle; spire 

 tapering to a very short truncate cone; brown, becoming purple-brown 

 on last whorl. Sculptured with narrow, oblique, whitish ribs sepa- 

 rated by spaces about four times width of ribs. Whorls 7-9, slightly 

 convex, the last very shortly free, its base defined by a very low or 

 obsolete cord. Aperture nearly circular, dull purple within; colu- 

 mella and upper portion of the peristome white. Peristome broadly 

 expanded and the upper margin reflexed. Columellar lamella promi- 

 nent. Axis with two compressed lamella?, the lower one larger, 

 broadly expanded in the last two whorls, forming a horizontal disk 

 extending one-third distance from axis to outer wall. 



Long. 20, diam. 9.2, ap. long. 6.7, ap. diam. 7.2. 



Long. 16, diam. 8, ap. long. 5, ap. diam. 5.5. 



Long. 20.8, diam. 8, ap. long. 6, ap. diam. 6.5. 



Central Cuba: La Puntilla, near Remedies, in the Santa Clara 

 province. 



Differs from dimidiata and turgida by the shorter, broader shape 

 and much more widely-spaced ribs and less expanded axial disk. 

 The two and one-half embryonic whorls are smooth and very convex, 

 as in other species of this group, with a diam. of 1.4 mm. The fol- 

 lowing four whorls are weakly and very obliquely striate, after which 

 the ribbed sculpture is assumed, irregular and rather weak at first, 

 but becoming strong and regular on the eighth whorl. The first 

 eight whorls increase in diameter very slowly, after which the shell 

 abruptly expands. 



UROCOPTIS (GONGYLOSTOMA) TUBA n. sp. 



Shell similar to U. alvearis in color, sculpture and axial plan but 

 differs from that species by its more slender contour and by the much 



