APPENDIX, VOL. XXTV: GASTROCOPTA. 



229 



immersed upper palatal. Lower palatal fold is very long, 

 somewhat immersed, oblique and indistinctly binodose in 

 front, its upper end continued inward as a slender ridge, then 



Figs, i, 2. Gastrocopta colombiana, enlarged aperture and front view of 

 type. 



Fig. 3. Columella and parietal wall seen from below, the peristome above, 

 showing: c, columellar lamella; p, parietal, and a, angular lamellae. 



Fig. 4. Inside of the palatal wall, the peristome on the right, s, supra- 

 palatal fold ; u, upper palatal ; /, lower palatal, and b, basal fold. 



enlarging into a high, stout fold. The basal fold is transverse, 

 weakly bilobed. 



Length 2, diameter 0.9 mm. 



Colombia: Puerto Columbia, dept. Atlantico, on limestone 

 hills. Morgan Hebard and J. A. G. Rehn, 1920. Type and 

 paratypes no. 46634 A. N. S. P. 



Gastrocopta colombiana PILS., Proc. A. N. S. Phila., 1920, 

 p. 329, figs. 1-4. 



While this species of the subgenus Immersidens is somewhat 

 similar to G. cochisensis, G. d-alliana and other North Amer- 

 ican snails of the same subgenus, it differs remarkably in the 

 palatal folds, the upper being doubled, probably by division 

 of a primitively single upper palatal, and the lower fold enters 

 so deeply that its full structure can be understood only by 

 breaking out the palatal wall, as in fig. 4. 



GASTROCOPTA KLUNZINGERI (Jickeli). Vol. XXIV, p. 120. 



The original description of Ennea imulsa Preston follows. 



" Shell elongately ovate, very minute, cream-colored; 

 whorls 4%, very convex, sculptured with oblique, transverse 

 riblets, the last ascending in front; suture deeply impressed; 



