13 



of the whorls where it is slightly striated, the lip is not much 

 thickened, and the spire is more elevated than in H. fulva, which 

 in other respects it resembles. Bolivia, South America. 



64. H. OREsiGENA. (pi. i, f. 28.) D'Orb. Moll. Am. Mer. 

 p. 399. 



T. H. fulvae simillima, sed labio externo vix expanse ; sub- 

 reflexo, columella angustiori. 



The outer lip and columella of this species are narrower than in 

 H. fulva, and the shell is rather more depressed. Bolivia. 



Sect. 9th. Shell horny ; columella rather angulated, or slightly 

 notched ; otUer lip scarcely thickened. 



65. H. ORBicuLATA. (pi. i. f. 33,34.) Oligyra orbiculata, Say. 

 Zool. Journ. i. 70. 



T. parva, globosa, depressa, concentrice tenuissime striata; labia 

 interno sub-calloso ; columella obliqua, sub-angulata ; labio externo 

 tenui, sub-reflexo. 



Small, globose, depressed, concentrically and very finely striated; 

 inner lip rather callous ; columella oblique, rather angulated ; outer 

 lip thin, a little reflected. North America. 



66. H. CORNEA, (pi. i. f.35, 36.) 



T. H. orbiculatae simillima, sed crassiori; labio externo ad basin 

 columellas sub-emarginato ; columella callosa. 



Thicker and darker than H. orbiculata, rather less depressed 

 with the columella and the lower part of the inner lip callous, and 

 the outer lip very slightly notched behind the columella. 



67. H. CASTANEA. (pi. i. f. 31, 32.) Guilding } 



T* H. orbiculatae simili, sed laevi, depressa; labio externo 

 tenui. 



Like H. orbiculata, but smooth and depressed ; outer lip thin. 



North America. 



68. H. NiTiDA. (pi iii. f. 116. J Pfeiffer. Wiegmann Archiv fiir 

 Naturgesch. Band i. 1839. 



" T. sub-depressa, tenui, glabra, saturate incarnata, supra subtus- 

 que convexiuscula, apice mucronato, anfractibus 5, ad suturam 

 minutissime striatis ; columella vix callosa; labio simplici, acuto, 

 sinuato, ad angulum columellarem acute dentate" 



Differing from H. castanea in having a sinuosity in the upper 

 part of the outer lip, which is slightly thickened. Matanzas. 



69. H. rotunda, (pi. iii. f. 111.) D'Orb. Moll. deCub. p. 292. 

 T. globosa, conica, nitida, tenui ; labio externo tenui, supeme 



sinuato, depress©. 



Globose, conical, shining, thin ; outer lip thin, the upper parts 

 sinuated and slightly depressed. Cuba, 



70. H. MiNUTA. (pi. i. f. 40, 41.) nobis. Zool. Proc. 1842. 



T. parva, depressa, sub-angulata, rubra vel straminea; marginc 

 crasso, effuso; labio interno calloso ; columella ad basin sub- 

 emarginata. 



