ANTILLEAN OBELISCL S. 



The young of salleanus is much more broadly conic than 

 this form, which when adult has as many whorls as the larg- 

 est salleanus. 



Specimens from some places are as brightly colored as the 

 large typical form, and the whorls are occasionally a little 

 more convex than in the example figured. The largest be- 

 fore me (from the Henderson collection) measures, length 

 37, diam. 7, aperture 7.7 mm., with 111/2 whorls. 



28. 0. EANGIANUS (Pfeiffer). PL 32, fig. 23. 



Shell elongate, turrite, solid, heavy, very lightly arcuately 

 substriate, marked with distant spiral lines; straw-colored, 

 the apex white, rather obtuse, suture very lightly impressed. 

 Whorls 11, flattened, the last slightly more than one-fourth 

 the total length, rounded basally. Columella straight, cal- 

 lous, at the base of the aperture shortly and obliquely trun- 

 cate. Aperture su'b-isemioval, pearly within; peristome 

 simple, acute. Length 39, diam. 11, aperture 11.5 x 5 mm. 

 (Pfr.). 



Mexico (Lindon) . 



AcJiatina rangiana PFR., Proc. Zool. Soc., 1846, p. 115; 

 Monogr., ii, 261. REEVE, Conch. Icon., v, pi. 15, f. 65. 

 Subulina? rangiana, Pfr., MARTENS, Biologia Centr. Am., 

 Moll., p. 300. 



I agree with Professor von Martens in suspecting the local- 

 ity to be erroneous. It is likely to prove to be closely re- 

 lated to 0. salleanus, perhaps only a stout form or variety of 

 that snail. There seems to he no difference other than the 

 wider basal whorl, and consequently more ample aperture of 

 rangianus. 



Subgenus PSEUDOBALEA Shuttleworth. 



Pseudobalea SHUTTLW., Diagnosen neuer Mollusken, no. 6, 

 p. 138, in Mittheil. naturf. Ges. Bern, 1854, pp. 46, 48, for 

 Stenogyra (Pseudobalea} dominicensis = hasta Pfr. 



Shell rimate or imperforate, sinistral, slender, composed of 

 many (11 to 16) narrow, convex whorls; thin, the apical 

 whorls smooth ; aperture small, the columella concave or 



