STxtEPTOSTYLA. 101 



Venezuela (Cuming coll.) . 



Spiraxis subcallosa PER., P. Z. S. 1855, p. 99 ; Monogr., iv, 

 p. 577. 



This species has not been figured. The locality needs con- 

 firmation, no other species of the genus being known to occur 

 in South America. 



Subgenus STREPTOSTYLELLA Pilsbry, n. s.-g. 

 Shell small, slender, with lengthened spire and small aper- 

 ture, the first iy 2 whorls nearly smooth, the rest closely cos- 

 tulate, the later whorls angular above ; columella Streptosty- 

 loid. Type S. botteriana. 



47. S. BOTTERIANA C. & F. Vol. I, p. 44. 



Subgenus PETENIELLA Pilsbry, n. n. 



Petenia CROSSE et FISCHER, Diagnoses Molluscorum no- 

 vorum Guatemala et Reipublicas Mexicanae, Journ. de Con- 

 chyl. 1869, p. 35 (p. 7 of separate copies issued Nov. 1, 1868), 

 sole species P. ligulata; Miss. Scient. au Mex., Moll., i, p. 66. 

 Not Petenia Gunther, in Pisces, 1862. 



The shell is like Chersomitra except in having a dark band 

 at the periphery. According to Morelet, the tail is abruptly 

 truncated at the end, and has a mucous pore. This structure 

 needs further investigation, since a caudal pore elsewhere 

 occurs only in Aulacopod pulmonates. 



48. S. LIGULATA (Morelet). Vol. I, p. 50. 



49. S. CATENATA (Pfr.). Vol. I, p. 251. 



Subgenus VARICOTURRIS Pilsbry, n. s.-g. 

 The shell is small, oblong-turrite, with a long spire com- 

 posed of narrow, convex whorls, the aperture short and diag- 

 onal ; embryonic whorls apparently smooth, the rest vertically 

 ribbed, with occasional dark streaks; columella excised at 

 base, not much twisted. Type S. dubia Pfr. 



50. S. DUBIA (Pfeiffer). PI. 28, fig. 65. 



Shell turrite-oblong, rather solid, provided with close, 



