512 Mr. H. B. Preston on new 



painted with interrupted bands and transverse zigzag flame- 

 markings of ricli chocolate; whorls 5i, sculptured with tine 

 reo-ular spiral strise and marked with fine indistinct lines of 

 growth; sutures well impressed; columella arched, reflexed 

 over the narrow umbilicus ; peristome acute, somewliat 

 broadly reflexed ; aperture oval. 



Alt. 24, diara. maj. 13 mm. 



Aperture : alt. 11, diam. 6 mm. 



Hah. British Guiana. 



Orthalicus powusianus, Petit, var. niveus, nov. 



Shell pure white, bearing only a very faint trace of the 

 infra-peripheral band ; lower portion of the columellar callus 

 slightly stained with very pale brown ; outer lip and interior 

 of sliell pure white. 



Taken with the animal alive by Mr. Mervyn G. Palmer at 

 Jimenez, Rio Dagua, West Colombia. 



Planorlis pucaraensis, sp. n. (Fig. 15.) 



Shell suborbicular, very depressed above, basally somewhat 

 convex, blackish brown ; spire slightly concave ; whorls 3, 

 rapidly increasing in size, sculptured with strong, transverse, 

 arcuate lines of growth; sutures impressed; umbilicus mode- 

 rately wide above, narrow and deep below ; columella oblique, 

 extending into a thin callus above ; peristome simple, acute ; 

 aperture broadly sublunate. 



Alt. 2*5, diam. maj. 6-75, diam. min. 5o mm. 



Aperture : alt. 2, diam. 2 mm. 



Hah. Pucara, Peru, at an altitude of 12,500 feet. 



Nassa jlammulata, sp. n. (Fig. 13.) 



Shell fusiform, moderately solid, pale yellowish painted 

 •with transverse streaks of reddish brown, which appear as 

 flame-markings on the upper whorls; whorls 6, the first five 

 spirally grooved, the grooves being more noticeable above ; 

 the last whorl transversely ribbed, the ribs being formed into 

 rows of tubercles by the spiral grooving, wiiich is more 

 uniform on this whorl; sutures well impressed; columella 

 slightly excavated and extending into a callus, wbicli joins 

 the lip above ; peristome simple, but not acute; canal short 

 and wide ; aperture inversely auriform. 



Alt. 1 3*25, diam. maj. 7 mm. 



Aperture : alt. 5, diam. 2'5 mm. 



Hah. S. Peru. 



