244 SOUTH AMERICAN OBELISCUS. 



under the generic term Obeliscus belong to 'the Lamarckian 

 genu's Pyramidella. There are also some very briefly or in- 

 sufficiently described bulimi which may have been based 

 upon species of Obeliscus, the descriptions of which follow. 



Achatina sellovii King. Shell cylindric, transversely stri- 

 ate, subdiaphanous; length five-sixteenths, diam. two- 

 sixteenths inch. (King, Zool. Journal, v, p. 343.) Brazil. 

 M&y be an Opeas. 



Achatina sordida King. Shell subdiaphanous, subconic, 

 basal whorl ventricose. Length six-eighths, diam. three- 

 eighths of an inch. Rio Janeiro. (King, Zool. Journ., v, 

 p. 343.) May be an Opeas. 



Achatina strigata King. " T. diaphana, subalbida, creber- 

 rime transversim substriata, strigis longitudinialibus cas- 

 taneis raris; anfractus basalis subangulatus. Long, eleven- 

 sixteenths, lat. six-sixteenths inch." (King, Zool. Journ., v, 

 p. 343). Brazil. 



Bulimus septenarius Brag., Encycl. Meth., i, p. 324, no. 46, 

 said to be from Lima, Peru, might be an Obeliscus or Steno- 

 gyra, but is more likely a Drymtzus of the group of D. mor- 

 bidus, D. chenui, etc. (Manual, vol. xi, p. 283) ; and prob- 

 ably could be identified in a good Lima collection, if really 

 from that place. It is described as white, smooth, trans- 

 parent and turriculate, composed of 7 very slightly convex 

 whorls ; not over one inch long and four lines in diameter at 

 the base. The aperture is oval, twice as long as wide, with a 

 thin, -acute outer lip, the inner lip a little recurved in the 

 region of the axis, over the perforation. The columella is 

 straight and rounded. 



Species of Brazil and Bolivia (Subgenus Obeliscus s. str.). 



Most of the Brazilian Obelisks probably belong to the typi- 

 cal subgenus, but the embryonic shell has been examined in 

 0. obeliscus only. 



I. Shell closely striate, opaque, the diameter contained 

 to 5 times in the length; whorls 13 to 18. 



a. Adult shell 100 mm. long or more, often trun- 



