SOUTH AMERICAN OBELISCUS. 245 



cate at the tip, finely and densely striate. 



0. obeliscus, no. 1. 



aa. Shell 72 x 14 or 15 mm., with 15 to 18 whorls. 



0. carphodes, no. 2. 

 aaa. Shell 84 x 17 mm. with 13 flattened whorls. 



0. planospirus, no. 3. 



II. She'll wrinkled below the suture, elsewhere smoother, 

 the cliani. contained 3y 2 *o 4 times in length; whorla 

 10-12. 



a. Summit large, the diam. at second whorl 2.8 

 mm. ; 28 x 8 mm., with 8 whorls. 



0. pattalus, no. 6. 



aa. Summit smaller, 2 mm. diam. ; whorls 11 to 12. 



&. 34 x 9 mm., aperture contained four times 



in length of shell. 0. agassizi, no. 5. 



6&. 31 x 7 mm. ; spire more slender, aperture 



smaller, 4 1 / times in length. 



0. sylvaticus, no. 4. 



III. Shell smooth, thin and pale, 14 x 4 mm. with 9 whorls. 



0. bacterionides, no. 7. 



IV. Shell smooth, thin and w r hitish, very slender, 22 x 3 mm., 

 with 14 flattened whorls. 0. subuliformis, no. 8. 



1. 0. OBELISCUS (Moricand). PI. 34, figs. 44 to 48, 51. 



"Shell elongate, terebriforni, whorls 15. very finely striate, 

 ashy-buff, lip simple. Length 85, diam. 17 mm." (Mori- 

 cand) . 



Brazil: Caravelhas (Moric.) ; Bahia (Paz), Taguara, Prov. 

 Rio Grande do Sul ( v. Ihering) . 



Helix (Cochlicella) obeliscus MORIC., Mem. de la Societe 

 de Phys. et d'His't. Nat, de Geneve, vi, 1833, p. 540, pi. 1, f. 

 4; vii, p. 424 (eggs and young). Bulimus o., REEVE, Conch. 

 Icon., v, pi. 52, f. 343. DESK, in Fer., Hist., ii, p. 113, pi. 

 142 A, f. 3, 4. PFR., Monogr., iii, p. 395; Conchyl. Cab., p. 

 107, pi. 34, f. 1. HIDALGO, J. de Conch., 1870, p. 55.Sten. 

 (O'beliscus} O'beliscus Mor., Clessin, Malak. Bl. n. F., x, p. 

 169. 



Moricand described an immature specimen of the narrow 



