90 OLIVANCILLARIA. 



zigzag ash or olive lines, merging into reticulations ; fasciole 

 orange-brown, mottled with chestnut. Length, 1-5-2 inches. 



Ceylon; Australia f; W. Africa. 



This species has been confounded with 0. gibbosa, Born, and 

 has been supposed to be the young of that species ; the young 

 gibbosa, however, is much more inflated, and may be readily 

 separated from nebulosa of the same size ; the coloring is the 

 same in both species. 0. intricata, Marrat (fig. 84) is a 

 synonym. 



O. GIBBOSA, Born. PI. 36, figs. 85-8Y. 



Shell heavy, gibbous, the columella callous, especially the 

 upper part; spire also callously thickened ; cream-colored, body- 

 whorl with zigzags and reticulations varying from ash-gray to 

 orange and chocolate ; fasciole yellowish, maculated with brown ; 

 columella and interior of aperture whitish. 



Length, 1-5-2-5 inches. 



Ceylon; W. Africa. 



Like Olivancillaria in form, but the sutured channel remains 

 distinct on all the whorls of the spire. 



Subgenus Olivancillaria, d'Orb. 



0. BRASILIANA, Lam. PL 36, fig. 88 ; PI. 1, fig. 2. 



Fulvous fawn, streaked with white, with, short transverse gray 

 hair-lines ; spire callous, fasciole and interior of aperture orange- 

 brown. Length, 2-2-5 inches. 



Brazil, La Plata, Patagonia. 



The body-whorl has sometimes obscure brownish fasciculations 

 below the suture. 



O. DESHAYESIANA, Ducros. PL 86, figs. 89, 90. 



Shell smaller, more swollen above than 0. Brasiliana, and 

 with a proportionally heavier posterior callus. Color same as 



in 0. Brasiliana Length, 1 inch. 



Brazil. 



The form of this shell is nearly intermediate between the last 

 and the next species; it is much smaller than either, yet appears 

 to be mature. 0. ovata, Marr. (fig. 90), is synonymous. 



O. AURICULARIA, Lam. PL 36, figs. 91-^4. 



Brown or lead-color, sometimes, in the young shell with zigzag 



