OBTIIALIOUS. 207 



Bulimus powisianus PETIT de la SAUSSAIE, Revue Zoologique 

 1843, p. 239 ; Guerin's Magasin de Zoologie (2), 1843, Moll., pi. 

 65. DESH. in Fer. Hist., pi. 128, f. 1, 2. REEVE, Conch. Icon. pi. 



27, f. 167 a, b, c PFR., Monogr. ii, p, 140; iii, 378. BLAND in 



C. B. Adams' Contrib. to Conch. No. 11, p. 229. BUNKER, Jahrb. 

 d. D. Malak. Ges. ix, 1882, p. 379, ph 11, f. 3, 4. Orthalicu8 

 (Corona) powisianus SHUTTLEWORTH, Notitiaa Malac. i. p. 68 

 Porphyrobaphe powisiana Petit, MOUSSON, Malak. Blatter, xxi, p. 

 13 KOBELT, Jahrb. d. D. Mai. Ges. ii. 1875, p. 223, pi. 7, f. 2. 



Very distinct in its glossy surface and light color, the flattened 

 whorls and somewhat mam mill ar apical portion. Petit's type was a 

 rather small example, length 68 mill., but others as short as 63 mill, 

 have occurred. The locality was doubtfully given as Bogota by 

 Pfeiffer, the type having been collected by Goudot ; but later infor- 

 mation locates it in the Cauca valley. 



There is wide variation in the amount and prominence of the dark 

 streaks or blotches, and they are sometimes obsolete. Reeve's figures 

 (copied in my figs. 28 and 32) show the whorls more convex than 

 the type or any specimen I have seen, and the streaks of fig. 28 are 

 far more prominent than in the typical form. 



Figures 31 and 34 are drawn from Marmato specimens received 

 from Bland. The young shell is acutely angular at the periphery. 



A specimen collected by Bland laid three dark olive-brown oval 

 eggs, about 10 mill, long, 8 wide ; the surface of the egg-shell 

 is strongly granulose. 



O. ADAMSONI (Gray). PI. 39, figs. 1,2; pi. 40, figs. 7, 8. 



Shell ovate-fusiform, thick and solid. ** Violaceous-ashy, some- 

 what olivaceous toward the base, sparsely clouded here and there 

 with brown, encircled by a conspicuous bluish-white band uhich is 

 somewhat distantly articulated with olive-black, and with a subobso- 

 lete brownish band al ove," (pi. 39, figs. 1, 2); or dull reddish on the 

 spire, obscurely streaked with darker, a median spot-band appearing 

 on the penultimate whorl, the latter part of which is pale ashen 

 above, olivaceous below the band, and copiously streaked with 

 black ; the last whorl with a wide ashen zone above, the lower three- 

 fourths olivaceous, the whole profusely streaked and spotted with 

 black ; there is a narrow peripheral black girdle bordered above by 

 a wider white one, which is frequently interrupted by black blotches; 



