24 COCHLOSTYLA-HYPSELOSTYLA. 



This species evidently stands close to C. dactylus, and it is not 

 impossible that it should be considered a variety of that species ; 

 but the widely separated localities (Albay and the mountain valleys 

 of the eastern Cordillera, opposite Palanan), the greater number of 

 whorls, the much larger size (92 against 73 mill.), seems to me to 

 render it necessary to specifically separate this longest of all Cochlo- 

 stylas, at least temporarily, in spite of the fact that the single 

 example before me is immature. () 



C. DIANA Broderip. PI. 11, figs. 22, 23, 30, 31. 



Imperforate, elongated, turrited. Ground color pale yellow, fad- 

 ing above, the earlier two whorls pure luhite. More or less marked 

 on the body whorl with longitudinal white hydrophanous stripes. 

 Aperture, Up and columella pure ivhite. 



Alt. 47, diam. 22 ; aperture, alt. 23 mill. 



Alt. 45, diam. 25 ; aperture, alt. 25 mill. 



Alt. 35, diam. 20; aperture, alt. 18 mill. 



Island of Negros, Philippinse. 



Bulinus diana BROD., P. Z. S., 1840, p. 157. Bulimus diana 

 KEEVE, Conch. Syst. ii, t. 172, f. 2 ; Conch. Icon, t. 8, f. 40. PFR., 

 Conchyl. Cab. p. 208, t. 58, f. 8, 9 ; Monogr. ii, p. 32. 



Bulinus calista BROD., P. Z. S., 1840, p. 157. DELESSERT, 

 Kecueil, t. 39, f. 5. PFR., Monogr. ii, p. 12 ; Conchyl. Cab. p. 169, 

 t. 51, f 2. DESK, in Fer. Hist. t. 145 A, f. 1, 2. REEVE, Conch. 

 Icon. t. 8, f. 38. 



The typical C. diana is known by its light yellow color and white 

 apex and aperture. It varies much in degree of elongation, and in 

 carination, some specimens being as distinctly carinated as C. cari- 

 nata Lea. 



All manner of transition forms between calista and diana occur; 

 one is shown in pi. 11, fig. 30. This specimen is yellowish-green, 

 longitudinally clouded with white hydrophanous cuticle ; the earlier 

 two whorls are ivory white, the lip dark brown, columella encircled 

 by a purple-brown area. 



Yar. CALISTA Brod. PI. 11, figs. 24, 25. 



Two apical whorls orange-brown; lip brown-edged; columella 

 surrounded by a brown band. 



This is merely a color-phase of the C. diana, and is found in the 

 same localities. 



