8o 



Bulletin 39 



upper half of the body-v\^horl is smooth but below, the whorl car- 

 ries about 16, low, faint, spiral ribbons like those of Malea but 

 much less strong; these spiral ribbons average about 1.25 mm in 

 width; the growth lines cross the face of the whorl from the tip 

 of the canal to the shoulder angle in a slightly convex curve, the 

 convex side of which is towards the aperture; from the shoulder 

 angle to the suture the growth lines are reversed with the con- 

 cave side facing the aperture; aperture broadly elliptical; the ca- 

 nal was probabl}^ short and turned inward or ventrally. 

 Height 66, diameter 39 mm. 



This truly remarkable species evidentl}^ belongs to the Pleu- 

 rotomoid genus Halia, of which the 4 known species are Euro- 

 pean and North African in their distribution. Its type species 

 Halia Pria^nus Meuschen is living off the coast of Spain and 

 North West Africa. According to Cossmann, there are three 

 Tertiary species in Europe, H. prcecedens Pant, from the Helve- 

 tian of Italy, H. Desliayescana da Costa in the Tortonian of 

 Portugal and Italy, and H. helicoides Br. in the Plaisancian of 

 the maritime Alps. 



The European species are described as being entirely smooth, 

 but the Gatun shell is sculptured on its lower half with ribbon- 

 like spirals bands. 



Gatun Stage: Mt. Hope, C. Z. 



Genus CANCELLARIA Lamarck 

 Cancellaria darlena Toula Plate 6, figure 8 



Cancellaria dariena Toula, 1909, Jahrb. K-K. Geol. Reichsanstalt, 

 Wien, vol. 58, p. 31, pi. 25, fig. 13, pi. 28, fig, 2. 



Cencellaria dariena Brown and Pilsbry, 191 1, Proc. Acad. Nat. Sci. 

 Phila., vol. 63, p. 345, pi. 24, figs. 3, 4. 



Cancellaria darienesis Cossmann, 1913, Jour, de Conchyliologie, vol. 

 61, p. 51, pi. 4 figs. 9, 10. 

 var. trachyostraca Brov\?n and I'ilsbr}-. 



Cancellaria dariena, var. Toula, 1909, Jahrb, der K-K, Geol, Reich- 

 sanstalt Wien, vol. 58, p. 37, pi. 28, fig. 11. 



