66 Bulletin 29 230 



Shell resembling the recent West Coast C. tessellata Sowerby; 

 whorls six, the first two small, smooth, nuclear; post-nuclear 

 whorls elegantly cancellated by the intersection of equal longitu- 

 dinal riblets and revolving ridges; outer lip crenate on the mar- 

 gin, with about fourteen strong lirse within; entire inner lip over- 

 spread with a broad, margined callous plate; columella strongly 

 biplicate, the folds often grooved, callus more or less wrinkled. 

 Measurements: 14X7, 19 x10 mm. 



An exquisi te and striking shell, abundant in the blue clays. 



Localities. — • (Exp'd '16) Bluffs 2 and 3 (abundant), Cer- 

 cado de Mao; Zone G, Rio Gurabo at Los Ouemados; Zone I, 

 Rio Cana at Caimito. 



Cancellaria (JVarona) losquemadica, n. sp. 

 Plate 10, Figure 13 



Shell with seven whorls, the first two smooth, glassy, nu- 

 clear, the apical small, the second swollen; five post-nuclear 

 whorls gently convex, abruptly truncate and squarely shouldered 

 posteriorly; longitudinal ornamentation of narrow, varix-like 

 ribs (eleven on each or the last two whorls) extending from su- 

 ture to suture and intensifying the angulation of the whorls; 

 both the ribs and their interspaces are crossed by spiral threads, 

 ten on the penultimate and twenty on the ultimate whorl; aper- 

 ture sub-ovate, rounded posteriorly, produced anteriorly into a 

 short canal which is continuous with the inner lip; the latter has 

 a thin callus through which the spirals of the body are seen; 

 columella with three plications, the two anterior proximate, 

 parallel, the posterior more remote, sub-parallel, weaker; umbil- 

 icus represented by a mere chink. Length 13, width 7 mm. 



This shell has a slight resemblance to the Gatun C. decaptyx 

 Brown and Pilsbry, but is much more squarely shouldered, with 

 more numerous ribs, and a triplicate columella. 



Locality. — (Exp'd ' 16) Zone E, Rio Gurabo at Los Oue- 

 mados. 



