204 ZONITES. 



II. MAZATLANICA, Pfr. PL 61, fig. 69. 



Widely umbilicated, depressed, closety costulatQ r &triate, cor- 

 neous ; whorls 4, somewhat convex, moderately incurving, the 

 last narrow. Diam. 2'3 mill. 



Mazatlan, W. Coast of Mexico. 

 H. ELEGANTULA, Pfr. PI. 61, figs. 70-72. 



Widely umbilicated, depressed, almost discoidal, thin, closely 

 elegantly costulate, hyaline white ; whorls 4, somewhat convex, 

 the last scarcely wider than the penultimate, periphery rounded, 

 suture deep. Diam. 1*5 mill. 



Near Vera Cruz, Mexico. 

 H. EXULATA, Smith. PL 61, figs. 73-75. 



Widely deeply umbilicated, thin, semitransparent, pale yel- 

 lowish horn-color, glossy, with oblique growth-lines ; whorls 5, 

 rapidly enlarging, suture margined. Diam. 7*5 mill. 



Tristan d'Acunha. 



A doubtful member of the group, its geographical position 

 and size being objections ; on the other hand, the rugose, almost 

 rib-like striae and large umbilicus are points of agreement. 



H. INCRUSTATA, Poey. PL 61, figs. 76-78. 



Rather largely umbilicated, somewhat thin, closely striate, 

 horn-colored, usually incrusted with particles of earth ; whorls 

 4, convex, the last obsolete!}' angulated above the middle, 

 suture deep. Diam. 4*66 mill. 



Florida, Texas, Cuba. 



H. saxicola, Gould, is a synonym. 



Section PYCNOGYRA, Strebel, 1880. 

 H. BERENDTI, Pfr. PL 61, figs. 79-81. 



Umbilicus rather large, shell somewhat solid, hyaline white, 

 closely costulate above ; whorls 6, a little convex, very slowly 

 increasing, the periphery subangulate, base more convex, smooth- 

 ish. Diam. 4 mill. 



Vera Cruz, Mexico. 



Subgenus JANULUS, Lowe, 1852. 

 H. POMPYLIA, Shuttle worth. PL 61, figs. 82-84. 



Perforate, flattened and costulate above, convex below and 

 smoothish ; reddish corneous, streaked radiately with white on 



