110 HELIX. 



whorls 4, somewhat rapidly increasing, flattened above, convex 

 below, the last obsoletely angulated, not depressed. Diam. 13 mill. 



Richmond River, Australia. 

 Similar to juvenile specimens of H. Franklandiensis. 



H. KAMSAYI, Cox. PL 3, figs. 19, 20. 



Widely umbilicated, subdiscoidal, rugosely striate, under a 

 smooth olivaceous epidermis ; whorls 4 -5, rapidly increasing, the 

 last rounded on the periphery, a little deflected in front ; aperture 

 large, horizontal, bluish white. Diam. 32*5 mill. 



Richmond River, Australia. 



Section GLYPTOSTOMA, Bland and Binney, 1873. 



H. NEWBERRYANA, W. G. Binney. PI. 21, figs. 6, 7. 



Moderately umbilicated, solid, lightly granularly decussated by 

 incremental and spiral striae, whitish, under a blackish or reddish 

 brown epidermis; whorls 6, a little convex, regularly increasing, 

 the last subdepressly rounded, scarcely descending in front ; aper- 

 ture pearly white, lip subcallous within. Diam. 35 mill. 



California. 



Group V. ANCHISTOMA (Klein.), H. and A. Adams, 1855. 



Shell depressed, corneous, with aperture usually dentate or 

 plicate, lip contracted and reflected, usually widely or moderately 

 umbilicated, sometimes imperforate. Jaw odontognathous (oxy- 

 gnathus in Ophiogyra). 



Mostly American and European ; Ophiogyra is Asiatic. 



Section I. GONOSTOMA, Held, 1837. 



Shell umbilicated, orbicularly depressed, narrow- whorled, often 

 hirsute ; whorls 5-7, slowly increasing ; aperture oblique, narrowly 

 lunar, more or less insinuated or tooth-like within, the peristome 

 reflected and labiate, parietal wall unarmed. 



European. 

 Subsection I. DREPANOSTOMA, Porro, 1836. 



Nautiliform, last whorl largely enveloping; aperture vertical, 

 falciform, peristome callous. H. NAUTILIFORMIS, Porro. 



So. Europe. 

 Ammonitella, Cooper, 1868, is a synonym. 



Subsection II. TRIGONOSTOMA, Fitzinger, 1833. 



Shell depressed or plane above, periphery rounded, axis umbili- 



