HELIX. 17 



same time. H. ACULEATA, Miill. Europe. The United States 

 and West Indies also have representatives. 

 Zoogenites, Morse, 1864, is a synonym. 



Section ANGUISPIRA, Morse, 1864. 



Shell large, striate or finely ribbed, depressed- turb'mate, horn 

 color, striped or banded with brown, umbilicus moderate. H. 

 ALTERNATA, Say. United States. 



Section ENDODONTA, Albers, 1850. 



Usually depressed, with moderate or wide umbilicus, rounded 

 or carinated periphery, aperture with parietal or lip lamellae, or 

 both, surface usually costate or rugosely striate, brownish or 

 radiatingly variegated with yellowish and chestnut. H. HUA- 

 HETNENSIS, Pfr. Mostly Polynesian. 



Pity s, H. and A. Adams, 1855, is a synonym. Mr. Garrett 

 attempts to divide the species into two groups, Endodonta and 

 Pitys ; there being differences in the periphery r umbilicus, 

 number and situation of the teeth, etc. I at first endeavored to 

 make a somewhat similar arrangement of the species, corres- 

 ponding with those of the edentulate Patulae, but have not 

 succeeded ; and in grouping the species I have recurred to 

 Pfeiffer's artificial arrangement, as on the whole the most useful. 



Subsection LAOMA, Gray, 1849. 



Shell conical or trochiform, scarcely perforate, smooth, pellu- 

 cid, shining; whorls flattened, the last carinated, base plane; 

 aperture squarely depressed, lamellate, lip simple. H. LEIMONIAS, 

 Gray. New Zealand. 



Actinaria, Pfr., 1855, may be united with this, as a synonym. 



Section LIBERA, Garrett, 1881. 



Shell small, widely umbilicated, but the umbilicus (in adults) 

 strongly constricted below, so as to form a pouch-like cavity 

 within ; whorls 1-9, costulate or striate, periphery usually angu- 

 lated, rarely rounded ; peristome simple ; parietal region with 

 one or two, and the palate with two or three internal laminae, 

 columella emarginate and furnished with a spiral fold. H. FRA- 

 TERCULA, Pease. Polynesia. 



These animals are remarkable for their habit of ovipositing 

 2 



