259 



thickened, columellar margin reflected. Operculum corneous, 

 paucispiral, the nucleus near the inner lip. 



Animal with subulate tentacles, approaching at the base, e}^es 

 large, nearly sessile, foot truncated in front, mentum bilobed, 

 opercular lobe winged on each side, branchial plume single. 



Over fifty species have been described, from tropical and 

 temperate seas. The genus appeared earty in the secondary and 

 became abundant in forms during the Tertiary period. 



The foot of Eulima secretes a mucous filament which assists 

 to sustain it in the water. The parasitism of several species has 

 been observed. E. distorta lives in the interior of Holothuria 

 intestinalis upon the coast of Norway; several species have 

 been captured in the intestines of Holothurians at the Philippine 

 Islands, and one of them insinuates itself so deepty in the integu- 

 ments of the Holothuria that only the summit of its spire remains 

 exposed ; at New Caledonia they have been observed attached 

 to Asterise. 



The synonyms are Pasithea, Lea (in part), 1833, and Balds, 

 Leach, 1847. Monterosato has proposed two sections Vitreolina 

 and Acicularia, for some of the Mediterranean species. The 

 first contains the small vitreous species without internal varices, 

 with curved spire and slightly obtuse apex ; the second has the 

 apex acute, the shell white, the internal varices occasional. 



Subgenus SUBULARIA, Monterosato, 1884. 



Shell subulately turriculated ; whorls a little flattened on the 

 side, smooth, polished, often ornamented with spiral colored 

 bands, a succession of slight varices on each side of the spire, 

 not always apparent ; aperture oblong, narrow, entire ; inner lip 

 thickened, a little sinuous in the middle, outer lip sharp, flexuous. 



I reluctant!}' use the above name in preference to the better 

 known one of Leiostraca, H. and A. Adams, 1853, on account of 

 Liostracus, Albers, 1850. 



Section HALIELLA, Monterosato, 1878. Animal blind. 



Subgenus BACULA, H. and A. Adams, 1863. 

 Differs from Eulima in having spiral striae, and the columella 

 twisted back so as to form an acute angle at the base of the 

 aperture. Arcuella, Nevill, 1874, is a synonym. 



