APPENDIX. 351 
general aspect; volutions few, the last one much expanded ; 
outer lip moderately thin ; inner lip moderately thickened and 
apparently without any callus; the portion of the body, exclu- 
sive of the last volution, very small and without a proper 
columella. Family relations doubtful, but they are probably 
with the Velutinide. [See p. 294, vol. ii. ] 
TURRITELLA, Lam. [p. 224]. 
SMITHIA, Maltzan, 1883. Like Hglisia, but the whorls not in 
contact, with revolving strie; peristome simple. Operculum 
corneous, multispiral. S. gracilis, Maltzan. Isl. Gorée. 
Littorinide [p. 240]. 
Ipuitus, Jeffreys, 1883. 
EHtym.—One of the Argonauts. 
Type.—l. tuberatus, Jeffreys. Europe. 
Shell conical, covered with spiral rows of tubercles; the apex 
consists of a cylindrical process of several whorls, which is 
closely striated lengthwise; operculum horny, paucispiral with 
a lateral nucleus. 
The peculiar apex may be compared to the styliform process 
of Ianthina and Stylifer,and there are several other genera, such 
as Cecum and Turritella, in which the embryonic spire, which 
had become useless for the occupancy of the mollusk, is decol- 
lated or plugged up. 
Rissoa, Frem. [p. 264 ]. 
HEMISTOMIA, Crosse. Mr. E. Marie, who collected this mollusk 
in New Caledonia, writes to me that it is fluviatile; it should 
therefore be removed to the subfamily Hydrobiine. 
DipLoMMATINA, Benson [p. 282]. 
One species occurs in the island of Trinidad, West Indies. 
Helicinidz ‘p. 290]. 
The dentition (which is really rhipidoglossate) is erroneously 
described from H.and A. Adams’ “ Genera.” The figure referred 
to, however, correctly represents it. The family has been 
usually included under the old order Scutibranchiata 
OrpdER SCUTIBRANCHIATA [p. 293]. 
This order (and its suborders) may be suppressed. See p. 348. 
VeELATES, Montf. [p. 298]. 
VELATELLA (Meek, 1872), White, 1883. Shell resembling both 
Dostia and Velates, suboval, flattened beneath, depressed-convex 
