GASTEROPODA. 
Shell turreted, umbilicated or rimose; aperture more or less 
circular ; peristome continuous ; margin straight, acute. 
The species have the habit of agglutinating grains of sand to 
the surface of the shell. 
Distribution, 4 species. Japan, Philippines, 2—70 fathoms. 
Fossil, 1 species. Oligocene, Latdorf. 
MicrostTeLMA, A. Adams, 1863. 
Type, M. Deedala, Adams. Japan, 48 fathoms. 
Shell turreted, ovate, rimose, somewhat resembling Pyrami- 
della ; spire conical; whorls longitudinally plicated. Aperture 
oblong, produced in front, sub-canaliculate; columella thick- 
ened, straightish ; lip simple. 
Fossil, 1 species. Sub-apennine formation. Asti, Italy. 
BARLEEIA, Clark, 
Named in honour of the late G. Barlee. 
Type, Turbo ruber, Montagu. Britain, Mediterranean. 
Animal and shell related to Rissoa ; mantle and opercular lobe 
destitute of filaments; operculum solid, auriform, and gibbous, 
nucleus excentric. 
Distribution, 3 species. Atlantic and Pacific Oceans. 
[FAMILY SKENEIDA] 
Includes Skenea (p. 256), and 
HomAwoGyra, Jeffreys, 1867. 
Synonyms, Omalogyra, Jeffreys; Spira, Brown; Ammoni- 
cerina, Costa, 1861. 
Etymology, a flat circle. 
Tyne, H. atomus, Philippi (Skenea nitidissima, F'. and H.). 
Animal with a flattened body, no tentacles; eyes sessile, and 
placed behind the head. 
Shell minute, forming a flat coil; spire involute; whorls 
more or less angulated ; mouth clasping both sides of the peri- 
phery ; operculum few-whorled, with a central nucleus. 
The upper part of the body of H. atomus is partially ciliated. 
The tongue has only a single row of teeth, resembling miniature 
shark’s teeth. 
Distribution, 2 species. In pools, and just beyond low water, 
on sea-weeds and Zostera. Norway, Britain, France, shores of 
the Mediterranean. 
Fossil, upper tertiary deposits. 
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