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5. Monocrapru or Piecotrema, A New Genus or GASTERO- 
popous Mou.usks, BELONGING TO THE Famity AuRICcU- 
LIDZ, FROM SPECIMENS IN THE CoLLEecTION oF HvuGu 
Cumine, Esa. By H. ann A. Apams. 
Genus Piecotrema, H. & A. Adams. 
Testa ovato-conica, umbilicata, transversim sulcata; spira elata, 
acuta; apertura angusta; labio triplicato, plica mediana bi- 
partita ; labro extus incrassato, intus bidentato. 
Shell ovate-conic, solid, umbilicated ; spire elevated, acute; aper- 
ture contracted, oblong ; inner lip with three plaits, the middle one 
bifid; outer lip with a marginal varix, internally bidentate. 
A genus of small shells allied to Cassidula. 
1. Puecorrema typica, H. & A. Adams. PP. testa ovato- 
conica late et profunde umbilicata, pallide ferruginea, fulvo 
cincta ; spira conica, elata, transversim valde sulcata, an- 
fractu ultimo basi truncato; apertura angusta ; columella tri- 
plicata, plica mediana bipartita ; labro extus incrassato, quasi 
varicoso, margine antice subreflexo, intus bituberculato ; umbi- 
lico patulo, perspectivo. 
Hab. Pulo Penang (Lieut. Taylor). Mus. Cuming. 
This is the most characteristic species of the genus, and is remark- 
able for the great size of the umbilicus, causing the base of the shell 
to appear as if truncated. 
2. PLECOTREMA MONILIFERA, H. & A. Adams. P. testa ovato- 
conica, vie perforata; spira conica, acuta, transversim lirata, 
liris granulosis, moniliformibus, confertis ; apertura angusta ; 
columella triplicata, plica mediana bipartita; labro extus in- 
crassato, intus bidentato. 
Hab. ? Mus. Cuming. 
This species is not distinctly umbilicated, and the conspicuous 
transverse liree are granular, so as to assume a moniliform appear- 
ance; the columella, as usual in this genus, is furnished with three 
plaits, and the outer lip is thickened externally. 
3. PLEcoTREMA PUNCTIGERA, H. & A. Adams. P. testa ovata, 
vie perforata; spira conica, obtusiuscula ; fulva, fusco-zonata, 
transversim punctata, punctis in lineis equidistantibus, trans- 
versis dispositis ; apertura angusta, coarctata ; columella tri- 
plicata, plica postica tuberculiformi, mediana bipartita ; labro 
intus tuberculato, tuberculo mediano valido. 
Hab. Borneo (Lieut. Taylor). Mus. Cuming. 
The most conspicuous feature in this species consists of the nume- 
rous distinct punctures arranged in transverse rows, and in the cha- 
racter of the tubercles in the interior of the outer lip. 
4. PLecorreMA tmperrorATA, H. & A. Adams. P. testa ovato- 
conica, imperforata ; spira elata, obtusiuscula ; pallide fusca, 
