110 MOLLUSCA. 
TRUNCATELLA AURANTIA (Gould ). 
Testa parva, decollata, conico-cylindracea, aurantia, sub-perforata, lon- 
gitudinaliter confertim clathrata ; clathris elevatis, rectis, numero ad 
quadriginta in singulis anfractibus: spira anfractibus quinque con- 
vexis : apertura obliqua, ovata ; peristomate albo, continuo, reflexo. 
Truncatella aurantia, GouLp; Proceed. Boston Soc. Nat. Hist., i. 
208. March 1847. Expedition Shells, 39. 
SHELL small, elongated, conic-cylindrical, orange-coloured. There 
remain five whorls after truncation, which are quite convex, and barred 
longitudinally with erect, elevated cross-bars, about forty in number 
on each whorl. Aperture oblique, oval; lip white, slightly reflexed, 
continuous, advancing at base, thickened on the left margin, where it 
covers a slight umbilical chink; base angular. 
Length three-tenths of an inch; breadth one-tenth of an inch. 
Obtained at Mangsi Island, near Borneo. Prckering. 
Its principal characters are its large size, very convex whorls, and 
very numerous bars. ‘J. Caribbeorum, Sowb., is often of the same 
colour, but is more robust, the whorls less convex, and the bars less 
numerous and less elevated. 
Figure 125, front view of the shell, enlarged; 125 a, side of the last 
whorl, enlarged ; 125 4, natural size. 
TRUNCATELLA PoRRECTA (Gould). 
Testa parva, elongata, sub-cylindrica, decollata, allida ; spira anfracti- 
bus superstitibus quatuor convexts, clathris humilibus acutis ad sexde- 
crm instructis, ad intervallos minutissime et longitudinalhter striatis : 
apertura rotundato-lunata, anfractui penultimo late sejuncta ; peristo- 
mate continuo, extrorsum expanso: operculum laminis arrectis radian- 
tibus eccentricis ornatum. 
