82 RISSOID. 
convex; mouth roundish, ovate, rather reflexed; axis three lines; 
operculum horny, sub-spiral. 
Like the former, but smaller and more tapering. (Gray.) 
Lake Guyon. 
B, egena, Gould, Pro. Bost. Soc., ii., ~.753 A gracilis, Gould, 
U.S. Ex. Tipeap 27. jo wade one)! ates elongate, turreted, deli- 
cate, smooth, or with faint striz of growth, covered with a thin, pale 
green epidermis; spire acute; whorls 5, convex, the last one half the 
length of the shell, and partially perforate; aperture ovate, one-third the 
length of the shell; peristome entire, acute, rising before an indistinct 
umbilical chink, one-third the length of the shell, SOME TINS evasive 
(Gould.) 
Length of axis, 4 inch; breadth, {4 inch. 
Bank’s Peninsula. 
Probably &. antipoda, zealandie, and egena are identical. 
B. speleea, Zrauenfeld ; Verhandl de k.k. Zoologtsch, Botanischen, 
Gesellsch tn Wren., 1863, xil.; Band, ~. 1022. Shell conical, solid, 
bone-colored, sub-transparent, faintlyshining. Five whorls slightly convex; 
suture a little excavated; aperture oval; margin dark, dilated, free 
above, connected below with the mouth, where it covers the narrow 
fissure-like umbilicus. 
Length, ‘rt inch; breadth, ‘o5 inch. (Frauenfeld.) 
Probably small specimens of B. antipodum. 
B. fischeri, Dunker; Mal. Blatt, viii., 1862, ~. 152. Shell 
oblong-conic, sub-turrited, rimate, sub-solid, horny or reddish ; whorls 
6 or 7, rounded, obsoletely striated; suture deep; last whorl half the 
length of the shell; aperture ovate ; peristome thickened, continuous ; 
operculum sub-spiral, thin. 
Length, ‘28 ; breadth, ‘15. (Dunker.) 
Lake Rotoiti and Auckland. 
Distinguished by its convex whorls and deep suture. Dr. Dunker 
agrees with Dr. v. Martens that it may possibly be P. corol/a without 
spines ; but this is very doubtful, as I have never found P. coro//a near 
Dunedin, while 4. fscherd is common. 
B. badia, Gould, U.S. Ex. Ep., xii., p. 126, f 150. Shell minute, 
elongate, ovate-turreted, rather solid, of a Spanish-brown colour; spire 
of five or more whorls, forming an acute spire, eroded at tip; whorls 
moderately convex, shouldered above, the last indistinctly angular at 
periphery ; imperforate ; aperture one-third the length of the shell ; 
peristome complete ; edge black, thick ; Seeman Uren sub- circular, eccen- 
tric ; surface smooth. 
Length, 2 4 inch; breadth, 4 inch. (Gould.) 
Bank’s Peninsula. 
B. reevei, /rauwenfeld, l.c., p. 1024. Shell small, acute, conical, 
solid, dull-whitish, sub-transparent ; whorls 54, angulated, nearly flat and 
perpendicular, step-like ; occasionally the whorls are more convex, and 
angles less step-like, although always distinct ; aperture moderate, oval ; 
