MELANIID&. 75 
nearly equal size, the interstices between them with faint perpendicular 
strize ; at the base of the body whorl there is a blunt angle, and beneath 
it a fifth keel ; aperture deeply notched at the base, without any protrud- 
ing canal ; the specimens, which are imperfect at the top, have a length 
of °33 inch, and a breadth of ‘1. They show ten whorls. (Martens.) 
Auckland to Stewart Island. 
B. exilis, Hutton, CMM, p. 27. Whorls flat, deeply spirally 
grooved, and transversely plicated ; sulcus deep; aperture rounded; 
canal moderate ; light brown. 
Length -21 ; breadth, 07. 
Stewart Island, 30 fathoms. 
This species sometimes has two nodular ridges on the spire whorls. 
Genus, TRIPHORIS—Deshayes. 
Tentacles clavate at the tips, united at their bases by a sinuated veil. 
Operculum orbicular, few whorled. Shell turreted, sinistral ; aperture 
round, produced anteriorly into a closed tubular canal, sometimes with 
a posterior closed canal. 
T. angasi, Crosse, Jour. de Conch. 1865, pl. 1, f. 12-133 C. mint- 
mus, Flutton, C.M.M., p. 27. Whorls flat, sinistral, spirally grooved and 
transversely plicated : aperture rounded ; anterior canal short, recurved, 
posterior canal very short, open ; pale brown. 
Length, ‘25 ; breadth, °7. 
Stewart Island, 30 fathoms. Bay of Islands. Australia. 
I am indebted to Dr. v. Martens for this identification. 
T. gemmulatus, -Adams and Reeve, Voy. Samarang, Moll., p. 
46. 
Dr. v. Martens says that he has received this species from New Zea- 
land. I have not been able to obtain a description of it. 
FAMILY—MELANIID. 
Radula long and linear ; lateral teeth uncinate, multicuspid ; rostrum 
broad, annulated ; tentacles subulate, with the eyes on bulgings at their 
outer sides ; mantle margin fringed, with a rudimentary siphonal fold in 
front ; gill composed of rigid cylindrical plates ; foot broad and short, 
angulated in front ; operculum horny, ovate, sub-spiral. Shell turreted, 
covered with a thick dark-colored epidermis ; aperture often channelled 
-or emarginate in front ; outer lip simple; fluviatile, sometimes vivipar- 
ous.* 
Sub-Family—Melanopsine. 
Operculum ovate, sub-spiral. Shell covered with an epidermis ; 
aperture with a distinct notch in front. 
* Melania mirifica, Adams (P.Z.S., 1853, p. 99), is said by Reeve to come from 
New Zealand, but Adams gives New Ireland as the habitat. 
