178 
Remarkable for its subulate form and umbilicus: its styliform apex 
is formed of transparent nuclear volutions, the first of which is placed 
as in the genus Chemnitzia. 
7. Pyramipetya nitina, A. Adams. P. testa ovato-pyramidali, 
alba, nitida, anfractibus convewiusculis, longitudinaliter costel- 
latis, costellis angustis, rectis, subdistantibus, levibus, interstitiis 
subcrenulatis, anfractu ultimo basi producto; apertura obliqua, 
semiovata, antice subcanaliculata ; columella plicis tribus, plica 
antica duplicata, instrucia. 
Hab. ? Mus. Cuming. 
A small, white, neatly sculptured species, with the anterior colu 
mellar fold double. 
8. PyRAMIDELLA GRAcILIs, A. Adams. P. testa parva, acicu- 
lato-turrita, albida, nitida, linea fusca supra suturas ornata, an- 
Fractibus planis, longitudinaliter costatis, costis rectis, distanti- 
bus, interstitiis levibus ; apertura ovali, antice subcanaliculata; la- 
bio supra calloso, in medio plica valida instructo. 
Hab. Loay, isle of Bohol, Philippines, hard clayey mud, 60 fathoms. 
Mus. Cuming. 
A small, slender, nearly acicular species, somewhat resembling a 
Chemnitzia, but with all the generic characters of Pyramidella proper. 
9. PyRAMIDELLA VARIEGATA, A. Adams. P. testa elongato- 
pyramidali, alba, rufo-fusco maculata et variegata, anfractibus 
septem, planiusculis, longitudinaliter costatis, costis parvis, sub- 
confertis (interstitia equantibus), interstitiis concinne clathratis; 
apertura semiovata, obliqua, antice subcanaliculata; columella tri- 
plicata; labro extus incrassato. 
Hab. Island of Masbate, Philippines, 7 fathoms, sandy mud. 
Mus. Cuming. 
A pretty variegated species, with small, slightly-elevated, regular 
longitudinal ribs. 
8. CONTRIBUTIONS TOWARDS A MoNOGRAPH OF THE GENUS 
CHemnitrzia. By Artuur Apams, F.L.S. etc. 
(Mollusca, Pl. XX.) 
Genus Cuemnitzia, D’Orbigny. 
Animal with a broad head, ending in a narrow bilobed snout, fur- 
nished with a retractile proboscis; tentacles auriform, their inner 
bases connate ; eyes at the inner sides of their base ; fore part of foot 
with a prominent fold or mentum; foot short, lanceolate, operculi- 
gerous lobe with a small conical process on each side. 
Shell turreted, of many whorls, longitudinally ribbed, apex of the 
spire with a persistent embryonic sinistral shell forming the summit ; 
aperture oblong or subquadrate, columella toothless, or with an ob- 
