2 Mr. E. A. Smith on Mollusca from the 
PONTIOTHAUMA *, gen. nov. 
Testa fusiformis, haud umbilicata, antice rostrata, oblique plicata, 
spiraliter lirata et sulcata; apertura antice breviter canaliculata ; 
columella simplex, haud plicata; labrum tenue, postice late sed 
haud profunde sinuatum ; operculum nullum. 
Animal cecum, rostro magno, late expanso instructum; radula 
nulla. 
The examination of the soft parts of this remarkable 
mollusk has kindly been undertaken by Mr. 8. Pace, and the 
results of his investigation will be published subsequently. 
From a preliminary examination he is inclined to believe that 
its relationship will prove to be with the Pleurotomatide. 
The enormously expanded rostrum, and the absence of eyes, 
radula, and operculum, at once separate this genus from any 
which it approaches in shell-characters. Conchologically it 
bears some resemblance to the plicate forms of Sipho (S. fus?- 
formis, &c.). 
Pontiothauma mirabile. (Pl. I. fig. 1.) 
Testa fusiformis, turrita, alba, epidermide plus minus induta ; spira 
elongata, acuminata; anfractus 10?, superstitientes septem con- 
vexi, regulariter lente accrescentes, oblique et flexuose costati 
(costis supra et infra evanescentibus), spiraliter fortiter et con- 
fertim lirati, ultimus subtumidus, costis obliquis gracilioribus et 
minus prominentibus instructus, autice breviter rostratus; aper- 
tura elongata, antice in canalem brevem producta, longit. totius 4 
peulo minor, intus alba; columella rectiuscula; labrum hand 
incrassatum, prope suturam late, sed haud profunde sinuatum, in 
medio prominens, arcuatum. 
Longit. 136 millim., diam. 52; apertura 65 longa, 27 lata. 
Hab. Off the Malabar coast, lat. 10° 7 50” N., long. 
74° 42’ 30” E., in 1250 fathoms. 
When viewed from behind this remarkable shell bears a 
strong resemblance to an elongate specimen of the common 
whelk, Bucctnum undatum. It has all the aspect of a 
northern form, and one can scarcely credit the fact ot its living 
so far south as the Indian Ocean. Only a single specimen 
was obtained. 
Pontiothauma abyssicola. (PI. I. fig. 2.) 
Testa elongata, turrita, solidiuscula, imperforata, alba, epidermide 
tenui pallide olivaceo-viridi induta; anfractus sex, superne exca- 
* mévrios, marine; and 6aipa, a wonder. 
