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PievRoToMA VIOLACEA. Pleur. testd elongatd, acuminata, violaced ; 
anfractibus decenis multicarinatis, longitudinaliter minutissime et 
creberrime striatis; carinis duabus eminentioribus ; labro tenui, 
acuto, crenulato ; sinu laterali inter carinas ; aperturd ovali ; colu- 
mella biplicata ; canali brevi. Axis 8 lin. 
Hab. North coast of New Guinea and Straits of Macassar. From 
seven to twenty-two fathoms; sandy mud. Also collected by Mr.Cu- 
ming at the Philippines. 
The folds on the columella, for which this species is remarkable, 
are not to be met with in all the specimens. 
PLEUROTOMA RADULA. Pleur. testd pyramidali, acuminatd, corned ; 
anfractibus nonis, lineis decussatis, uniseriatim tuberculatis ; tuber- 
culis sublunatis ; labro tenui, acuto ; sinu laterali pone seriem tuber- 
culorum ; suturd lined elevatd instructd ; aperturd ovali; canali 
brevi. Axis 7 lin. 
Hab. Straits of Malacca. In seventeen fathoms ; mud. 
Cravatuxa, Lamarck. 
The shells of this genus are subfusiform or clavate; the canal 
sometimes so short as to be almost wanting, at others somewhat 
produced and recurved; sinus superior to the most prominent part 
of the whorl, with a callous everted margin; inner lip often pro- 
duced ; suture frequently embellished; sculpture nearly always lon- 
gitudinal; outer lip with a slight inferior sinus. This genus is 
rather less tropical in its geographical relations than Pleurotoma. In 
attempting to trace the limits of variation, it may be observed that 
the canal is liable to fluctuate in length, as may be seen in C. dupli- 
cata, Sow. (sp.); also in the length of the spire. Varieties in colour 
are not infrequent, and have been remarked in the above species, in 
C. flavidula, Lamarck (sp.), and in C. crenularis, Lamarck, each of 
which has light and dark varieties. Lastly, the series of tubercles 
which some display are usually connected by a keel, and the par- 
ticular sculpture fluctuates between each, as occurs in a remarkable 
manner in C. cincta, Sow. (sp.) 
CuavatuLa minitaris. Clav. testd turritd, elongata, acuminata, 
albidaé ; anfractibus superné concavis et angulatis, plicis numerosis 
longitudinalibus, granosis lineis decussatis ; prope suturam carind 
subnodosd instructa ; labro intis levi ; apertura lineari, in canali 
brevi recurvo desinente. Axis 20 lin. 
Hab. Veragua, Central America; in eighteen fathoms. Panama ; 
in from eight to thirty fathoms ; mud. 
CuavatTuLa Sinensis. Clav. testd fusiformi, acuminata, corned ; 
anfractibus undenis, subplanulatis, medio costulatis, lineis fuscis 
decussatis ; suturd granoso-carinata ; labro intis levi; apertura 
ovali ; canali mediocri. Axis 9 lin. 
Hab. New Guinea; Straits of Macassar; China Sea. In from five 
to twenty-one fathoms ; mud. 
