182 
The canal of this Muriciform species, though somewhat indistinct, 
fully entitles it to a place amongst the Pleurotome. 
PLEUROTOMA ALBIBALTEATA. leur. testdé ovato-oblongd, luted, 
albibalteatd, anfractibus convewis, transverse lineatis, longitudi- 
naliter noduloso-costatis ; labro incrassato, sinu parvo ; canali brevi, 
recurvo. 
Conch. Icon., Pleurotoma, pl. 10. f. 84. 
Hab. Island of Ticao, Philippines (found in sand at the depth of 
six fathoms) ; Cuming. 
The white belt which passes round each of the whorls of this shell 
is of a peculiarly opaque nature. The ribs are more distant from each 
other in some specimens than in others, and the lower part of the 
last whorl is occasionally stained with dark brown. 
Prrvrotoma T'r1ronorpEs. Pleur. testd subovali, apice acuto, 
fulvd, pallide albifasciatd ; anfractibus convexis, costis longitudi- 
nalibus, subtilissimé nodulosis, linets transversis elevatis eximie 
cancellatis ; labro incrassato, sinu parvo ; canali brevi, subrecurvo. 
Conch. Icon., Pleurotoma, pl. 10. f. 85. 
Hab. Bais, island of Negros, Philippines (found in coral sand at 
the depth of seven fathoms) ; Cuming. 
This shell is of a duller and more uniform colour than the prece- 
ding ; the last whorl is more ventricose, and the longitudinal ribs are 
finer and more numerous. 
PLEUROTOMA ABBREVIATA. Pleur. testd abbreviato-fusiformi, c@e- 
ruleo-albd, nigro maculatd et punctatd ; anfractibus medio angulato- 
carinatis, carind medio partitd, superne depressis, funiculo maximo 
nigro-maculato cingulatis, inferne multifuniculatis, funiculis mi- 
noribus nigro lineatis et punctatis ; canali vix elongato. 
Conch. Icon., Pleurotoma, pl. 10. f. 86. 
Hab. Island of Masbate, Philippines (found on the reefs at low 
water) ; Cuming. 
A very interesting species, which looks at first sight like a broken 
portion of the P/. tigrina. A number of specimens were collected 
by Mr. Cuming at the above-mentioned island. 
PLEUROTOMA BIJUBATA. Pleur. testd cylindraceo-pyramidali, fuscd, 
Suscescente carinatd ; anfractibus convexis, equidistanter carinatis, 
carinis duabus centralibus jubatis ; aperturd brevi; canali brevis- 
simo. 
Conch. Icon, Pleurotoma, pl. 10. f. 87. 
Hab. Island of Burias, Philippines (found under stones at low 
water); Cuming. 
Of the two crested keels which encircle this very characteristic 
species, the upper one is the more faintly developed. 
PLEUROTOMA PLANILABRUM. Pleur. testd ovato-oblongd, apice 
acuto’; rubido-fuscd ; anfractibus convezis, transverse lineatis, lon- 
gitudinaliter costatis, costis fere obsoletis ; aperturd oblongd, labro 
plano, rubido, intis denticulato ; canalt brevissimo. 
