218 Prof. F. J. Bell on the 
dulating, as the ribs are produced upward upon those above 
them, leaving little concavities between. 
Pleurotoma (Mangilia) Pellyt. 
Testa elongate ovato-fusiformis, alba, inter costas superne prope 
suturam et versus basim anfractus ultimi purpureo-fusco tincta ; 
anfractus 8, primus parvus, convexus, sequentes 2 leves, medio 
carinati, caeteri leviter convexi, costis 7 continuis (in anfr. ultimo 
basi fere continuis) instructi, ubique spiraliter minute striati ; 
apertura parva, ovata, longitudinis totius ;& equans; labrum 
costa ultima maxima extra valde incrassatum, vix sinuatum ; 
columella callo crassiusculo labro juncto amicta; canalis brevis- 
simus. 
Long. 63 mill., diam. 24. 
Hab. Persian Gulf (Colonel Pelly). 
The seven strong ribs are continuous up the spire, thus 
making the shell heptagonal. ‘The labrum has a purple-brown 
spot, which is the termination of the interrupted band around 
the base of the body-whorl, near the lower end of it. 
Pleurotoma (Mangilia ?) acutangulus. 
Testa elongata, subfusiformis, alba, juxta suturam et ad caudam 
purpureo-rufo tincta, et circa medium anfr. ultimi zona angusta 
ejusdem coloris cincta; anfractus 8, supremi duo leves, tertius 
granose reticulatus, ceeteri medio acute angulati, costis subacutis 
7-8 supra spiram irregulariter continuis et versus basim anfr. 
ultimi evanidis instructi, circa angulum lira spirali tenui cincti, 
et ubique exiliter spiraliter striati; apertura albida, zona externa 
ornata, longit. totius + paulo superans ; labrum costa ultima in- 
crassatum, vix sinuatum ; canalis breviusculus, angustus. 
Long. 74 mill., diam. 23. 
Hab. ——? 
This species is remarkable for the acute angulations of the 
whorls, the spiral liration at the angle, and the purplish-red 
bands at the suture and the middle of the last whorl, the 
latter being visible within the aperture. The number of ribs 
appears to vary from seven to eight; and they are not quite 
regularly continuous from the apex downwards. 
[To be continued. } 
XIX.—Note on the LEchinoderm-Fauna of the Island of 
Ceylon, together with some Observations on Heteractinism. 
By Prof. F. JEFFREY BELL, M.A. 
WE know so little about the fauna of the seas around the 
island of Ceylon that, though there is no reason to suppose 
