210 Mr. E. A. Smith on 
cavati, inferne convexi, costis obsoletis 10 instructi, liris spirali- 
bus 5-6 (3—4 supra costas incrassatis) cincti; anfr. ultimus liris 
-ad 15 ornatus; apertura longitudinis totius 4 paulo superans ; 
sinus mediocris ; canalis brevissimus, leviter recurvus. 
Long. 84 mill., diam. 3. 
Hab. St. Vincent, West Indies. 
The white band encircling the whorls includes three of the 
spiral lirations which are thickened upon the obsolete ribs ; 
in fact, each rib might be said to be composed of the thick- 
ening of the lire. 
Pleurotoma (—— ?) albata. 
Testa elongata, fusiformi-pyramidalis, alba; anfractus 9, primus 
levis convexus, sequentes duo leves medio carinati, ceteri con- 
vexi, costis distantibus crassiusculis 6 supra spiram continuis (in 
anfr. ultimo paululum infra medium evanidis) instructi, sutura 
filo-carinata discreti, et lis tenuibus spiralibus prominentibus 4 
(suprema quam ceteris valde tenuiore) cincti; anfr. ultimus liris 
circiter 15 ornatus; apertura longitudinis totius 4 adequans ; 
labrum tenue, superne subprofunde sinuatum, intus liris 4-5 in- 
trantibus munitum; columella levis, callo tenuissimo induta ; 
canalis brevis, leviter recurvus, angustus. 
Long. 8 mill., diam. 23. 
Hab. Persian Gulf (Pelly). 
This species, when viewed with the apex towards the eye, 
appears hexagonal, as the six ribs are continuous up the spire. 
The spiral lirations, although fine, are conspicuously promi- 
nent. The form of this species approaches that of P. pyra- 
midula, Reeve ; but the sculpture is totally distinct. 
Pleurotoma (Crassispira) microstoma. 
Testa solida, elongata, subturrita, flavida; anfract. 9-10, primi 2 
longitudinaliter exiliter crebre costati, liris spiralibus subcancel- 
lati, ceeteri superne ad suturam carina undulata cincti, infra cari- 
nam sulco angusto tenuiter striato excavati, infra sulcum costis 
crassis contiguis, liris spiralibus nodulosis (in anfr. superioribus 
3, in ultimo circiter 12) transitis (in anfr. ult. costis 12 fere ad 
basim continuis, una maxima crassissima pone labrum sita) in- 
structi; apertura parva, longitudinis totius haud 4 equans; 
canalis brevissimus, recurvus; columella callosa, ad suturam tuber- 
culata ; sinus parvus. 
Long. 16 mill., diam. 5. 
Hab. Ceylon (E. L. Layard). 
This species is remarkable for having the first two whorls 
large, and not smooth and glassy as in most other species, 
but finely ribbed and lirated. ‘The aperture is very small. 
