new Gastropoda from the Persian Gulf, &e. 311 
One specimen only dredged, at the locality just given, of a 
superbly tornate and sculptured Pleurotoma, near P. carinata, 
Gray, Kiener?, Doumet, or congener, Smith, being remark- 
able for its regular beaded spiral zone just below the sutures 
of each whoil, above which are two spiral clearly-cut grooves, 
the middle of the upper whorls being most beautifully 
obliquely costulate, the coste terminated above by a double 
sulcus surrounding a narrow spiral lira. The last whorl, 
equalling the others in size, is almost entirely grooved and 
spirally lirate, the liree below being rufous-spotted. Outer 
lip thin, perhaps not quite fully developed, sinus well marked 
but not deep; columella somewhat straight; canal broad and 
rather prolonged. 
The discovery of this mollusk, the finest Gastropod yet 
discovered by Mr. ‘Townsend, if we except Conus clyptospira, 
M. &S., adds another magnificent Pleurotomid to the many 
fine species of this family obtained in contiguous waters, 
during the ‘ Investigator’ Expedition chiefly (such forms as 
P. symbiotes, Wood-Mason & Alcock, P. congener, Smith, and 
P. subcorpulenta, Smith *, occurring to one’s recollection at 
once), and gives another proof of its wonderful development 
in Indian seas. 
Drillia dives, Spo ta. (Bl XOX. fies 15s) 
D,. testa gracili, fusiformi, delicata, albo-cinerea; anfractibus decem, 
quorum tres apicales brunnei, omnino hyalini, levissimi, ceteris 
apud suturas impressis, ventricosulis, longitudinaliter obliqui- 
costatis, costis anfractum apud ultimum circa undecim, undique 
spiraliter striatis, supra, juxta suturas, zona spirali rufa decorata, 
ultimo anfractu simili modo bizonato, ad basim producto albo, 
nitido; apertura oblonga, labro paullum incrassato, sinu lato, 
haud profundo, canali brevi. 
Long. 17, lat. 5 mm. 
Hab. Persian Gulf, Gulf of Oman, Maskat, 15 fathoms. 
Allied to D. clydonia, M. & 8. (Proc. Zool. Soe. 1901, 
vol. ii. p. 437, pl. xxii. fig. 24), but the whorls are not 
angled, the coloration is quite different, and the spiral ribbing 
is coarser in J). dives. 
Drillia philotima{, sp.n. (PI. XXII. fig. 16.) 
D. testa attenuata, fusiformi, solidula, albo-cinerea, aspera; anfracti- 
bus 11, quorum duo apicales vitrei, fusci, ceteris ventricosulis, 
regulariter obliquicostatis, costis anfractus ad superos paucis, 
* Ann, & Mag. Nat. Hist. ser. 6, vol. xiv. pp. 160, 161, pl. iii. fies, 4-8, 
+ uddripos, honoured. 
