3IKI,VirX: MOLLfSCA FliOJl I'EUSIAX GULF, ETC. 247 



of the * Siboga ' Expedition,^ when it was found both in the Molucca 

 Passage and off the north coast of Sumbawa, in both instances in 

 deep water. The operculum of this genus is found to be sub-oval, 

 paucispiral, with central nucleus, according to the same author. 



EcLiMELLA Egkuia, n.sp. PI. ^11, Fig. 14. 



E. testa minuta, attenuato-fusiformi, alba, delicata, tenui.ssima, 

 fractibus 9^, quorum apicales 2-J inverso-heterostrophi, pervitrei, 

 'idi, globulure.f, cseterisad suturas impres^i.s, ventiicosulis, leevigati.s, 

 jiic illic lineis longitudinaliter incrementalibus notandis, paullum 

 ijitidis, ultimo anfractu magnitudine penultimum et antepenultiraum 

 iequante, obscure ad medium rutizonato, apertura ovata, labro tenui, 

 .umella obscurissime plicata. Long. 4, lat. 1 mm. 

 Ilah. — Pasni, Per.sian Gulf, 40 fathoms. 



\. small, delicate, smooth, but not verj- shining shell, thin in 



;ture, with, inverse-heterostrophe vitreous apex of 2^ whorls, tlie 



: .uainder being smoothi.sh, the penultimate and body-whorls are 



obscurely rufous banded centrally, mouth oval, peri.stome thin, 



'! umella indistinctly uniplicate. The addition of this species 



>es the number of Eulimella found in the Persian Gulf region to 



_'ht. Of these one is E. nitidimma (!Mont.), a European and 



liMtish species, while the remainder are all endemic, so far as is at 



present known. 



TCEBOXILLA (XlSITUEEISy MAXEEXA, n..Sp. PI. XII, Fig. 13. 



T. testa elegantis.sime attennata, perlonga, laete vitreo-Iactea, 

 " "icata, anfractibus ad 17, quorum apicales tres laterali-heterostrophi, 

 1 vitrei, caeteris apud suturas iinpressis, ventricosulis, arete longi- 

 tudinaliter costulatis, costis Isevibus, interdum, sed raro, hie illic 

 vai'icosis, interstitiis sjtiraliter sub lente striatis, striis distantibus, 

 ultimo anfractu infra medium usque ad basim Isevi, costis evanidis, 

 apertura fere rotunda, labro interdum crassiusculo, interdum tenuiore, 

 illulum effuso, columella simplice, recta. Long. 8, lat. l-15mm., 



Ilah. — Persian Gulf, Mus.sandam, at 55 fathoms. 



One of the most truly refined and beautiful of the many species of 



J 'ihonilla which have yet been discovered in this prolific region. 



1 .'; form is most graceful, attenuate, and lengthened; we have taken, 

 ;eed, as the type, a specimen possessing seventeen whorls; more 

 .ally examples occur with fourteen to fifteen. The nuclear whorls 

 laterally heterostrophe, so that we should place them in the 

 *ion JVifiiturris, Dall & Bartsch, the numerous body-whorls being 

 :formly ornamented with smooth, proportionately thickened smooth 

 -, of which ver}' occasionally one is varixed, while the interstices 

 spirally distantly striate. Mouth roundish, outer lip slightly effuse, 



-sometimes thickened, columella straight. It was found locally 



frequent in shell-sand dredged at the depth and locality given above. 



' M. M. Schepman, Prosobranchiata of tJie Siboga Expedition,, pp. 169. 170. 

 pi. XV, fig. 11 ; pi. xii, fig. 1. 



VOL. X. — OCTOBEE, 1912. 17 



