IG On Murine MoUuscu from the Persian Gulf, (t'C. 



quorum apicalis ipse bulbosus, pervitreus, duo liiuc proximi 

 vitrei, arcle longitudiiialiter costulati, tertius unicarinatus, carina 

 crenulata, caeteri^ apud suturas irapressis, spiraliter tornatis, 

 bicarinntis, carinis regulariter brunnco-maculatis et lineatis, 

 interstitiis arcto spiraliter liratis, albis, ultimo anfractu multi- 

 lirato, ad peripheriam fortiter bicariuato, carinis, praesertim 

 superiore, rcgulariter brunneo-macalatis, liris omnibus simili 

 modo ad basin brunneo-lineatis ; apertura ovata, labro tenui, 

 sinu conspicuo, columella rocta, canali prolongato. 

 Long. 32, lat. 6 mm. 



Hah. Persian Gulf. 



Of this fine addition to the Pleurotomidae I have only 

 seen tlie type specimen, but am informed that others liave 

 been found. This is in very perfect condition, and belongs 

 to the typical section of tlie o-enus, whicli has been compelled 

 to have its well-known generic name Pleurotoma, Lam., 1799, 

 altered, owing to one year's priority of Turris only. It 

 perhaps most resembles the larger and more elongate T. mar- 

 moruta, Lam., but the abbreviate form distinguishes it at a 

 glance from botli this and other allies. I am especially 

 indebted to Mr. G. B. Sovverby for first calling my attention 

 to this species. 



Retusa turrigera, sp. n. (PI. IL fig. '1^.) 



M. testa abbreviato-cylindrica, tenui, alba vel pallide stramiuea, 

 spira gradata ; anfractibus 4, quorum apicalis parvus mamillatus, 

 subvitreus, cajteris turrigeris, Isevibus, parum nitidis, ultimo 

 interdum ad medium constrictulo, interdura normali ; apertura 

 ovata, subtus latiore, labro fere recto. 



Long. 2*75, lat. 1-25 mm. 



Hab. Persian Gulf, Mussandam. 



A compact species, the whorls angularly turreted above, 

 quite smooth, dull white or straw-coloured, the mouth widened 

 basally, ovate ; outer lip sometimes, with basal wiiorl, con- 

 stricted in the centre, at other times quite normal and straight. 

 We do not know a near ally, at all events in this fauna. 



Lepton oritntale, sp. n. (PI. II. fig. 29.) 



L. testa subsequilaterali, percompressa, explanata, tenui, alba, sub- 

 pellucente, superficie delicate scd irregulariter concentrice striata, 

 striis sericatulis, umbonibus prominulis, approximatis, margine 

 dorsali antice paullum excavato, ventrali prope recto, pagina 

 interna albo-lactea, cardine normali. 



Alt. 3, diam. 4 mm. 



