1901.] MOLLUSKS PEOM THE PERSIATST GULE. 355 



ScALA (Clatheus) aculeata Sowb. 



I. Karachi. 3 fathoms, muddy stones. Common at Bombay. 



Scj\la (Clatheus) clatheus L. 

 M.C. Charbar. 



ScALA (Clatheus) gloeiola, sp. n. (Plate XXII. fig. 6.) 



S. testa ovaio-fiisiformi, imperforata, teniii, delicata, alba ; anfracti- 

 bus 9, quorum apicales duo, Iceves, suhpellucidi, cceteris turritis, 

 apud suturas impressis, lonyifudinaliter arctissime et tenuissime 

 lamellatis, lamellis papyraceis, fragilihus, undique serrulato- 

 uncigeris, uncidis acutis, pauUum incurvis, albis, nitidis, circa 

 novem ad undecim apud anfractus idtimis lamellas, lamellis ipsis 

 in eodem anfractu septem et viginti, interstitiis omnium anfrac- 

 tuum spiraliter quadrato-cancellatis ; apertura rotunda^, labro 

 extus serrulato, uncinate, planato, incrassato j peristomate fere 

 continuo. 



Long. 8, lat. 3'50 mm. 



Hab. Gulf of Oman, Maskat. 75 fathoms. 



One of the most truly exquisite of the genus, renowned though 

 it already be for forms of surpassing beauty, albeit S. gloriolais but 

 of small dimensions. But few of its congeners have their lamellae 

 so thickly disposed nor with such elaboration of sculpture, the 

 serrulatioDs being regular though extremely fragile and deciduous. 

 The body-whorl possesses 27 lamellae, and each of these, in turn, 

 from 9 to 11 hooked serruiations. Five minute cancillse give a 

 quadrate appearance to the narrow interstices when view^ed with 

 a good lens. The aperture is round, peristome almost continuous; 

 outer lip flattened, shining, incrassate, beautifully serrulate 

 exteriorly. 



S. echinicosta d'Orb., from the West Indies, would appear to be 

 allied, though not very nearly. 



ScALA (Clatheus) maloolmensis Melv. 



P.G. Gulf of Oman : Malcolm Inlet (Kubbatt Ghazira), 24 

 fathoms. 



The winged, expanded lamellae to some extent resemble those of 

 S. (Opalia) diana; Hinds, from Amboyna ; but notwithstanding this, 

 being more comparable in other particulars with S. (GlatJirus) 

 muricata E.isso, from the Mediterranean, it is best, at all events 

 provisionally, to place it near this last species. 



SoALA (Clathefs) ovalis Sowb. 



I. Bombay (Abercrombie). Identified with but little doubt, but 

 worn examples only found. 



Soala (Clatheus) phillippinaefm Sowb. 



P.G. Gulf of Oman : Jask, dead examples dredged at 

 7 fathoms, 



23* 



