1901.] MOLLUSKS FROM THE PERSIAN GFLF. 355 



Scala (Clathrus) acfleata Sowb. 



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



Scala (Clathrus) clathrus L. 

 M.C. Charbar. 



Scala (Clathrus) gloeiola, sp. n. (Plate XXII. fig. 6.) 



S. testa ovato-fusiformi, imperforata, tenui, delicate, alba ; anfracti- 

 bus 9, quorum apicales duo, lawes, mbpellucidi, costeris turritis, 

 opud suturas impresses, lowjitudinaliter arctissime et tenuissime 

 lamellatis, lamellis papyraceis, fragilibus, undique semdato- 

 uncigeris, wnculis acutis, paullum incurvis, aZbis, nitidis, circa 

 novem ad undecim apud an fr actus ultimis lamellas, lameUis ipsis 

 in eodem anfractu septem et viginti, interstitiis omnium anfrac- 

 tuum spiraliter quadrato-cancsUatis ; apertura rotunda,, labro 

 extus serrulato, vncinato, jrfanato, incrassato ; peristomate fere 

 continue. 



Long. 8, lot. 3"50 mm. 



Hub. 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. gloriola is but 

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

 so thickly disposed nor with such elaboration of sculpture, the 

 serrulations being regular though extremely fragile and deciduous. 

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

 from 9 to 11 hooked serrulations. Five minute cancilla? give a 

 quadrate appearance to the narrow interstices when viewed 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 (Clathrus) malcolmensis Melv. 



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

 fathoms. 



The winged, expanded lamella? to some extent resemble those of 

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

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

 muricata Risso, from the Mediterranean, it is best, at all events 

 provisionally, to place it near this last species. 



Scala (Clathrus) ovalis Sowb. 



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

 worn examples only found. 



Scala (Clathrus) phillippinaium Sowb. 



P.O. (rulf of Oman: Jaak, dead examples dredged at 



7 fathoms. 



23* 



