MELVILL : TWO NEW SHELLS FROM THE HADEAMAtTT. 225 



Hal. — Plateau about 400 miles east of Aden, Hadramaut, S. Arabia, 

 with the preceding species (W. Lunt). 



Of the same character as both 0. clausum., Sowb., and 0. Hindnorum 

 (Blanford), but much larger, and more obliquely orbicularly depressed; 

 the white callus, entirely covering the umbilical region, is conspicuous 

 and shining ; the whorls are smooth above — they are, when magnified, 

 transversely lirate, but quite smooth beneath. The outer lip is round, 

 slightly reflexed, pure white, mouth within slightly yellowish. 



Three specimens collected. It affords me sincere pleasure to 

 connect with this fine species of Otopoma the name of my friends 

 Mr. and Mrs. Theodore Bent, organizers of the expedition of 1893-94 

 to the Hadramaut, to which region they have lately retumed, on a 

 second and, I trust, even more successful journey. Through the 

 kindness of Mr. T. Rogers and Mr. W. Moss, the type specimens of 

 both these species have been deposited in the National Collection, 

 South Kensington. 



