264 CYCLOTACEA, 



the suture less excavated ; and only a small expanded tube at 

 the upper margin of the aperture. 



1 Naga HiUs; coll. W; Roberts, Esq. ( ? ). 



28. Pterocyclus (Spiraculum) andersoni, Bianford. 



40 Bham6 (type) and right bank of the Irawady 2nd Defile ; coll. Dr. 

 J. Anderson. 



29. Pterocyclus (Spiraculum) avanus, Bianford. 



1 Bham6; coll. Dr. J. Anderson. 



30. Pterocyclus (Spiraculum) bitubiferus, Theob. 



(Almost certainly a mere variety of P. gordoni). 



1 Near Bham6 (typical) ; ex c. W. Theobald, Esq. 



31. Pterocyclus (Spiraculum) gordoni, Benson. 



3 Pegu J ex c. Dr. F. Stoliczka (? coll. W. Theobald, Esq.) 



32. Pterocyclus (Spiraculum) bhamoensis, Theob. 



Very close to P. avanus, but properly, I consider, sepa- 

 rated by Mr. Theobald, for the reasons given in his excellent 

 original description. 



2 Near Bhamo ; ex c. W. Theobald, Esq. 



33. Pterocyclus (Spiraculum) fairbanki, Bianford. 



2 Pulney Hills ; coll. W. T. Bianford, Esq. 



34. Pterocyclus (Spiraculum) nevilli, Grod.-Aust. 



A very interesting form, connecting P. hisjndus -with P. 

 gordoni. 



1 Dihiri, 2,000 feet (typical) ; coll. Major H. H. Godwin-Austen. 



35. Pterocyclus (Spiraculum) beddomei, Bianford. 



1 Kimety Hills, near Vizagapatam (typical) ; ex c. W. T. Bianford, Esq. 



2 Near Ganjam, Orissa; coll. V. Ball, Esq. 



Genus DIADEMA, Pse. 



1. Diadema parva, Pse. 



4 Aitutaki ; ex Museum Godeffroy. 



2. Diadema biangulata, Pse. 



3 Aitutaki ; ex Museum Godeffroy. 



