264 CYCLOTACEA. 



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

 the upper margin of the aperture. 



1 Nag£ HUls; coll. W. Roterts, Esq. ( ? ). 



• • 28. Pterocyclus (Spiraculum) andersoni, Bianford. 



40 Bhamfi (type) and right bant of the Irawady 2nd Defile ; coU. Dr. 

 J. Anderson. 



29- Pterocyclus (Spiraculum) avanus, Bianford. 



1 Bham6 j coll. Dr. J. Anderson. 



30. Pterocyclus (Spiraculum) bitubiferus, Theob. 



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



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



31. Pterocyclus (Spiraculum) gordoni, Benson. 



3 Pegu ; ex c. Dr. P. Stoliczka (? coll. W. Theobald, Esq.) 



32. Pterocyclus (Spiraculum) bhamoensis, Theob. 



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

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

 original description. 



2 Near Bham6 ; ex c. W. Theobald, Esq. 



' 33. Pterocyclus (Spiraculum) fairbanki, Bianford. 



2 Pulney HiUs ; colL W. T. Bianford, Esq. 



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



A very interesting form, connecting P. Uspidus with P. 

 gordord. 



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



36. Pterocyclus (Spiraculum) beddomei, Bianford. 



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



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



GenuB DIADEMA, Pse. 



1. Diadema parva, Pse. 



4 Aitutaki ; ex Museum GodefBroy. 



2. Diadema biangulata, Pse. 



3 Aitutaki ; ex Museum GodefEroy. 



