BY C. HEDLEY. 113 



Type in British Museum. 



Hal). — Duchateau Islets, Louisiade Archipelago (Forbes). 

 106. H. insularum, n.sp. 

 (Plate xn. bis, fig. 44.) 



Shell depressedly trochiform, sharply keeled ; colour light 

 yellow, usually unicolorous, occasionally with a spiral chestnut 

 band above the periphery, occupying the central third of the space 

 between the keel and the suture, more rarely the band broadens 

 till the keel and a sutural thread alone remain yellow ; whorls 

 4 h, flattened ; suture linear ; apex acute ; sculpture, 9 spiral 

 lyrse above the periphery and 20 below it crossed by close 

 incremental striae ; basal callus well defined, malleated, centre of 

 base smooth ; aperture subvertical, lunate, within the basal 

 margin containing a thread-like rib which retreats to the 

 columella, peristome everywhere expanded. Diam. maj. 14, min 

 11, alt. 10 mm. 



Type in Queensland Museum. 



Hab. — Suclest Island, Louisiades (Kowald and Belford); 

 abundant. 



var. sinus, var.no v. 



(Plate xn. bis, fig. 45.) 

 Much smaller than type, six lyrse above, sixteen below the 

 periphery. Diam. maj. 8, min. 7, alt. 5 mm. 



Hab. — Village of Mita, Milne Bay, and village of Polatona, 

 Bently Bay (Hedley) ; abundant, found crawling upon shrubs and 

 trees. 



var. muruensis, var.nov. 



Diam. maj. 10, min. 8, alt. 6 mm. 



Hab. — Murua or Woodlark Island (Kowald and Belford); 

 abundant. 



var. trobriandensis, var.nov. 



Diam. maj. 11, min. 9, alt. 8 mm. 



Hab. — Trobriand Islands (Kowald and Belford); eight 

 specimens. 



V 



