Zoological Society. ^95 



16. AcHATiNA Deshayesi, Pfr. A. testa turrifo-oratd, tenuius- 

 culd, sublceviyatd, nitidd, corneo-fuscd ; spird elongatd, convexd, 

 apice ohtusuld ; suturd simplice, mbprofimdd ; anfractibus 7 

 convexis, ultimo f longitiidinis subceqnante, basi rotundato ; 

 columeUd subtortd, late et oblique truncatd ; aperturd vix 



.obliqud, rhombeo-semiovali ; peristomate simplice, obtuso, mar- 



ffine dextro subrepando. 

 Long. 1 1, diam. .5 mill. 

 Hab. in insula Ceylon. 



17. AcHATiNA CEREA, Pfr. A. testd oblongo-turritd, tenui, sub- 

 tiliter et regulariter striatd, nitidd, pelhicidd, pallide cered ; 

 spird rectdineari, apice obtusd ; suturd mediocri, minute crenu- 

 latd ; anfractibus 8 vix convexis, ultimo ^ longitudinis vix su- 

 perante, infra medium subangulato ; columelld curvatd, abrupte 

 truncatd; aperturd obliqud, oblongd ; peristomate simplice, 

 recto, margine dextro leviter arcuato. 



Long. 14, diam. 4f mill. 

 Hab. Fernando Po (Fraser). 



18. Helicina subl-EVIGATA, Pfr. H. testd coiioideo-depressd, 

 soliduld, sublcevigatd, nitiduld, unicolore rubelld vel albidd, 

 subtus violaceoconatd; spird breviter conoided, vertice obtusulo; 

 anfractibus 5 vix convexiusculis, ultimo latiore, peripherid ob- 

 solete angulato ; aperturd diagonali, subsemiovali ; columelld 

 brevi, simplice, callum crassiusculum, circumscriptum retrorsum 

 emittente ; peristomate simplice, breviter expanso, margine 

 basalt fere rectilineari, ad columellam subdentato. Operculum 

 tenue, corneum. 



Diam. maj. 8, min. 61 alt. 5 mill. 

 Hab. in No^ns Hebridibus. 



Notes on the Diduncxjlus, a species of Pigeon supposed 

 TO be peculiar to the Navigator's Islands. By Lieut. 

 THE Hon. F. Walpole, R.N. Communicated by J. H. 

 GuRNEY, Esa., F.Z.S. 



May 25. 

 Lieut. Walpole always saw this bird (when in its natural state) 

 either perching on trees or flying about them, — feeding by day and 

 roosting by night among the branches. He never saw them on the 

 ground, though he has seen places where they appeared to have been 

 scratching, either for roots or for other food. The crops of the spe- 

 cimens which he examined were, however, generally filled with green 

 berries, which grew in clusters on a species of ash. The number of 

 specimens so examined was considerable, as the birds formed Lieut. 

 Walpole' s principal food while on these islands. He found the flesh 

 most excellent, though in colour darker even that of the English 

 wood-pigeon. The flight of the Didunculus is mostly limited to a 

 transit from wood to wood, as they rarely attempt to pass from one 

 island to another, — the distance between the islands varying from ten 

 to eighty nautical miles. 



