I871.J 



DR. J. MURIE ON RHINOCHETTJS JU1JATCS. 



647 



Hab. Guadalcanar Island, Solomon Islands. 

 Closely allied to II. lactiflua and H. isabellensis ; but this species 

 has a large, deep, open, umbilicus. 



Helix belmorei, sp. nov. (Plate LII. fig. 12.) 



Shell with a large open umbilicus, broadly trochiform, rather solid, 

 opaque, obliquely finely irregularly striated, dark chestnut ; whorls 

 6|, flat ; suture very indistinct ; spire bluntly conoid ; the last whorl 

 very sharply keeled, not depressed in front ; base flat, more coarsely 

 striated than above with a few irregular longitudinal striae ; excavated 

 round the umbilicus ; aperture trapezoid ; peristome sharply angled 

 and pointed at the keel, white and thickened towards the columellar 

 margin, which is scarcely expanded. 



Diam., greatest TOO, least 0'90; height 050 of an iuch. 



Hab. Solomon Islands. 



Helicina jana, sp. nov. (Plate LII. fig. 13.) 



Shell conoid, rather solid, of a dull orange-brown colour, very 

 finely irregularly transversely striated ; apex pointed and finely spi- 

 rally striated ; whorls 4g to 5, flat, last bluntly keeled ; aperture 

 triangular, rounded at the angles ; base rounded, half covered with 

 a thin, expanded, white callus ; peristome thickened, white, conti- 

 nuous with the columella, which gradually expands out into the 

 callus, partially covering the base. 



Diam., greatest 0* 17, least - 14 ; height 0*16 of an inch. 



Hab. Port Macquarie, east coast of Australia ; found under leaves 

 on the ground. 



DESCRIPTION OP PLATE LII. 



Figs. 1,1a. Voluta (Amoria) auslra- 

 lice, p. 643. 



2. Partula peasei, p. 644. 



3. Bulimus selkrsi, p. 644. 



4. Helix andersoni, p. 644. 



5. scandens, p. 645. 



6. kempseyensis, p. 645. 



Fig. 7. Helix macqtiariensis, p 



8. 



9. 

 10. 

 11. 

 12. 



it y/iuuyuuritmsts, p. 645. 



guadalcanarensis, p. 645. 

 sellersi, p. 646. 

 compluviatus, p. 646. 

 hunteri, p. 646. 

 belmorei, p. 647. 



12. oeunorei, p. <o-±t. 



13. Helicina jana, p. 647. 



fi^w 



7. Additional Notice concerning the Powder-Downs of Rhi- 

 nochetus jubatus. By James Murie, M.D., F.L.S., 

 F.G.S.j &c, late Prosector to the Society. (Communi- 

 cated by Prof. Newton, F.R.S.) 



[Received October 19, 1871.] 



In my memoir on the Kagu, Sun-bittern, and Boatbill, read in 

 1867, but only published by the Society this year, I enter at some 

 length into the nature of the plumage of these aberrant types. 

 After a somewhat complicated study of the powder-downs, their 

 structure, situation, and mode of examination, I propose a set of 

 terms as expressive of their distribution consonant with Nitzsch's 



