26 PLACOSTYLUS, LORD HOWE ISLAND. 



5. PFR., Monogr. iv, p. 447 ; vi, 83 GASSIES, Faune N. Gated., 

 p. 47, pi. 3, f. 2. CROSSE, Journ. de Conchyl. 1864, p. 128 ; 1894, 



p. 171 ETHERIDGE, Austr. Mus. Mem. no. 2. Lord Howe Island, 



p. 27 Placostylus bivaricosus Gask., HEDLEY, Records of the 



Australian Museum, i, no. 7, p. 140, pi. 21, f. 4 (jaw), pi. 22, f. 3 

 (teeth) (1891). KOBELT, Conchyl. Cab., p. 53, pi. 13, f. 4, o. 



The typical form of this species is smaller than P. shongi of New 

 Zealand, with less convex whorls and abruptly truncated columella. 

 It also lacks the white subsutural border of P. shongi and P.jibratus, 

 which seem to be its nearest allies. 



" This species speaks eloquently of a recent land connection ex- 

 tending on the one side to New Caledonia and on the other to New 

 Zealand. It is confined to Lord Howe Island." (Hedley.) 



The variability of the species is great, as the works of Hedley and 

 Etheridge show ; there being three recent forms and one fossil found 

 within the confines of an island less than seven miles long and about 

 a mile wide. 

 Var. CUNICULINSUL^E (Cox). PI. 11, fig. 5, pi. 10, fig. 1. 



Shell broadly rimate, small, thin and light, olivaceous yellowish 

 with brown streaks. Whorls 5^, aperture ovate, the outer lip a 

 trifle expanded, with slight, reddish, internal thickening ; columella 

 concave, not calloused or truncate below, and with the parietal wall, 

 cherry-red. Alt. 42, diam. 20 mill. 



Rabbit, or Goat Island, in the lagoon of Lord Howe Island. 



Bulimus cuniculinsulce Cox, P. Z. S. 1872, p. 19, pi. 4, f. 3. 

 PFR. Monogr. viii, p. 118 B. bivaricosus var. cunictdoides Cox, 

 BRAZIER in Etheridge, Austr. Mus. Mem. no. 2, p. 30 Placostylus 

 bivaricosus var. cuniculinsulce Cox, HEDLEY, Rec. Australian Mus. 

 i, no. 7, p. 141. Placostylus cuniculinsula Cox, KOBELT, Conchyl. 

 Cab., p. 71, pi. 17, f. 2, 3. 

 Var. ETHERIDGEI (Brazier). PI. 12, figs. 9, 10. 



A large, thin, elongate form, exhibiting transverse malleated 

 furrows. On the last whorl the epidermis is nearly black, the bright 

 cherry-red of the typical aperture has almost disappeared, only the 

 columellar plication retaining a trace ; the nacreous lining of the in- 

 terior and the callus on the body-whorl are tinged a greenish-blue. 

 Length 65, breadth 27, length of aperture 30, breadth 20 mill. 

 (Hedley.) 



Under the wall of Mount Ledgbird, Lord Howe Island. 



