42 GENA. 



transversely very minutely striate ; outer lip straight ; spire posterior, 

 whorls angulated, slightly elevated ; variously mottled with pink and 

 white ; concentric striae red, spire yellowish or white. 

 Length 6, diam. 4 mill. (Pse.) 



Paumotus.. 



G. rosacea PSE., Amer. Journ. Conch, iii, p. 284, t. 24, f. 1. 



This is very similar to the last species. The close, fine, spirals of 

 the penultimate whorl become nearly obsolete on the last, except on 

 the base. The coloration consists of close fine V-shaped reticulations 

 on a lighter ground, but sometimes is "pinky-cream, unicolored, or 

 dark reddish, like G. caledonica, with radiating zigzags of white. 



Length KH, breadth 6 mill. ; convexity 2 mill. ; aperture, length 

 8|, breadth 5 mill. 



G. NEBULOSA A. Adams. PI. 55, fig. 13. 



Shell haliotoid, ovate-oblong, the back all over striated ; white, 

 clouded with reddish-brown ; spire somewhat prominent, whorls 

 angular; aperture elongate, oval ; columella covering the umbilical 

 fissure with a thick callus. (Ad.) 



Australia. 



G. nebulosa AD., P. Z. S. 1850, p. 38 ; Thes. Conch, ii, p. 830, t. 

 173, f. 23. 



This is, I believe, a decidedly young specimen of a species 

 immediately allied to G. Icevis and rosacea of Pease. 



G. CALEDONICA Crosse. PI. 55, figs. 10, 11. 



Shell imperforate, depressed ovate, thin, slightly shining, under a 

 lens showing scarcely conspicuous transverse impressed stride, some- 

 what decussated by very delicate lines of increment, roseous-brown, 

 apex varied with white ; spire scarcely prominent, apex rounded ; 

 sutures linear; whorls 3, rather convex, the last large, elongated, 

 the base somewhat concave ; aperture subovate, striatulate inside, 

 lined with a thin layer of nacre ; peristome slightly thickened, mar- 

 gins joined by a white callus, columellar and basal rather thick, 

 scarcely pearly, white, the outer subreflexed, acute, pearly. 



Diam. maj. 6, min. 3, alt. H mill. (Crosse.) 



New Caledonia. 



Gena caledonica CROSSE, Journ. de Conchyl. 1871, p. 330 ; I. c.. 

 1872, t. 13, f. 4. 



