130 OPEAS GRACILE. 



increasing, the last half the total length ; suture deep. Aper- 

 ture ovate-elongate; columella slightly 'calloused, peristome 

 simple. Length 7, diam. 2.5 mm. (Gass.). 



New Caledonia: Art Island (Montrouzier). 



Bulimus diaphanus GASS., Journ. de Conchyl. vii, 1859, 

 p. 370; not of Pfr. 1854. Bulimus 'souverbianus GASS., 

 Faune Conch. Nouvelle-Caledonie i, p. 52, pi. 2, <f. 5 (1863). 

 PFR., Monogr. vi, 98. Opeas s., CROSSE, J. de C. 1894, 

 p. 299, 



B. artensis Gass. (pi. 24, fig. 32). Shell imperforate, 

 turbinate, rather lengthened, pale corneous, thin, diapha- 

 nous, glossy, longitudinally delicately striate. Whorls 7 to 8, 

 slightly convex, regularly increasing, the last forming one- 

 third the total length; suture deep, apex rather obtuse. 

 Aperture ovate-elongate, columella arcuate, slightly cal- 

 loused; peristome simple, acute. Length 9, diam. 2 mm. 

 ( Gass. ) . 



Art Island, New Caledonia. 



Bulimus artensis GASS., Journ. de Conchyl. 1866, p. 50; 

 Faune N.-Caled. ii, p. 94, pi. 3, f. 9. PFR., Monogr. vi, 98- 

 Opeas artense CROSSE, J. de C. 1894, p. 300. 



Var. neocaledonicum nov. (PL 24, fig. 29.) A narrow, 

 slowly-tapering and attenuate-spired form perhaps refer- 

 able to 0. gracile as a variety, is before me from New Cale- 

 donia (Marie). This slender form differs from 0. gracile 

 by its shorter aperture and obliquely drawn-out whorls. The 

 suture is narrowly margined, not crenulate; the striation is 

 fine and delicate, the whorls long, the last two rather flat- 

 tened. The specimen figured measures 7.9 mm. long, 2 wide, 

 with fully 7 whorls. This will probably prove to be a dis- 

 tinct species. There are several narrow species, which need 

 comparison, in the East Indies arid China. 0. pyrgula of 

 Japan has a stronger sculpture. 



Polynesian forms of 0. gracile. In Polynesia I have seen 

 forms of 0. gracile from the Viti, Samoan and Society groups, 

 and from Washington (or New York) island. It has been 



