258 PROCEEDINGS OF THE ACADEMY OF [1899. 



A NEW AUSTRALIAN EULIMA. 

 BY HENRY A. PILSBRY. 



The group Lambertia, reckoned by Try on and Fischer a sub- 

 genus of Eidima, was instituted by Souverbie for a peculiar pupi- 

 form Eulimid with mucronate apex, from New Caledonia. Only 

 one species has been described, so far as I know; but in a sending 

 of shells from Port Stephens, N. S. W., from Dr. J. C. Cox, 

 another form referable to the same group occurred. As the name 

 Lambertia had already been used in zoology when Souverbie 

 wrote (by Robineau-Desvoidy in Diptera, 1863), I would propose 

 the name Hypermastus for the species described below, the new 

 group probably including Souverbie' s New Caledonian form also. 

 It is clearly distinct from Mucronalia. 

 Eulima (Hypermastus) Coxi n. sp. PL XI, figs. 3, 4. 



Shell small, pupiform-cylindrical, glossy; translucent white, with 

 an opaque-white band midway between the sutures, spreading 

 downward; spire convexly tapering, slightly so for the greater 

 part of its length, but more suddenly above, leaving the initial 

 whorl projecting like a mucro or teat, which is tilted or oblique. 

 Whorls five (exclusive of the apical mucro), not in the least 

 impressed at the sutures, the suture slightly ascending and then 

 deflexed at the aperture; base tapering. Aperture semioval, 

 acuminate above; peristome bending forward a little below, some- 

 what inflexed above; columella concave, passing without angle into 

 the parietal margin, which bears a thin callus. 



Length 4, greatest diameter 1.43, length of aperture 1.4 mm.; 

 diameter of apical " button " .15 mm. 



Port Stephens, New South Wales, Australia, collected by Dr. J. 

 C. Cox. Type is No. 71,306 coll. A. N. S. P. 



The general contour differs considerably from that of Lambertia 

 Montrouzieri Souv., which is moreover a far larger species. The 

 surface is unbroken by varices, and the white line running midway 

 of the whorls looks deceptively like the suture. Mr. Charles 

 Hedley, the malacologist of the Australian Museum, tells me that 

 he knows of no description of an Australian Eulima resembling 

 this one. 



I am indebted to Mr. Vanatta for camera hicida drawings, which 

 show the form of the shell better than any description. 



