HELTCARION. 181 



species which, according to Hanley and Theobald, is synonymous. 

 Approaches Parmarion very closely. 



H. UNGUICULUS, Morelet. PL 42, figs. 18-20. 



Depressed, convex above, open below, thin, shining, light 

 corneous, lightly striulate, crossed by distant lines, suture 

 margined ; whorls 2, convex, very narrow and membraneous 



below, showing the spire. Diam. 9, alt. 3 mill. 



Cochin China. 



H. APERTUS, Beck. PL 42, fig. 21. 



Much depressed, base open, showing the spire, smooth, sub- 

 opaque, greenish white, spire minute, lateral ; whorls 2^, base 

 very narrow. Diam. 1 1 , alt. 3 mill. Jns LuzQ ^ Philippines . 



H. DIMIDIATUS, Pfr. PL 42, fig. 22. 



Very depressly ovate, open at the base, yellowish horny, spire 

 small, rather flat, lateral, whorls slightly convex, smooth, mem- 



branaceous at margin. Diam. 5*5, alt. 1/3 mill. 



New Zealand. 



H. AUSTRALIS, Reeve. PL 42, fig. 23. 



Ver}' depressly ear-shaped, open at the base, yellowish horny, 

 spire small, rather immersed, whorls impressed at the sutures, 

 faintly arcuately plicately striated, membraneous at the edge. 



Eastern Australia. 



" This, and six other species of the plate, belong to the genus 

 Peltella of Webb and Van Beneden, in which only a section of 

 the whorls is formed ; the base of the shell next the animal is 

 open, or too membranaceous to be preserved " (Reeve). No 

 dimensions are given. The resemblance to Peltella is apparent, 

 but until ?t is ascertained whether the shell possesses a membra- 

 nous base, absent in the figure, its generic position cannot be 

 determined with certainty. 



** Species referred to Austenia by God win- Austen, but which 

 have the form of true Eelicarion. 



H. SALIUS, Benson. PI. 42, figs. 24-26. 



Subglobosely depressed, ovate, very thin, fragile, very shining, 

 pellucid, brownish corneous or light corneous, obsoletely arcu- 

 ately striulate, suture lightly impressed, margined ; whorls 3^. 



Diam. 8, alt. 4 mill. Darjiling, and Teria Ghat, India. 



Godwin-Austen includes this in Austenia, but I see no good 



