HELIX-HADRA. 171 



it becomes flattened on the side and narrowed, and towards the per- 

 istome sharply reflected and constricted below forming a broad deep 

 channel running into the umbilicus ; suture deep, broad ; aperture 

 ovately rounded ; peristome thin, margins much approached, un- 

 connected by a callus deposit, right margin slightly everted, left 

 and columellar margin broadly reflected, arching over the channel 

 running into the umbilicus, formed by the constriction of the last 

 whorl. ( Cox.) 



Alt. "40, greatest diam. '83, lesser *65 inch. 



Wessel Islands, near the north coast of Australia. 



H. wesselensis Cox, Monog. Austr.L. Sk. p. 110, t. 19, f. 4. PFR. 

 Monog. vii. 



H. SARDILABIATA CoX. PI. 34, figS. 8, 9. 



Shell deeply, openly, rather largely umbilicated, orbicularly con- 

 oid, thin, smooth, very finely striated throughout, pale fawn-gray ; 

 whorls 6, gradually increasing in size, the last sharply deflected in 

 front ; aperture oval, margins closely apppoximating, slightly thick- 

 ened and reflexed, and of a polished pink carnelian appearance with- 

 in ; columellar margin triangularly dilated, overhanging the um- 

 bilicus. (Core.) Alt. "80, greater diam. I'lO, lesser '83 inch. 



Mt. Dryander, Port Denison, Queensland. 



H. sardilabiata Cox, P. Z. S. 1871, p. 54, t. 3, f. 3. PFR. Monogr. 

 vii. H. Stephensoniana BRAZIER, P. Z. S. 1871, p. 639. HEDLEY, 

 Proc. Roy. Soc. Queensland, 1889, p. 101. 



" This species is of a fine straw-yellow color on the last whorl, the 

 other whorls being nearly white ; the lip is of a light pink color." 

 (Brazier.) 



H. WHARTONI Cox. PI. 19, figs. 31, 32 ; pi. 33, figs. 68, 69. 



Shell umbilicated, depressed-subglobose, rather thin, yellowish 

 with numerous chestnut spiral lines and bands, a broad one on the 

 border of the umbilicus ; bands visible inside the mouth, continuing 

 to the edge of the lip, which is only narrowly expanded on the 

 outer margin, slightly more on the base, and dilated partly over 

 the umbilicus. 



More depressed than H. appendiculata, the spire low-conoidal ; 

 whorls 6, the last broad, depressed, descending in front. Surface 

 showing under a strong lens an excessively fine close wrinkling, in 

 the direction of lines of growth, visible only on perfectly fresh 



