SOME NEW OU NOTEWOKTHY SHELLS — llEULEY. 157 



Xanthomelon marcidum, sp. nov. 

 (Plate xlv., figs. 47, 48, 49, 50). 



Shell solid, deeply lenticular, carinate, spire moderately 

 elevated, base rounded, narrowly perforate. Colour uniform raw 

 umber. Whorls four and a half, gradually increasing, the last 

 suddenly and deeply descending at the aperture. Sculpture : fine 

 irregular oblique growth lines, entire surface roughened by 

 microscopic granules, a well developed keel winds along the 

 periphery of the last whorl and up the spire above th(; suture. 

 Aperture subrhomboidal, very oblique, margins united l)y a 

 callus ridge. Lip expanded, slightly thickened and a little- 

 reflected, especially at the base. Umbilicus deep and narrow, 

 partly covered by the lip. Specimen figured, maj. diam., 17 ; 

 min. diam., 15; height, 10 mm.; another specimen, 19; 15; 

 9 mm. 



The form and sculpture of the shell is considerably modified 

 in dry countries, so that the afiinities of a species is thereby 

 masked. In the present case the shell characters are an insuffi- 

 cient guide to generic classification and its reference to Xantho- 

 melon awaits contradiction or confirmation from anatomical study. 



Hah. — XJabba Range, twelve miles west of Lake Cudgellico, 

 Central New South Wales. One shell from Mr. R. P. Sellois 

 and several from Mr. James Knight. 



Atys palmarum, sp. nov. 

 (Plate xliv., fig. 41). 



Shell small, thin, involute, ovate-truncate, .smooth, glossy, 

 narrowly perforate above and below. Sculpture : three incised 

 lines on the base and two on the shoulder, intervening area 

 smooth. Aperture crescentic, lip angled at base and vertex, 

 columella reflected. Height, 1-5; breadth, 1*2 mm. 



By its inflated form this is related to the typical Atys, such as 

 A. nancum, Linn., from which it differs by size, by the reduction 

 of impressed lines and by absence of fold on lip and columella. 



Hab. — I dredged a few specimens in fifteen fathoms off tlie 

 Palm Islands, Queensland. 



