208 PEOCEEDINGS OP THE MALACOLOGICAL SOCIETY. 



DESCEIPTIONS OF THEEE NEW SPECIES OF MARINE SHELLS 

 FROM NORTH-WEST AUSTRALIA. 



By Edgar A. Smith, F.Z.S., etc. 



Read 9th December, 1898. 



The specimens now described form part of collections made in 1 890 

 and 1891 by Mr. J. J. Walker, chief engineer of H.M.S. "Penguin," 

 during surveying operations off the north-west coast of Australia. 

 The land-shells collected at the same time have already been reported 

 on in these Proceedings.^ 



1. Makghsteila IValkeei, n.sp. Fig. I. 



Testa ovato-fusiformis, albida, nitida ; spira conica, ad apicem 

 obtusa ; anfractus 5, superiores planiusculi, sutura callosa sejuncti, 

 ultimus elongatus, ad labrum breviter ascendens ; ajDcrtura angusta, 

 longit. totius -^z adsequans ; labrum incrassatum, intus denticulis 

 numerosis munitum ; columella plicis quatuor validis, subsequalibus 

 instructa. Long. 12, diam. 5 mm. 



II. 



Fig. I. Marginella Wallceri', n.sp. 



,, II. Baudinensis, n.sp. 



,, III. Astele ste^iomphala, n.sp. 



^«5.— Baudin Island and Holothuria Banks, North- West Australia 

 (11-34 fathoms). 



The denticles upon the labrum, about twelve in number, do not 

 extend to the top, a fourth of its length being smooth within. The 

 species is remarkable for its narrow fusiform shape and prolonged 

 spire. 



1 Vol. i, pp. 84-99. 



