377 



DESCRIPTIONS OF NEW TROCHOID SHELLS FROM NORTH 

 QUEENSLAND. 



By H. B. Pkesxon, F.Z.S. 



Read Wth June, 1909. 



Leptothyra crassiliuata, n.sp. 

 Shell somewhat globosely turbinate, solid, dark purplish-red ; 

 whorls 4J, sculptured throughout with coarse, rather broad lirte '• 

 sutures impressed; columella descending in a veiy oblique curve* 

 peristome acute; aperture subcircular; operculum unknown. Alt. 7*25 

 diam. maj. 7"5mm. ; aperture, alt. 4, diam. 3 mm. 



Hah. — JS'orth Queensland. 



As the present shell has all the appearance of that of a Leptothyra, 

 I have placed it provisionally in that genus, notwithstanding the 

 fact that the operculum is unknown. In many respects it resembles 

 L. sanguinea, Linn., but is easily separable from that species by the 

 much coarser basal sculpture. 



GiBBULA DaCOSTANA, H.Sp. 



Shell perforate, turbinate, moderately solid, blackish bronze, 

 tesselated with cream colour, and flecked and spotted, especially on 

 the base, with the same colour, alternating with rusty red ; whorls 5^, 

 rather coarsely spirally Urate, the interstices between the lirae bearing 

 two fine spiral striae; sutures impressed; umbilicus narrow, deep, 



the umbilical region being somewhat lighter in colour than the 

 rest of the shell ; columella curved ; peristome iridescent bluish green, 

 minutely dentate throughout, the margins joined by a thickish 

 pearly callus ; aperture subquadrate ; operculum horny, multispiral. 

 Alt. 8, diam. maj. 8 mm. ; aperture, alt. 4*25, diam. 3"25 mm. 

 Hah. — N'orth Queensland. 



VOL. VIII. — SErTEMHER, 1909, 29 



