260 



RECENT AND FOSSIL SPECIES OF LEIOPYRGA. 



This genus, founded by Messrs. Adams in 1863, differs from 

 Bankivia by its umbilicus. Two living species, both AustraUan, 

 were described by H. and A. Adams, which remain till now the 

 only representatives of the genus. I have to add one recent 

 species and two from the Older Tertiary of Victoria. 



A synopsis of the specific characters is as follows : — 



Shell smooth ; earlier spire-whorls subquadrate. L. picturata. 



Shell with spiral ribs. 



Ribs on penultimate whorl, three. L. cingulata. 



Ribs four, truncated, equal, equidistant ; suture excavated. 



L. quadricingulata. 

 Ribs three, equal, wavy, with a small one at each suture. 



L. Sayceana, 

 Ribs eight to ten. L. octona, 



Leiopyrga picturata, H. and A. Adams. 



L. picturata, H. and A. Adams, Ann. Mag. Nat. Hist., 1863, 

 p. 19 ; id., Angas, Proc. Zool. Soc, 1865, p. 181 ; 1867, p. 216. 



Bankivia (Leiopyrga) jncturata, E. A. Smith, Zool. Alert, 

 p. 75. 



Trochus (Leiopyrga) picturata, Watson Challenger Gastr., 

 p. 65. 



Cantharidus (Leiopyrga) picturata, Tyron, Man. Conch., vol., 

 xi., p. 140, t. 45, figs. 46-48 (1887). 



Adams' type is from Port Jackson, where the species is well- 

 known ; Angas reported it from St. Vincent-Gulf, but it has not 

 since been collected in South Australian waters. 



Leiopyrga eingulata, A. Adams. 

 Ref. — Proc. Zool. Soc, 1863, p. 507. Cantharidus (Leiopyrga) 

 eingulata. Try on, ojy. cit., p. 141. Port Essington. 



Leiopyrga octona, spec. nov. Plate xl., fig. 5. 



Shell turrited, narrowly perforate, thin, shining, white, with 

 oblique or axial zigzag pinkish lines. 



Whorls eight and a half, moderately convex, separated by a 

 linear suture ; the apical whorls two and a half, turbinately 

 depressed, rufous, smooth. The first two spire-whorls smooth, 

 the third showing faint spiral lines, which increase in strength 

 with the revolution of the spire ; the anterior whorls with about 

 eight to ten equal and equidistant, rounded, and rather depressed 

 cinguli, which are a little wider than the furrows. 



Body-whorl equally and regularly cingulated, base convex ; 

 aperture oval ; outer lip thin, crenated on the margin ; columella 



