SIO 



Lima bassi, Tenison-Woods. 



1S77. Lima bassii, Tenison-'Woods, Pap. Roy. Soc. Tas. 1876, p. 112. 

 1886. Lima bassii, Tate, Trans. Eoy. Soc. South Aust. vol. viii. p. 117, 



pi. V. tig. 8; pi. viii. fig. 1. 

 1893. Lima bassii, Tate and Dennant, id. vol. xvii. pt. 1, p. 224. 



1895. Lima bassii, Tate and Dennant, id. vol. xix. pt. 1, p. 112. 



1896. Lima bassii, Pritchard, Proc. Roy. Soc. Vict. vol. viii. n.s. p. 128. 



This common shell of the Australian and Tasmanian Tertiary 

 is oblique, compressed, and rather thin ; the radiating costae are 

 distant, large, rounded, occasionally imbricated, scale-like ex- 

 pansions of the growth - lines, forming semilunate projections, 

 which are usually more numerous at the sides than near the 

 umbones and the middle of the shell ; area short, broad ; ligament 

 pit triangular, large, shallow ; auricles small ; dorsal surface 

 slightly concave. It is closely allied to L. color ata and Z. zea- 

 landica, but is not so solid, whilst the scales on the radiating 

 costse are distinctive. 



Dimensions. — Height 41 mm. ; length 31 mm. 



Form, and Loc. — Eocene : Muddy Creek, Victoria. 



L. 4820. Specimen of the right valve, having very numerous 

 radiating costae, which possess but few scale-like projections. 



Presented hy John Dennant, Esq. 



L. 6587. Two examples, in one of which the scales rise 

 prominently into hollow, dome-shaped projections. Purchased. 



L. 9840. Series illustrating stages of growth, and the extreme 

 variability in regard to number, size, and shape of costae. Purchased. 



Lima linguliformis, Tate. 



1886. Lima linguliformis, Tate, Trans. Roy. Soc. South Aust. vol. viii. 

 p. 118, pi. iii. figs. \a-b. 



Shell fragile, much smaller than L. bassi, and having minute 

 undulating costae ; these latter, as in L. scahra, Born, diverge from 

 a median line extending from the umbo to the ventral margin, 

 where they become somewhat granose ; the frequent and closely-set 

 lines of growth divide the costae into short lengths. The valves 

 are almost equilateral ; anterior auricle prominent, posterior 

 obsolete. 



Dimensions. — Height 18 mm. ; length 13 mm. 



