145 



Diminsions. — Anteroposterior diameter, 5*5 ; uinbo-ventral 

 diameter, 5 ; sectional diameter 3 millimetres. 



Locality. — Muddy Creek, lower beds. 



This little species resembles L. Tatei, Angas (P. Z. S., 1878, 

 p. 863;, from St. Yincent Gulf, bat differs in the style of orna- 

 ment, and somewhat in form, being particularly less incurved 

 on the antero-dorsal margin. 



Lucina quadrisulcata, D'Orbigny. 



Reference. — Voy. Amerique meridionale, 1847. 



Synonyms. — L. dent at a, auctores, non Wood ; L. divaricata, 

 auctores, non Linn. ; L. eburnea, Reeve, Icon. Conch., t. 8, 

 f. 49, 1850; L. Ctmingi, A. Adams and Angas, Proc. Zool. Soc, 

 1863, p. 426, t. 27, f. 20. 



The fossil which I have illustrated on Plate xii., f. 3, of Part 

 I., under the name of L. dentata, does not belong to that 

 species, but to L. Cumingi, Adams and Reeve, which in the 

 opinion of Mr. A. H. Cooke (Ann. and Mag. Nat. Hist., Aug., 

 1886, p. 98) is identical with L. quadrisulcata, D'Orbigny. 



This species is the largest of the section Divaricella, is more 

 globose in form than the other species, with the divaricating 

 grooves rather more distant, and not denticulated at the 

 margin. It is found living in Ceylon, South Australia, Tas- 

 mania, Port Jackson, New Zealand, Gulf: of Suez, West 

 Columbia, Panama, and West Indies. 



It is fossilized in the oyster beds of the River Murray Cliffs 

 at the Nor' -West Bend ; also in the Wanganui Series in New 

 Zealand. 



Lucina fabuloides, Tate. 



Reference. — Trans. Roy. Soc, S. Aust., for 1885, t. xii., fig. 5. 



Shell thin, oblong-ovate, compressed ; triangular about the 

 umbones, which are ante-median compressed and slightly 

 curved forwards, but not incurved. Antero-dorsal line much 

 incurved in front of the umbo ; post-dorsal margin nearly 

 straight, sloping at an angle of about 45°, united to the antero- 

 dorsal side by a graceful curve, with a perceptible truncation 

 posteriorly. 



Surface ornamented with sixteen equidistant, erect, thin 

 lamellae, interspaces^concentrically striated ; the lamellae more 

 raised at the front and posterior margins, and the post-dorsal 

 margin is somewhat serrated by them. 



Lunule narrow-lanceolate, concave. 



Dimensions. — Antero-posterior diameter, 9 ; umbo-ventral 

 diameter, 7 millimetres. 



Localities. — Oyster-banks at Blanche Point, Aldinga Bay; 

 and the gastropod bed of the River Murray Cliffs near Morgan. 



This fossil species closely resembles L. spinifera, Montagu, 



