884 



Dimensions. — Height 5 5 mm. ; length 11-5 mm. 



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



L. 9834. Examples of both valves. Purchased. 



Eamily PHOLADIDiE. 



Genus BARNEA, Leach. 



[/w Risso, Hist. Nat. Eur. Merid. t. iv. 1826, p. 376.] 



Shell not gaping anteriorly, and having a single, lanceolate 

 dorsal plate. 



Type. — Barnea spinosa, Risso. 



Baruea tiara, Tate. 



1887. Barnea tiara, Tate, Trans. Roy. Soc. South Aust. vol. ix. p. 182, 

 pi. xviii. figs. \a-c. 



Shell narrowly elongate, inequilateral, attenuated at both ends ; 

 post-dorsal area very precipitous and concave behind the umbo ; 

 surface ornamented with concentric ridges, which are angulate 

 on the medial and anterior areas, where they are crossed by 

 radiating threads, being subspinose at the points of intersection ; 

 interstitial spaces concentrically striated ; the surface of the 

 posterior half of the shell is granulated. The author remarks 

 that the dorsal plate (which is fragmentary in the Museum 

 specimens) is "narrowly oblong, rounded at the front, the Tcry 

 short posterior side is bent down at right angles, roundly truncated 

 and medially insinuated at the end. The anterior portion of 

 the plate has a wide, shallow median depression, bounded by 

 an obtuse ridge on each, radiating from the umbo, the whole 

 crossed by closely-set sharply-arched lamellae ; the narrow lanceo- 

 late depressed marginal areas exterior to the umbonal ridges are 

 granulated." 



Dimensions. — Height 15 mm. ; length 39 mm. 



Form, atid Loc. — Miocene : Muddy Creek, Victoria. 



L. 6615. Perfect examples of both valves, but the post-dorsal 

 plate is missing. Purchased. 



L. 9829. Imperfect right valves, and large part of a post- 

 dorsal plate. Purchased, 



