112 



luniile shallow but well defined, wrinkled and broadly lanceo- 

 late. Transverse long. 13, lat. 11; thickness of both valves 

 united, 8 mill. Not unlike the Tasmanian iV". grayi, Sow., 

 but more tumid and conspicuously sulcate. 



Leda crebrecostata, n.s. Shell minute, depressed, trans- 

 verse, trigonal narrowly oblong, roundly obtuse in front, much 

 punctured, almost angular, and slightly gaping behind, sinus 

 conspicuous — 2 — sub-depressed and conspicuously cut by an 

 angle from which the shell slopes to the margin, whole surface 

 of the valve regularly concentrically marked with equal 

 rounded ribs ; hinge line inconspicuous, and short 

 anterior sub-ligamental area distinct. Transverse long. 5, lat. 

 8, thickness of both valves joined 3. 



The sinus and angle project from the margin of this fossil 

 like a tubercle. Smaller and less rostrate than L. caudata, Don 

 but like it, distinguished by the abrupt angulation of 

 the sinus. There is no European fossil like it in this respect. 



Cardita gracilicostata. n.s. Shell roundly oblong, 

 transverse, inequilateral, oblique, globose, solid, furnished with 

 30 to 34 fine, curved, radiating, finely nodular ribs, which 

 are narrower than the interstices, nodules obsolete to near the 

 centre, whence they become less rounded and more lamellose 

 to the margin, where they are almost spinous, and united to 

 one another by transverse raised lirse, umbones, finely ribbed, 

 acute, oblique, and much incurved, lunule, short cordate, 

 well defined and deep, hinge area much overlapping the hollow 

 of the umbones, hinge with one central tubercular, rounded 

 tooth, round which the laterals make a complete arch, much 

 thickened posteriorly. Margins coarsely crenulate. Long, 

 from umbo 27. Transverse lat. 31. Alt. of both valves 

 14 mil. 



Lima bassii. n.s. Shell oblong, subquadrate, rather 

 solid, somewhat tumid, radiately and squamosely ribbed, 

 margin full, and equally rounded with a prolonged curve ; 

 anterior side short, and very slightly concave, almost mar- 

 gined through its whole extent by a small, narrow, obtusely 

 angled auricle, which has three small rough ribs, and is 

 deeply striate near the umbo, posterior side without auricle, 

 truncated with a straight, sloping line deeply impressed with 

 fossa towards the interior ; ribs 22 in number, radiating regu- 

 larly, divided at equal intervals by long arched, raised 

 squamse, etc., umbo acute and only slightly curved. Length 

 from umbo to margin 27. Lat. 22 mil. 



Very distinct from any Australian congener by the absence 

 of the auricle and the straight posterior side, though the form 

 closely approximates to the sp. L. sriuamsa, now living in the 

 Eed Sea and Mediterranean. 



