BY C. HEDLEY. 209 



seen these Antarctic forms, but judge from the account quoted 

 that they closely resemble Philohrya, but differ by the presence 

 of two adductor muscles and the absence of the dish-shaped pro- 

 toconch. Rather than suggest a fresh generic name for our pair 

 of uncapped Australian species, I propose to lodge them for the 

 present in Philipinella. 



Teeebratulina radula, n.sp. 

 (Plate X., figs. 48-50.) 



Shell minute^ longer than wide, elongate-ovate, not flexed in 

 front. Colour dull white. Beak produced, distally gouged out 

 to meet a large and incomplete foramen which is margined 

 laterally by small deltidial plates. Ventral valve shallower and 

 much shorter than the dorsal, with auricles somewhat like Lima 

 hullata; a juvenile growth-stage is well defined on its apex. Both 

 valves are sculptured by about a dozen bold, radiating granose 

 ribs, which denticulate the ventral margin and are parted by 

 broad, trench-like interstices, the latter roughened by finer grains. 

 On each side these ribs gradually fade away. The auricles of the 

 ventral valve are transversely wrinkled. Loop traj^ezoidal, com- 

 plete, with a returning point on the shorter side. Length 2*95;. 

 height 3 '85; breadth of conjoined valves 2 mm. 



Hah. — Sixteen miles east of Wollongong, in 100 fathoms; three 

 specimens taken by Mr. G. H. Halligan and myself. 



Type. — To be presented to the Australian Museum, 



From the well developed loop, I regard the individual figured 

 as adult, in which case it is probably the smallest of the genus 

 known. It is also easily distinguished from co-generic forms by 

 the bold, radiating sculpture. Young specimens, one-third the 

 size of the type, with undeveloped loop, differ in contour. These 

 are broader in proportion to their length, and have a general 

 resemblance to Eucalathis murrayi, Davidson. 



The Tertiary fossil Terehratuli7ia scoulari, Tate, has a general 

 likeness to our species. 

 U 



