124 RECORDS OF THE AUSTRALIAN MUSEUM. 



Reeve, L. columnarius lacks colour, has a more prominent mucro, 

 longer and more arched valves, the granules are sharper and 

 their radial arrangement more distinct. 



*» v 



Glycvmeris sordida, Tate. 



Pectunculus sordidus, Tate, Trans. Roy. Soc, S. Austr., xiv., 

 1891, p. 264, pi. xi. f. 8. Glycymeris sordida, Verco., loc. cit. y 

 xxxi., 1907, p. 227. 



This shell appeared plentifully as worn and separate valves. It 

 had not been seen before either in Tasmanian waters or on the 

 Pacific coast. G. insignis 10 is probably a synonym. 



Cuna compressa, sp.nov. 



(Plate xxiv., figs. 29, 30, 31, 32). 



Shell rather large for the genus, ovate truncate, the anterior 

 and dorsal margins forming a right angle, solid, very shallow 

 lunule and escutcheon both narrow and inconspicuous. Colour 

 dull white. Sculpture : irregularly furrowed by growth inter- 

 ruptions, and rayed by about twenty half obliterated riblets, 

 which do not extend over the anterior and posterior extremities. 

 Prodissoconch, a smooth well defined dome, followed by a step. 

 Inner ventral margin denticulated by twenty small tubercles and 

 sockets. Length, 9'2 ; height, 8 - 6 ; depth of single valve, 2 mm. 



One of the largest of the genus. Our dredging showed it to be 

 a common shell off Cape Pillar, as Dr. J. C. Verco had previously 

 found it to be in forty fathoms off Beachport, South Australia. 



Cuna hamata, sp.nov. 



(Plate xxv., figs. 33, 34, 35, 36). 



Shell solid, rather inflated, spiral-ovate, hooked above, lunule 

 faint, escutcheon evanescent. Colour dull white. Sculpture: 

 surface roughened by irregular concentric growth lines, radials 

 wanting. Umbo spirally produced, directed ventrally. Inner 

 ventral margin beset with about thirty small tubercles. Height, 

 5 ; length, 4; depth of single valve, 15 mm.~^ 



At the scene of our investigations this is an abundant species. 

 The "comma"' shape distinguishes it readily from the rest of the 



10 l'ilsbry— Proc. Acad. Nat. Sci. Philadel., 1906, p. 231 



