330 RECORDS OF THE AUSTRALIAN MUSEUM. 



TONNA AMPDLLACEA, PhiUp^i. 



(Plate xliv., fig. 7.) 



Didinni Kiiiptillaceiuii, Philippi, Zeitsclii'. uuilak., ii., l845, p. It?. /(/., 

 Philippi, Abbild. Besclir., iii., 1849, p. 11, pi. ii. /(/., Kuster, Coiicli. 

 Cab., 1857, p. 68, pi. Ix. /(/., Hauley, Proc. Zool. Soc, 1859, p. 4-91. 

 hi, Duuker, Novitat. Couch. Mar., 1867, p. 105. 



Tiyon has reduced this to a synouym of T. costahi, but the larger size, 

 simple lip and intermediate i-iblet of T. anipuUdcen seem to me to support 

 Philippi's judgment of its independence. I cannot find that a definite 

 locality has ever been recorded t'oi- this rare species. So the following 

 record of an imperfect example 130 mm. in length obtained by Messrs. 

 .T. W. Christie and Godfrey, is of interest. 



Luc. — Point Charles, Port Darwin, Northern Territory (rare). 



ToNNA CKREVISIXA, /'. ^p. 



(Plates xxxix-.xli., figs. l-;>.) 



Doliinii rariejatuiii, Reeve, Conch. Icon., v., 1849, pi. v., fig. 7a. Id., 

 Augas, Proc. Zool. Soc, 1867, p. 197. /(/., von Martens, Forsch. 

 Cazelle, iii., 1889, p. 263. Jd., Melvill & Standen, Journ. Linn. Soc, 

 Zool., x.wii., 1899,. p. 164. Id., Roth, Bull. N. Queen.sland Ethno- 

 graphv, iii., 1901, p. 18. /'/., Hedley, Mem. Austr. Mus., iv., 1903, 

 p. 341. 



Tonna variegata, Hedley, Proc. Linn. Soc. N.S.Wales, xxxii., 1907, p. 483 

 (not Doliuiu variecjidniii, Lamarck). 



Shell globose, of great size but comparatively light and thin. Whorls 

 five plus a turbinate, horny protoconch of three whorls. 



Colour. — The young shell is buff or cream, often with three or four pale 

 bands each as bi^oad as one or two of the ribs, large dashes of burnt sienna 

 are irregularh* disposed, they are restricted to the palei- bands and do not 

 transgress from the rib to the gi-oove, these spots vary in number and 

 distribution, being most fi-equent on the spire, on the side of the shell the 

 spots may be crowded till spaced by their own Avidth, or they may be 

 scattered at the I'ate of four or five to a whorl, they become more rare in 

 the adult, which on a buff ground is usually streaked and clouded with 

 .sliades of chocolate and cinnamon. The epidermis is thin, membranous 

 and rather persistent. 



The ribs are seventeen to twenty in number, the topmost usually 

 double, six ribs continue on the spire, and genei-ally the ribs are broad 

 and flat- topped with narrow interstices, exceptionally the ribs are nairower 

 and more round-backed and are then parted by gi'ooves as wide as the ribs ; 

 sometimes the ribs are obliquely malleated. 



Aperture ample, semi-lunate ; outer lip simple ; inner lip a thin smear 

 of callus. Interior corrugated by the impress of the exteriial ribbing, 

 hazel or rufous in colour. Columella twisted above, per])en(licular bi'low, 

 bi'oadly reflected ovej-a wide spiral umbilicus, beyond which is a j)roiiiinent 

 funicle. Canal shoif, up-turned with a wide, oblique, U-shaped notch. 



