313 



Crassatellites micra, Vorco. 



Crasatella miicra, Verco., Trans. Roy. Soc., S. Aiistr., 1895, 

 vol. xix., p. 93, pi. 1, fig. 3. 



Previously dredged alive in 20 and 22 fathoms ; one has 

 since been taken alive in 16 fathoms, three miles off Tunk 

 Head, and one perfect individual and 11 valves in 62 fathoms 

 north-west of Cape Borda. Valves have been obtained oif 

 Beachport, 10 in 49 fathoms, and 12 in 110. 



Crassatellites probleema, n. sp. PL xxix., tigs. (3, 7. 



Shell transversely-orbicularly oval, solid, projecting ante- 

 riorly. Umbo prominent, incurved, prosogyre, acute. Post- 

 dorsal side roundly sloping ; anterior dorsal side concave near 

 the umbo, then nearly straight, continuing into a 

 well-rounded front side ; ventral border with a uniform 

 open curve, merging into the slope of the posterior side, 

 with an inconspicuous round angulation. The surface is cor- 

 rugated with about twenty solid wide concentric ribs, more 

 projecting at their upper border, wider than their interspaces. 

 For about 2 '5 mm. from the apex the surface is smooth. Inner 

 border simple and smooth. Colour light horn-tint. 



Diin. — Antero-posterior diameter, lO'S mm. ; umbo-ven- 

 tral, 9'4 mm. ; sectional of the two valves, 4*25. 



Locality. — Off Beachport, in 100 fathoms, 2 valves: 150 

 fathoms, 14 valves. 



Diagnosis. — In shape it is very like G. micra, Verco : but 

 this is a much smaller shell, with an equal number of con- 

 centric ribs, and these extend quite up to the apex. It closely 

 approaches G. discus, Hedley, in the smooth area near the 

 umbo, and in the marked concentric ribbing, biit has the front 

 much more produced, and the postero-lateral area not flat or 

 truncated at the border. 



Variations. — In some the angle at the umbo is more acute 

 and in others less than in the type, so that the shell is pro- 

 portionally narrower or wider. In some, especially the wider 

 ones, there is a tendency to slight truncation in the posterior 

 part of the ventral border. 



Lima multicostata, Sowerby. 



Lima multicostata, Sowerby, Thes. Conch., 1847, vol. 1, p. 85, 

 sp. 6, pi. xxii., f. 38. Type locality — ''Mediterranean ( ?)'' 



Reeve's Conch. Icon., 1872, vol. xviii., pi. 1, f. 4; E. A. Smith, 

 Chall. Rep., Zool., vol. xiii., 1885, p. 288; Tate, Trans. Proc. Rov. 

 Soc, S. Anstr.. 1886, vol. ix., p. 108; Tate and Mav, Proc. Linn. 

 Soc, N. S. Wales, 1901, vol. xxvi., part 3, p. 440; Pritchard and 

 Gadiff, Roy. Soc, Vict., 1904, vol. xvii., (N.S.), part 1, p. 259. 



Badula. lima, Tjinne, Angas, Proc. Zool. Soc, Lend., 1865, p. 

 656, No. 91; Ten. Woods, Proc. Roy. Soc, Tasm., 1878, p. 56. 



Lima, lima, Linn, rar. mnltirostaia, Sowerby, Hedley, Mem. 

 Anstr. Mns., vol. iv., 1902, p. 309. 



