96 Proceedings of the Royal Society of Victo7'ia. 



oblonga, T. Woods, from the Eocene beds of Table Cape^ 

 Tasmania, it may be noted that T. Woods' species is propor- 

 tionately longer and of much more uniform breadth, is a more 

 depressed shell witii a more incurved umbo, and still finer and 

 closer umbonal corrugations, numbering (15) fifteen in the first 4 

 millimetres of the beak. With the recent species there is also 

 another analogy of some interest, in that a species of Myochama. 

 is not infrequently found adherent to the shell, the present fossil 

 species has Myochama plana, Tate, adherent to it. 



Crassatellites camupus, sp. nov. (Plate XIV., Figs. 5-9). 



Description. — Shell ovate, thick and solid, of medium size,, 

 with a very short anterior, and a somewhat attenuate posterior;, 

 strong, broad, and prominent umbos medially depressed. Slightly 

 concave anterior to the beaks, slightly to deeply concave posterior 

 to the beaks, ventral margin very slightly convex, medial portion 

 usually straight. Umbos strongly incurved and rather coarsely 

 corrugated, the first 4 millimetres of the beak bearing from 8 ta 

 10 corrugations, the umbonal region rapidly broadens and 

 becomes depressed. Umbo-post-ventral keel only moderately 

 developed and convexly rounded. 



The surface shows fine but irregular concentric lines of growth, 

 with occasional irregular undulations, from a little less than 

 half the umbo-ventral diameter of the shell to about one-third 

 of the same the more regular corrugations make their appear- 

 ance, and here they are about a millimetre apart, with broad 

 shallow interspaces. Internal edge of shell smooth and bevelled 

 off sharp. Young examples of this species are rather more 

 wedge-shaped posteriorly tlian in the adult. 



Dimensions. — Type specimens, left valve, antero-posterior 

 diameter, 54 mm.; umbo-ventral diameter, 41 mm.; depth 

 through the one valve, 14 mm.: right valve, antero-posterior 

 diameter, 55 mm.; umbo-ventral diameter, 37 mm.; depth, 12 

 ram. The following antero-posterior and umbo-ventral diameters- 

 will .serve to indicate the usual range and average variations : — 

 64 by 42 ; 61 by 43 ; 60 by 40 ; 54 by 37 ; 52 by 36 ; 31 by 21 ; 

 25 by 18; 21 by 16; 13 by 10. 



Localiiies. — GY?Lnf^e Burn, between Forsyth's and Henty's, and 



