312 



fathoms, the largest beiug 25 mm. antero-posteiiorly, and 20 

 mm. umbo-ventrally. Tate, in his original diagnosis, re- 

 marked : "This species is very like C. aurora and G . Banksii, 

 Adams and Angas, inhabiting Bass Straits, with regard to 

 colour, ornament, and crenated margin of valves. It is, how- 

 ever, of a different form, is as widely removed from G . aurora 

 as that species is from G. Bankaii; thus, G. Banksii is oblong- 

 ovate, G. aurora transversely ovate, and G. carnea is more 

 rotund. They may eventually prove to be variations in shape 

 of an aggregate species." 



The proportion of length to height in G . aurora, is 24 to 

 17, or as 100 to 71. That of Tate's type is 22 to 19, or 100 

 to 86*8. That of my largest is 25 to 20, or 100 to 80. There 

 fore my largest shell approximates somewhat more to the 

 type of G. aurora than does Tate's type of G . carnea, but is 

 still much shorter; and as my larger shell is larger than 

 Angas's type, and is nevertheless shorter, and is an old stout 

 shell, the difference is not explained by the senility of Angas's 

 shell. G. carnea may consequently be retained for the pre- 

 sent as a distinct species. 



Crassatellites banksii, Adams and Angas, 'lar. angustior ; 



n. var. 



Crassatella hanhsii, Adams and Angas, Proc. Zool. Sec, 

 Lend., 1863, p. 427, pi. xxxvii., fig. 16. Type locality — Banks 

 Straits. Conch. Cab. Kuster, 1886, bd. x., abt. i., p. 26, pi. vii., 

 f. 14. 



In 55 fathoms north-west of Cape Borda I dredged 16 

 small and 33 large valves of a species which corresponds with 

 G. Banksii in its oblong-ovate shape and truncated posterior 

 end and colouring. Its dimensions, however, do not corres- 

 pond. It is narrower antero-posteriorly for the same height. 

 G. banksii is 16 mm. long by 10 high; mine are 12 mm. long 

 by 10*2 high — hence the name angustior. My largest specimen 

 is 23 mm. by 20*5 . To be in proportion it should be 32*8 mm. 

 long instead of 23. I have preferred to call it a variety rather 

 than create another species based on this one difference. It 

 has not occurred elsewhere in my dredging. 



Crassatellites producta, Verco. 



Crassatella producta, n. sp., Trans. Boy. See, S. Austr., 1895, 

 vol. xix., p. 92, pi. 1., f. 2. 



Fifty valves were dredged off Cape Borda in 55 fathoms, in 

 very good condition. Beyond this depth in the same neigh- 

 bourhood at 60 and 62 fathoms; off the Neptunes, in 104 fa- 

 thoms; and off Beachport, in 110 fathoms; from one to six 

 valves in poor preservation were obtained, and none beyond. 

 Its habitat is probably from 15 to 20 fathoms, up to 50. 



