‘MESOZOIC FOSSILS FROM THE PALMER RIVER, QUEENSLAND. 153 
_ mouth measures 7} inches in depth by 7 inches in breadth. The 
- siphuncular tube is small, and situated immediately under the back 
_ of the shell. There appears no reason to doubt that the larger 
chambers belong to the smaller whorls, though the connecting por- 
tions are wanting. When complete it is probable the ‘shell 
bles 
only two distant tubercles at the side. _ But there is only one such 
Species of Crioceras or the above C. jackii, Eth., which it fagras 
Fragments of the inner coil can be seen showing 
Ge Preserved, , 
: a sr to be detached, regular, and close, as in the species 
. Mytilus inflatus, Moore, Pl. 10, fig. 7.‘ Shell smooth, slightly 
jneduivalye, curved, both valves inflated, marginsclose set, umbones 
mares, 2 vette, anterior, hinge-line extended and oblique, posterior 
_ tg and front rounded, dorsal surface smooth, with irregule 
_ eheentric bands of growth. This pretty little shell is to be dis- 
Sarin its very inflated , , its more extended 
hinge-line any) ry infla appearance ; 
as above diagnosis corresponds very exactly with two speci- 
that § sont which are, however, more than double the size of 
