60 THE LINGULIDE OF THE QUEENSLAND COAST. 
23 (2.22); 50 by 22 (2.27).* Through the kindness of 
Professor Sir Baldwin Spencer F.R.S., we were able to 
examine two specimens in the Melbourne University 
collection (locality, ?Brisbane), measuring 58 mm. by 
25 mm. (ratio 2.32), and 50 by 21 mm. (ratio 2.38) respect - 
ively. Davidson mentioned as sizes 2 inches 6 lines 
by. l inch 1 line, the ratio being 2.3. The ratio 
of all measured specimens is then practically constant 
being between 2.1 and 2.3. JL. anatina has much the same 
viz. 2.2, but as already mentioned, its valves are less strongly 
calcified and do not attain to the same length and breadth,, 
while the outline is not so square at the free extremity. 
The valves of L. murphiana are strongly calcified, 
relatively thick and practically opaque. Even after pro- 
longed treatment (for several weeks) in 5 per cent. acid 
alcohol, they do not lose their form as a result of subsequent 
drying, whereas the shell of L. bancrofti does under such 
conditions. The rectangular outline has been already re- 
ferred to and is well illustrated by Davidson. The entire 
animal is comparatively thick and a transverse section 
shows a more or less elliptical outline, there being no 
depressed area on each side of the mid region of each valve. 
A considerable overlap of the dorsal valve by the ventral 
was commonly noticed, the amount being about two 
millimetres. 
The deltidial region is very well developed and the 
muscle scars quite prominent, the median ridge being welt 
marked especially on the dorsal valve. This was noted by 
Davidson (1888, p. 211) who published excellent figures 
showing the inner faces of the valves (pl. 30, figs. 1-3). 
The projecting point shown in his figure (pl. 30, fig. 1) is 
fairly characteristic, though not usually as sharply marked 
as indicated therein. It is best seen on the dorsal valve. 
The shell occasionally gapes slightly. The colouration 
has been noted by Reeve and Davidson. We found, how 
ever, that the amount of green present varied, but that 
the coppery red tint predominated and was often blotehy. 
*There is also a specimen (?locality) measuring 43.5 by 20 mm. (ratio 
2.17) which may belong to L. murphiana but we are inclined to regard it 
as DL. exusta. 
