64 THE LINGULID& OF THE QUEENSLAND COAST. 
is quite distinct from L. hians. Though its proportions 
may approximate those of the latter, the consistency and 
colour of the valves are more suggestive of L. anatina. 
There is usually a very deep green margin and a green tinge 
is common throughout the shell, especially in its anterior 
half. Sometimes a distinct metallic appearance is visible 
on parts of the valves. This has been referred to by Reeve 
as a peculiar coppery redness which assumes in this 
species * a dark, shining, swarthy tone of colour.” This is 
at times very evident in old specimens, especially anteriorly 
and around the margiis, when the green colour then becomes 
much less noticeable. The muscle impressions are very 
obvious. 
L. exusta is the smallest species known from the Queens- 
land coast.. The following is a list of measurements (length, 
breadth and ratio of length to breadth) made by us from 
odd valves: ventral valves—37 mm. by 15 mm. (2.46) ; 
34 by 13.5 (2.52) ; 32 by 13 (2.46) ; 32.5 by 13.5 (2.41) ; 
dorsal valves—31 by 14 (2.21) ; 31 by 13 (2.38). Occasion- 
ally the free margin was the widest portion of the shell. 
There is in the Queensland Museum collection a specimen 
collected by C. J. Wild, at Port Douglas, North Queensland, 
measuring 42 mm. by 19 mm., the ratio being 2.2. It has 
a strongly calcified shell, brownish and greenish in colour, 
with the sides practically parallel. Its general appearance 
agrees sufficiently closely with that of L. exusta, though 
in some points it suggests L. murphiana. 
Owing to the kindness of Professor $8. J. Johnston, 
of the Zoology Department, University, Sydney, we were 
able to examine two specimens of Lingula which Professor 
W. A. Haswell, F.R.S., informed us were given to him in 
1883, by Rev. J. E. Tenison-Woods. The latter said that 
these had been obtained in Port Jackson. They proved 
to be L. exusta. Their measurements were as follows : 
length 37 and 34 mm. ; breadth 14.5 and 14 mm. ; peduncle 
42 and 37 mm. respectively. The ratios of length to breadth 
were thus 2.55 and 2.43. The well calcified valves had a 
slight coppery appearance but were yellowish and greenish 
towards the free end which was slightly widened and bore 
a small but distinctgmedian prominence. They curved 
