BY T. HARVEY JOHNSTON AND OTTO S. HIRSCHFELD. ODL 
by him are length 2 inches 2 lines and breadth 1 inch 5 
lines—the ratio thus being 1.53. These dimensions agree 
with his fig. 14 (Philippine specimen—Sowerby’s figure) 
which shows a ratio of 1.6. The ‘* Moreton Bay ”’ shell 
figured measures about 2.2 inches but owing to distortion, 
the true breadth cannot be measured. but the figure gives 
a ratio of about 1.6 In Reeve’s original account (1841, 
184la) the sizes are given as 2.1 inches by 1.3, the ratio 
thus being 1.6. 
In the Queensland Museum there are a few specimens of 
L. tumidula collected by Mr. C. Hedley in the Boyne River 
(Port Curtis)* and by Miss 8. Lovell at Frazer Island (Great 
Sandy Island), Harvey Bay. 
The species is characterised by the possession of large 
thin, horny, scarcely calcified shells whose edges (especially 
laterally) become curled dorsally as a result of drying7, 
such dried distorted specimens resembling Davidson’s 
figure (1888, pl. 28, fig. 16—from Reeve 1859, pl. 1, fig. 2b). 
The colour of the Museum specimens is a dark brownish 
red with very distinct black lines of growth. Reeve stated 
that it was burnt olive red (1841). Davidson mentioned 
that the colour was coppery brown or reddish blue, some- 
times bright green near the posterior margin. We suspect 
that he was referring to a Philippine form, since Sowerby’s 
figure shows a brown colouration with a well defined green 
band along the margin of the free extremity of the shell. 
The lines of growth on our specimens are much more like 
those figured by Davidson for L. adamsi (pl. 28, fig. 19) 
than those figured for L. tumidula (fig. 14). 
The umbones are distinct, though small, when the valves 
are fairly well preserved, but in most of the specimens ex- 
amined by us they were scarcely recognisable. The least 
distorted of the few paired valves available measured 46 
by 30.5 mm. the ratio of length to breadth thus being 1.51. 
*Mr. Hedley has informed us that he found the specimen dead at low 
tide on the beach at Boyne Island, immediately north of the mouth of 
the Boyne River, Port Curtis. 
+Reeve in his original description (1841) mentioned the irregularly 
reflexed margin as being a character of the species. 
