1922.) Bivalve Molluscs injuring Brickwork. 557 
Martesia fluminalis Bianford. 
1868. Martesia fluminalis, Blanford, Journ. As. Soc. 
Bengal XXXVI (2), p. 67, pl. XIV, figs. 1-3. 
Specimens from the docks are much larger than Blanford’s 
type-series and exhibit great individual variability in shape. 
Their surface is also very irregular and often much eroded, 
15 mm. to a little over 2:5. That of height to thickness 
is much more constant. The difference lies mainly in the 
elongation of the siphonal region in some specimens and 
its brevity in others. The periostracum, where it has not 
perished, is very thick and of a dark brown colour. 
Modiola striatula Hanley. 
1916. Modiola striatula, Annandale & Kemp. Mem. Ind. 
V, p. 360, pl. XV, figs. 7-18; pl. XVI, 
A single small living shell of straight elongate type and 
with the longitudinal striae well developed was found anchored 
hy its byssus in an empty Mariesia burrow. 
7 ne er ee eee eee 
