MORSE: OBSERVATIONS ON LAMELLIBRANCHS. 
156 
MODIOLA PLICATULA I-aiiuirrk. 
Fig. 12. Length, 74 mm. 
The anal syphon with small opening apparently represents 
the valve; the branchial syphon is ropropented by the mantle 
Fig. 12. — Modiola plicatula Lamarck. 
thrown into light folds, reddish brown in color flecked with white 
dots. Minute folds in the mantle correspond with the ribs of 
the shell. 
MODIOLARIA DISCORS (Linn6). 
Fig. 13. Length, 30 mm. 
Anal syphon large with broad base narrowing to a small open- 
ing; branchial syphon represented by the mantle united below 
Fig. 13. — Modiolaria discors (Linn6). 
the anal syphon and dropping down in numerous folds, extremely 
mobile, brown in color, mottled with reddish brown spots, 
very long and slender. 
Foot 
