THREE NEW SPECIES OF TEREDO. 
W. F. Crapp. 
The material from which the following descriptions 
were drawn, was removed from test-blocks of wood 
placed in the water by the Committee on Marine Piling 
Investigations of the National Research Council. For 
descriptions of the test-blocks, and also for notes regard- 
ing the nomenclature used in the descriptions of the 
various characters of the shell and pallets, and for ref- 
erences to recent literature on the subject, consult 
Clapp, 1923, Proc. Bos. Soc. Nat. Hist., vol. 37, no. 2, 
pl. 3-4, p. 31-38, text fig. 1. 
I am deeply indebted to Prof. S. C. Prescott of the 
Massachusetts Institute of Technology, Cambridge, 
Mass., for laboratory facilities and for other assistance. 
