1923] Miller: Variations in the Pallets of Teredo navalis 409 



in the recognition of new species in this group until their claims be 

 established on the most incontrovertible evidence. This is especially 

 desirable in view of the facility with which Teredo navalis invades 

 estuarine harbors and is therefore subject to variation resulting from 

 the amplitude of environmental conditions. 



LITERATURE CITED 

 Bartsch, P. 



1921. A new classification of the shipworms, and descriptions of some new 



wood boring mollusks. Proc. Biol. Soe. Wash., 34, 25-32. 



1922. A monograph of the American shipworms. Bull. TJ. S. Nat. Museum, 



122, 51 pp., 37 pis., 1 fig. in text. 



Jeffreys, J. G. 



1869. British conchology (London, Van Voorst), 5, 258 pp., 102 pis. 



Kofoid, C. A. 



1921. The marine borers of the San Francisco Bay region. Report on the 



San Prancisco Bay Marine Piling Survey, 1, 23-61, 36 pis., 1 fig. in 

 text. 



Miller, R. C. 



1922. Variations in the shell of Teredo navalis in San Prancisco Bay. Univ. 



Calif. Publ. Zoo!., 22, 293-328, pis. 13-17, 6 figs, in text. 



