17 
TEREDO Arnphisbaena. 
TAB DCXVIII. 
Spec. Char. Valves ; tube very long-, ta- 
pering, tortuose, strong, smooth, composed of 
short segments with concave surfaces. 
Syn. Teredo articulata, M. C.subt. 618. T. an- 
nularis, Rev. G. E. Smith, MSS. Serpula 
Arnphisbaena, Goldfuss, Petr. 239. t. 70. f. 16. 
1 his is nearly of the same diameter as Teredo personala , 
but it is much longer and more tortuose ; at the smaller 
end it generally tapers rather rapidly, and shows but 
little of its articulated appearance. Our description is 
necessarily imperfect, for we have not been able to obtain 
more than the tube, the anterior portion of which is 
inflated (see fig. 1.). 
Found imbedded in flint and chalk, with rarely any 
remains of the wood in which it had been formed. The 
largest specimen figured is from near Rochester, and is 
in Mr. Bowerbank’s cabinet. The specimen in flint is 
