14 Trans. Acad. Sct. of St. Louts 
than in T. johnsoni or T. clappi. The shell is smaller, no 
specimens having been found exceeding 3.5 mm. im 
length or height. 
The pallets differ greatly from those of any previously 
described species, so much so, that, were it not for the 
lack of any trace of a true internal shelf, I should not 
feel certain that the species belong in the subgenus Zopo- 
teredo. The most striking character of the pallet is the 
milk-white color of the blade through almost its entire 
length. This is in marked contrast to the other species 
of Zopoteredo, in all of which a large portion of the 
blade of the pallet is covered with a dark colored perios- 
tracum. The long, narrow sinus being only on the ex- 
ternal face of the blade, the distal end is not double- 
cupped as in Teredo johnsoni. 
This species is probably extremely rare, for it has been 
found in the numerous test-boards placed by the Com- 
mittee on Marine Piling Investigations throughout the 
West Indies, only at Port au Prince, Haiti, and Chris- 
tiansted, St. Croix, Virgin Islands. At the first named 
locality no specimen of this species occurred in test- 
blocks which were submerged from December 1, 1922, 
until June 1, 1923. These blocks were, however, well 
filled with several other species of shipworms. In a 
series of test-blocks submerged June 1, 1923, one of 
which was removed and examined each month until 
October Ist, all contained numerous specimens of several 
species of shipworms, but only the block which had been 
submerged two months, having been removed ‘August 1st, 
contained specimens of J’. fulleri. Of seventy-five ship- 
worms found in this block, only five belonged to this 
species, the largest with a tube 30 mm. long. 
At Christiansted, test-blocks submerged September 15, 
1922, and removed bi-monthly contained many ship- 
