Three New Species of Teredo 5 
no specimens of 7. portoricensis as late as September 3, 
At San Pedro de Macoris, Santo Domingo, wood sub- 
merged December 1, 1922, contained 20 mm. specimens 
on February 1, 1923, many of them with well-developed 
embryos. 
At San Juan, Porto Riico, wood placed March 20, 
1923, contained on May 30th, 7. portoricensis 40 mm. 
long with embryos. 
At St. Thomas, Virgin Islands, wood placed April 1, 
1923, contained many-30 mm. specimens on June Ist. 
At Coco Solo, Panama, wood submerged December 4, 
1922, contained many 30 mm. specimens on January 19, 
1923, and on February 19th, many specimens with well- 
developed embryos in the gills. 
It can be seen from the above records that this species 
may grow to be 60 mm. in length in a period of two 
months, or at the rate of approximately 1 mm. a day, 
and that specimens with a total tube length of but 20 
mm. may possess well-developed embryos within the 
gills. Its rapid growth and early sexual maturity ren- 
der it one of the species most frequently found in the 
West Indies, and the destruction caused by it is con- 
siderable. 
