299 



and Limnoria. The rate of growth under normal ronditions at this locality appears to 

 be from 3 to 5 cm. a month during the first five months, at the end of which time the 

 blocks were usually so crowded as to hinder or stop further growth. A burrow 18.5 

 cm. in length occurred in a block submerged five months at the United States Navy- 



Fig. 119. Sample of 12" x 12" timber submerged 10 months in Pearl Harbor. Split surface showing 

 damage by Teredo parksi and Martesia striata, the latter organisms still in place in burrows. 



{Photo by courtesy of Public Works Dept., U. S. Naval Station, Hawaii.) 



Coaling Plant, and a burrow 22.5 cm. long was found in a block submerged at Kuahua 

 Island, these being the maximum lengths recorded. 



This species is incubatory, and in Samoan w^aters becomes se.xually mature 

 within a few weeks after entering the wood. Specimens containing well developed 

 larvae in the gills were found in blocks submerged only two months at Tutuila. Potts 

 (1923) reports that rafts in the water only twenty-four days in Pago- Pago Harbor 



