CRUSTACEA 203 



distinguished from the above by its shelly base. 

 Range: Massachusetts to South America in shallow 

 water; extends into brackish and almost fresh 

 water. 



Balanus crenatus Bruguiere 



A white barnacle, usually rougher in appear- 

 ance than B. ebumeus and with a somewhat thinner 

 calcareous base; about 1 inch wide and up to IV2 

 inches high, although usually less. 



Common on rocks and stones from Long Island 

 Sound northward; rare in New Jersey, although 

 occasionally found as far south as Cape May. 



Balanus amphitrite niveus Darwin 



Resembles B. crenatus with which it may easily 

 be confused; it may, however, be differentiated by 

 its smaller size and by the fact that its base is 

 porous, whereas in crenatus it is not, and also by the 

 fact that there is a fairly well marked ridge on the 

 scutum (plate of the shell). Rarely reaches more 

 than % inch in diameter. 



Grows on wood etc. from Cape Cod to Florida. 

 Not common in New Jersev. 



Chelonobia testudinaria Linne (Turtle Barnacle) 



Fig. 34 



A large white barnacle that lives attached to 

 the shells of Sea Turtles. 



