288 



Transactions. 



II. A Discussion of the Specific Characters of Lepas anatifera 



Linnaeus. 



Lepas anatifera Linnaeus, 1758. 



1851. Darwin, " Monograph Cirripedia: Lepadidae" p. 73. 

 1905. Gravel, " Cirrhipedes," p. 108. 



1907. Pilsbury, " The Barnacles of the United States National 

 Museum," p. 79. 



This species includes— (1) the general type ; (2) var. (a) punctata 

 Darwin ; (3) var. (b) dentata Darwin ; (4) var. (c), new variety. 



The general type has— (1) a distinct umbonal tooth on the right scutum 

 only ; (2) two well-developed filaments on each side of the body. 



Fig. i. — Lepas anatifera var. (c), new variety. Kermadec Islands (Bell), 1909-10. 



External view, right side. Length of capitulum. 33 mm. ; width of 



capitulum, 21 mm. ; length of peduncle, over 100 mm. 

 Fig. 1". — Maxilla of same specimen, sp., two prominent spines. Length (from top 



to bottom), 2 mm. 

 Fig. \l>. — Mandible of same specimen. Length (from top to bottom) 3 mm 

 Fro. \r, — Opercular valves of same specimen, viewed along occludent margin. 



1 Right scutum; 2 left scutum. 



Var. (a) punctata has, in addition, square patches across the capitulum. 

 Var. (b) dentata has, in addition to the characters of the general type, a 

 strongly barbed carina. Var. (a) has not been collected in the New Zea 

 land region. Th others have 



The main characters of var. (c) need setting down. They are quite 

 definitely as follows : (1) No trace of an umbonal tooth on either scutum ; 



