146 LEPAS. ACORN-SHELL. Class VI. 



GENUS II. LEPAS.* ACORN-SHELL. 



AxiMALj a Triton. 



Sh ELL of several erect unequal valves, fixed by 

 a stem : or sessile. 



1. BALANUS, Lepas. Lin. Syst. 1107. Gm. Common English Barnacle, 



com7non. Lin. 3207- Faun. Suec. No. Ellis Ph. Tr. 1758. tab. 



2122. xxxiv. ^g. 17. 



Lin. Tr. viii. 23. Mont. Test. Br. 6. 



* L. with a shell of six unequal valves, conoid, 

 truncated, sulcated, strong, rough, lid or oper- 

 culum pointed. In this species the points of 

 the four divisions of the opeixulum lie close to- 

 gether, but are not connected, and the trans- 

 verse sti^ice of the upper pair are themselves 

 transversely striated, and the lower pair have 

 each a longitudinal furrow : size, an inch or an 

 inch and half in diameter at the base, and one 

 half or three quarters of an inch at the top ; 

 height from half to one inch and a quarter. 



Found adhering to rocks, oysters, and shell- 

 fish of various sorts. Tab. x\. Jig. 1. 



