Class VI. LEPAS. ACORN-SHELL. 149 



the six depressed are greyish, and striated 

 across ; as large as a walnut. 



Found frequently adhering to the bottom of 

 ships, in great clusters. Probably originated 

 in hot climates. 



Lin. Tr. via. 25. Mont. Test. Br. 8. id. Sup. 1. 8. rugosa. 



* L. with a shell somewhat cylindrical, lids 

 sharp pointed, length three quarters of an inch. 

 Dorsetshire coast. 



Gm. Lin. 3213. 



Bal. clavatus. Mont. Test. Br. 



9. ELON- 



Lin. Tr. viii. 26. 



10. 



GATA. 



* L. with an elongated club-shaped shell ; aper- 

 ture diverging, operculum obtuse. The parti- 

 cular characters of this species are its extraor- 

 dinary height (those found on the coast of 

 Anglesey measuring full one inch and three 

 quarters), and its invariably wide-gaping aper- 

 ture, the reverse of all the other species : is 

 from two tenths to a quarter of an inch broad ; 

 the operculum is precisely of the same struc- 

 ture with that of L. balcmoides, unless the stride, 

 which cross the upper divisions of the opercu- 

 lum, assume more of the form of laminae, and 

 have in a great measure the appearance of being 

 imbricated. Tab. xl. Jig. 4. 



