54 LEPAS. 



LIMPET ACORN. 



25. Lepas patellaris. L. testa sexvalvi, exterius violaceo albo mista, sub- 



tiliter longitudinaliter striata, intus falcata, valvis margine denticu- 



latis. Linn. Gmtl. p. 3213. 

 Shell of six valves; the outside violet mixed with white and finely 



striated lengthways ; inside hooked ; valves toothed at the margin. 

 Balanus patelliformis. B. testa depressa, costis quinis radiatis angulata, 



apertura subpentagona. Brug. Encycl. Meth. Hist. Nat. torn. 6. 



p. 169. 

 Spengl. Schr. Naturf. torn. 1 . pi. 5. f. 4. Chem. Conch. 8. pi. 98. f. 839. 



Encyclop. Method, pi. 165. f. 3. 



This species so strongly resembles the Astrolepas of 

 Argenville, Patella saccharina Linn., that it would be 

 difficult to distinguish it, but for its central aperture. 



It is a compressed cone with six valves, articulated as 

 in the other species, and five prominent angles, forming 

 as it were a pentagonal star. The mouth of the shell 

 is only the tenth part of an inch wide, though the base 

 measures nearly an inch in its greatest diameter. The 

 operculum has not been noticed. The shell is of a 

 brown colour variegated with whitish streaks. 



The specimen which Spengler obtained, and figured, 

 was strongly attached to the branch of a tree from the 

 coast of Coromandel. 



HEMISPHERICAL ACORN. 



26. Lepas hemispherica. L. testa convexa, valvulis sex eequalibus, 



trilobis, operculo convexo quadripartito. 

 Shell convex with six equal three-lobed valves: operculum convex and 



four-parted. 

 Balanus hemisphericus. Brug. Encycl. Meth. Hist. Nat. torn. 6. 



p. 170. Ibid. Art. Vers. pi. 165. f. 4, 5, 6. 



This is a small species described by Bruguiere from 



