366 



MALENTOZOA SESSILIA. 



spaces ; the walls extremely thick, with very large inter- 

 nal radiating cells, divided by strong partitions ; oper- 

 culum quadri valve. 



The species adhere to cetaceous animals. 



1. Cetoptrus balcsTidris. Common Whale-BarnacJe. 



Shell orbicular in its basal outline, subhemispherical, of six 

 united valves, of which the elevated areas are larger, triangu- 

 lar, deeply sulcate, with from three to six obtuse, transversely 

 striated ribs ; the depressed intervals trianguhir, finely striated 

 transversely ; the internal lamina smooth, extending nearly to 

 the base, and forming a cup-shaped cavity with a circular 

 aperture below, and a wider aperture above, in which are four 

 thin, inarticulated valves connected by a membrane ; the pa- 

 rietes of the shell exceedingly thick, with very large cells 

 formed by strong radiating partitions ; the colour yellowish- 

 white. Diameter of an individual an inch and a-half, height 

 eight-twelftlis ; but it attains a much larger size. 



Specimens seen with Mr. Arbuthnot, in Peterhead, in 

 August, 1842; the above description from one in the collec- 

 tion of Andrew Murray, Esq., Advocate, Aberdeen. 



From the skin of a cetaceous animal killed at Peterhead. 



Lepas bdleenaris. Gmel. Syst. Nat. — Cetopirus balaenaris. 



Ranzaire, Mem. di Stor. Nat. 52. — Coronula balaeuaris. Lamk. 



Syst. V. 387 ; Ed. 2. v. 653. — Coronule rayounee. Blainv. Malac. 



PI. 86. f. 3? — Coronula balaenaris. Penny Cyclopaedia. Cirripoda. 



Very large valves of a species of Balanus, agreeing with 

 that named candidus, in having the intervening spaces trans- 

 versely striated, but differing in many respects, are frequently 

 brovight up by the lines from off Aberdeen and Peterhead. I 

 had referred them to Balanus Scoticus; but not having the 

 means of clearing up my doubts respecting them, I must be 

 content with merely indicating their existence. They are re- 

 markably thick, internally cellulo-fistular, externally rugose, 

 generally of a dusky or brown colour. 



