MALENTOZOA. SESSILIA. 359 



in twelve pairs ; peduncle short, roundish, rugoso-an- 

 nulate. 



Shell oblong, acuminate, much compressed, with the 

 dorsal outline gibbous, subangulate, formed of thirteen 

 pieces, there being an elongated dorsal, and on each side 

 three small basal, a large ventral, a smaller medial, and 

 an elongated pointed terminal. 



1. Scalpellum vulgar e. Common Lancet-Barnacle. 



Shell oblongo-acuminate, with the ventral outline nearly 

 straight, the dorsal gibboso-angulate ; the anterior basal piece 

 very small, transversely oblong, the middle basal roundish, 

 the posterior basal oblong, longitudinal, recurved, forming a 

 protuberance behind ; the ventral piece subrhomboidal, forming 

 an acute angle above, the medial roundish-oblong, the terminal 

 trigonal, elongated into an acute tip, the dorsal oblong, com- 

 pressed, incurved, with an obtuse keel forming an angular pro- 

 minence beyond its middle. Peduncle short, rugose-annulate. 

 The whole surface sparsely covered with minute short filaments. 

 Cirri much curved, compressed, horny, transparent, with 

 slender straight filaments. 



A single specimen found by me, in the Winter of 1841, 

 attached to a Tubularia, from deep water, off Aberdeen ; 

 anotber in Spring, 1842, by Mr. John Macgillivray ; a third, 

 in October, by Mr. Leslie. 



Lepas Scalpellum. Linn. Syst. Nat. 1109. Lepas Scalpellum. 

 Mont. Test Brit. 18. PL ]. f. 3. Pollicipes Scalpellum. Lamk. 

 Syst. v. 407.; Ed. 2. v. 679. Scalpellum vulgare. Leach. Encycl. 

 Brit. Suppl. iii. 170. 



ORDER II. MALENTOZOA. SESSILIA. 

 Shell conical or cylindrical, affixed without the inter- 

 vention of a fleshy peduncle. 



FAMILY I. BALANINA. 



Animal cylindrical conical, convex, or depressed, sus- 

 pended in a testaceous envelope with the hind part up- 

 permost, and in other respects constructed as in the 

 Lepadina ; but having the branchiae in the form of two 

 fringed laminae attached to the inner surface of the 

 mantle, which is not prolonged to form a peduncle. 



