358 MALENTOZOA. PEDUNCULATA. 



linear, arcuate, carinate, plain or denticulate, with the sides 

 flattened and sulcate, the base enlarged, incurvate, and emar- 

 ginate ; the pedvincle short, soft, rugose, grey, brown, or red, 

 the connecting membranes of the valves yellowish-red. Length 

 of the shell in the largest specimen nine-twelfths, breadth 

 six-twelfths and a-half ; but it attains a larger size. 



The above description from numerous recent specimens found 

 by myself adhering to a piece of cork on the sands near Aber- 

 deen, on the 3d March, 1843 ; two days before which, several 

 small specimens adhering to a cork net-float, found in the 

 same place^ were presented to me by Mr. Alexander Beaton, 

 who is therefore the discoverer. 



There seems no very decided reason for supposing this to 

 be Lepas anserifera of Linnaeus, which he represents as " se- 

 mine Lini minor :" I prefer Lamarck's name. 



Lepas anserifera. Mont. Test. Brit. 16. — Anatifa striata. Lamk, 

 Syst. Ed. 2. V.676. 



3. Lepas sulcata. Grooved Barnacle. 



Shell ovato-triangular, acute, compressed, but at the base 

 rather bulging, of live yellowish-white pieces ; the inferior- 

 lateral very large, subquadrangular, convex inferiorly, sloping 

 and flattened above, with numerous deeply impressed narrow 

 sulci, radiating from the lower anterior angle, and toward the 

 anterior margin a slender convex prominent rib ; the upper 

 valve triangular, elongated, tapering below to a very acute 

 point, and sulcato-striate ; the dorsal valve linear-lanceolate, 

 arcuate, carinate, with the sides convex and sulcate, the base 

 incurvate, expanded, semilunar; the peduncle very short, dusk3^ 

 Length six-twelfths, breadth four-twelfths and a-fourth. 



The above description from specimens presented to me by 

 Mr. William Robertson, who found them on a piece of cork 

 on the beach near Aberdeen, on the 1st of March, 1843, and 

 from specimens subsequently found by myself, in the same 

 place, intermixed with the preceding species. They vary 

 considerably in form, and while some of the smaller agree 

 with Montagu's description, in having few sulci, others have 

 double the number. 



Lepas sulcata. Mont. Test. Brit. 17. PI. 1. f. 6. 



Genus 2. Scalpellum. Lancet-Barnacle. 



Animal oblong, much compressed, enveloped in a deli- 

 cate mantle, open before and above ; cirri much curved. 



