302 Professor MacGillivray on the Cirripedia. 
posterior more prominent, more deeply sulcate, and quite differently 
curved at the base, it being there suddenly inflexed. Lepas anatifera 
has a wide membranous space between the dorsal plate and the dorsal 
margin of the lower plate ; Lepas incurvata has also a wide space there ; 
but in Lepas striata there is scarcely any, the margins of all the plates 
being almost in contact. The dorsal plate in Lepas incurvata extends 
one-third up the upper plate, in L. anatifera half-way, in L. striata two- 
thirds. 
The species here described is the same as one which I have frequently 
met with on planks, logs, and tangles, in the Outer Hebrides. It does 
not, however, grow on the tangles in their natural state, it being only 
when they have been floating in the sea, after having been dried on the 
sands, that they form upon them. The same species I havealso found on 
corks on the east coast of Scotland. Itis that described as Lepas striata 
in the Mollusca of Aberdeenshire. 
It is not easy to find references for this species. Although referred 
by many to Lepas anserifera of Linneeus, it certainly is not that species ; 
nor is it Anatifa striata of Bruguiere, Lamarck, or Philippi, which they 
refer to Lepas anserifera, and has the valves “ argute striate.” It is 
very certainly Anatifa striata of Dr Gould, his descriptions agreeing in 
every particular and circumstance. I find no other specific name for it 
than Anserifera and Striata, to neither of which can it lay claim, and there- 
fore am obliged to get it a new name, until some priority person find an 
old one for it. 
It occurred in small numbers, along with Lepas anatifera and L. in- 
curvata, in the midst of a dense mass of Otion and Cineras, on the bows 
and sides of a Fraserburgh brig, which came to Aberdeen in the begin- 
ning of January 1845. 
Lepas anserifera. Mont. Test. Brit. 16. 
Lepas anserifera. Turt. Conch. Dict. 72. 
Lepas striata. MacG. Mollusca of Aberdeenshire, 357. 
Anatifa striata. Gould, Invert. Massach. 20. 
The dimensions of several individuals are :— 
= 
Length, Bere 1 th Q 0 10 0 9 
Depth, . Pee VD a 0 8 QO 54 AS 
Breadth, a "Oe 0 3 0 4 0 2% 0 24 
Peduncle, 0 10 0 4 0 5 0 4 0 5 
3. Lepas incurvata. Incurvate Barnacle. 
Anatifa elongata. Quoy et Gaimard. 
Tegmen semicordate or ovato-oblong, with the anterior margin straight 
or recurvate, compressed, tumid below, obtuse; the lateral plates very 
thin, fragile, bluish-white, slightly glossed or dull, obsoletely rugose, 
with very minute radiating striule ; the lower plate subovato-tetrago- 
nal, with the basal margin convex, the posterior rounded and equal, the 
sutural convex, the apex acute ; the upper plate oblongo-tetragonal, ob- 
tuse at both ends, with the supraumbonal side as long as the anterior ; 
the dorsal piece narrow-oblong, convex, sulcate or striate ; the pedun- 
cle rugose, minutely granulate, brownish-black, the epidermic portion 
of the tegmen partly dull scarlet or dingy orange ; the cirri dusky. 
The body of the animal is ovate, very convex on the back, narrow be- 
hind ; anteriorly soft, with a membranous integument, which becomes 
horny on the hind part, where it is marked beneath with faint transverse 
