1909.] 
N. Annandai^e : The Indian Cirripedia Peduncnlata . 
75 
European or North American examples. I may also note that in European speci- 
mens of L. pectinata sent me by Professor Bouvier and identified as such by 
M. Gruvel I find considerable variation as regards the distance of the vertical 
ridge on the scutum from the occludent margin. 
In any case it will be as well to give detailed descriptions of the two forms which 
occur together in the Bay of Bengal, basing these descriptions on an examination of 
fresh material, in which the characters are naturally better seen than in material that 
has been long in spirit. I see no reason to doubt that these two forms represent, res- 
pectively, the L. anserifera and L. anatifera of Einné ; but those that represent the 
latter do not belong to the typical form of the species. 
Lepas anserifera, Linné. 
Capitulum broadly triangular, compressed ; occludent margin sinuous, carinal 
margin curved. Valves thick, opaque, white, with strong radiating ridges and lines of 
growth, occupying the whole of the capitulum, covered by a delicate yellowish mem- 
brane, which is very liable to be rubbed off. Ter gum almost quadrilateral, the apex 
being more or less definitely truncate ; the occludent margin straight, slanting out- 
wards ; the scutal margin about three times as long as the occludent, without a strong 
tooth at the occludent angle. Scutum large, subtriangular, somewhat convex (es- 
pecially at the base); nearly as broad at the base as long ; the occludent margin boldly 
arched, forming the outer limit of a narrow (more or less), spindle-shaped area, of 
which the inner limit is formed by a bold vertical ridge on the valve ; each scutum 
with an internal umbonal tooth, but the tooth on the right scutum always stouter 
than that on the left. Carina broad laterally, tapering above to a point, deeply 
concave within ; produced below the base of the scutum and forming a prominent 
inwardly directed tooth, bearing two vertical branches, which meet one another at 
an angle greater than a right angle (or rather, would do so were not the angle rounded 
off) ; the dorsum plain or pectinated. 
Peduncee usually shorter than the capitulum, never much longer, cylindrical, 
without vertical ridges, variable in colour, being wholly deep orange in some indivi- 
duals, wholly dark purple in others, mostly purple but orange at the capitular end in 
some. 
The lining membrane of the capitulum dark purple, usually becoming orange at 
the edges of the aperture, so that the occludent margins of the terga and- scuta appear 
of the latter colour. Body of the animal white, more or less deeply tinged with pur- 
ple, with a dark purple streak along the dorsal surface. All the cirri dark purplish 
brown. The oral appendages covered with purple pigment cells. On the mandibles 
these form a conspicuous scalariform line parallel to the edge but at some distance 
from it. As a rule one of the lateral appendages on the prosoma is purple, while the 
others are white. The anal appendages are purplish brown. 
Cirri, etc. — The cirri are moderately long, not so boldly curved as in some species. 
Each joint bearing in front a broad band of soft hairs and a small bunch of short, 
stiff hairs at the apex behind. The two rami of the first cirri are unequal, the posterior 
