1909.] N. AnnandaIvE : The Indian Cirripedia Pednnadata. 75 



European or North American examples. I may also note that in European speci- 

 mens of L. pedinata 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. anseri/era and L. anatifera of lyinné ; but those that represent the 

 latter do not belong to the typical form of the species. 



Lepas anseri/era , Linné. 



CapituIvUM 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 

 ofï) ; the dorsum plain or pectinated. 



Peduncle 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 



