1914-] N. AnnandaIvE : Pedunculate Cirripedes. 279 



tion of deep grooves and in the centre of each mesh there is a 

 projecting tubercle; below the aperture the surface is smooth or 

 marked with irregular (mostly transverse) grooves. No scuta 

 can be distinguished but the outline of a pair of irregular areas 

 is sometimes indicated on the smooth anterior part of the capi- 

 tulum, in the position they would occupy. The aperture is less 

 than a third as long as the capitulum and can be almost com- 

 pletely closed so as to appear merely as a narrow vertical slit 

 with horizontal grooves extending outwards from it when open 

 it is subtriangular and surrounded by a distinct fringe : it can 

 evidently also be protruded so as to be almost tubular. 



The peduncle is cylindrical. It is rather shorter than the 

 capitulum, but at the base is often produced in front in the form of 

 a tapering flattened process that lies in one of the grooves on the 

 sea-urchin's spine and sometimes is as long or nearly as long as 

 the peduncle. 



The cirri are short and feebly curved, but the rami are 

 relatively long as compared with the undivided basal portion. 

 The first cirrus is widely separated from the second and d.ffers 

 considerably in outline from all the others. Its anterior ramus 

 is much the shorter and more slender of the two (although each 

 has 8 joints) and is nearly cylindrical in form. The posterior 

 ramus tapers to a point, and is considerably swollen at the base. 

 In both rami the apical part of each joint bears a more or 

 less incomplete circle of very stout bristles; on the basal joint of 

 the posterior ramus the circle is widely interrupted posteriorly. 

 On the anterior ramus the circle is so deep that it occupies a half 

 or even two-thirds of some of the joints. The other cirri are 

 similarly armed, but the circles of bristles, which are complete 

 on the anterior cirri and laterally interrupted on the posterior 

 ones, are not so deep. 



The anal appendages are long and slender, having 7 or 8 

 joints, the tip of each of which is surrounded by a sparse circle 

 of long but very fine hairs. The distal part of the appendages is 

 much attenuated. 



The penis is slender and smooth, much contorted in the pre- 

 served specimen and clothed with fine hairs. 



The mouth-parts are very prominent. The labrum is not 

 buUate; it bears a semicircle of minute, blunt chitinous teeth. 

 The mandible has four teeth, of which the outermost is the 

 largest. It is rather widely separated from the second tooth, 

 towards which it is slightly curved. The remaining three teeth 

 are straight, subequal and equidistant ; the second and third are 

 sharply pointed; their inner margin bears several short stout 

 spines that give it a pectinate appearance. The innermost tooth 

 is minutely bifid or trifid and bears on its inner edge several 

 irregular projections and a fringe of fine hairs similar to those 

 that cover the greater part of the body of the appendage. The 

 cutting edge of the maxilla is definitely scaiariform, with four 

 distinct steps; it bears numerous stout bristles. The second 



