530 LEPADID7E. 



Alcippe lamp as, Hancock ut supra. 



I lab. — North-eastern shores of England, fifteen to twenty fathoms, imbedded 

 in dead shells of Fksus untiquus and Bucdnum undatum (A. Hancock); south- 

 eastern shores, off the Eddystone Lighthouse (C. S. Bate). 



FEMALE. PI. 22. 



I may premise that after the sketch of the leading pecu- 

 liarities of Alcippe, and after the discussion on its affinities, 

 just given under the Family, I think it would be superfluous 

 to institute a full generic description, separately from the fol- 

 lowing detailed account of this most anomalous cirripede. 



General Appearance, — The whole animal is from -2 to 

 •3 of an inch in length, of a soft texture, colourless or 

 yellowish, and lives concealed in a cavity of its own 

 formation in the shells of certain Gasteropods. This cavity 

 communicates with the water bv a narrow fissure-like orifice 

 (PL 22, fig. 4), broadest at the posterior end, where the cirri 

 are exserted ; narrow, closed, and generally curved at the 

 other {a) end : the two sides of the fissure (b) are commonly 

 bordered by a calcareous inorganic deposit : the walls of 

 the cavity are worn so thin over the peduncle, at the 

 narrow end of the fissure, that the orange-coloured ovaria 

 can generally be seen through the shell of the mollusc, and 

 hence there is here a distinct fan-shaped stain (fig. 3) on 

 the surface. The animal consists of a compressed capitu- 

 lum, without valves, and of a sort of peduncle depressed 

 on its rostral face, and covered with a broad, oval, thin, 

 horny disc. We must remember that in the Lepadidae the 

 peduncle does not essentially differ from the capitulum, 

 being only the flexible lower or anterior end of the animal, 

 and is separated from the capitulum only by shape, and 

 generally by the direction of the lines of growth. The disc, 

 when most regular (fig. 1, h), lies in a plane at right angles 

 to the sides of the capitulum, and almost in a line with the 

 orifice leading into the sack ; but the peduncle is often very 

 irregular (fig. 2), and the disc comes even to occupy a position 



