142 CONCHODERMA AURITA. 



C. capitido duohus tiibularibus quasi-auribus instructo, 

 pone terga rudimentalia (sape nidld) positis : scutis bilo- 

 batis : carina nulla, aid omnino rudimentali : pediincido 

 longo, a capitulo distincte separate). 



Capitulum with two tubular ear-like appendages, seated 

 behind the rudimentary and often absent terga ; scuta 

 bilobed; carina absent, or quite rudimentary; peduncle 

 long, distinctly separated from the capitulum. 



Filaments attached to the pedicels of the second cirrus j 

 two upper spines of the maxillae pectinated. 



Hab. — Mundane ; extremely common. On ships' bottoms from all parts 

 of the world. Arctic Sea. Greenland. Pacific Ocean. Often attached 

 to Coronulse on Whales. On slow-moving fish, according to Dr. A. Gould. 

 Often associated with C. virgata, and Lepas anatifera, L. Hillii, and 

 L. anserifera. 



General Appearance. — The capitulum (seen from above 

 in PL III, fig. 4 a) is slightly compressed, almost globular, 

 composed of thick membrane, with two large, ear-like, 

 flexible, tubular, folded appendages, at the upper end, 

 opening into the sack. These appendages are seated 

 behind the rudimentary terga when such are present, or 

 behind the spots which they would have held if not 

 aborted. In a young condition they are tubular, but not 

 folded ; and often, according to Prof. Macgillivray, either 

 one or both are at first imperforate. They are formed ex- 

 ternally of the outer membrane of the capitulum (rendered 

 thin where folded), and internally of a prolongation of 

 the inner tunic of the sack ; between the two, there is, 

 as around the whole sack, a double layer of corium. A 

 section across both appendages, near their bases, is given 

 in PI. Ill, fig. 4/5, showing how they are folded, — the 

 chief fold being directed from below upwards, with a 

 smaller fold, not always present, from between the two, 

 outwards. The folds sometimes do not exactly corre- 

 spond on opposite sides of the same individual ; they are 

 almost confined to the lower part, the orifice itself being 

 often simply tubular. These appendages are sometimes 

 very nearly as long as the whole capitulum : a section 



