HERMAPHRODITE. 227 



bottom of the peduncle becoming flattened and broadly 

 attached, which would be here impossible, the cement is 

 poured out through a straight row of orifices along the 

 rostral edge, thus causing, by an excellent adaptation, a 

 narrow margin to adhere firmly to the thin and cylin- 

 drical branches of the coralline. These orifices are repre- 

 sented, magnified seven times, in PI. IX, fig. 7, in which 

 the lower attached portion of the peduncle is split 

 open and exhibited; they are circular, and stand at 

 regular intervals, in a straight line ; the higher orifices 

 are larger, but further apart from each other than the 

 lower ones ; in one fall-grown specimen, I counted ten of 

 these orifices in a length of exactly a quarter of an inch. 

 At each period of growth, the corium recedes a little 

 from the attached portion of the peduncle ; of which 

 portion, the greater part is thus left empty and as inca- 

 pable of further growth, as are the larval antennae at the 

 the extreme point : in the specimen figured, the corium 

 extended a little below the upper orifice. The prehensile 

 antennae, however, I must remark, do not strictly rise 

 from the extreme point of the peduncle, but at a little 

 distance from it, on the rostral surface ; this simply 

 ensues from the antennae in the larva, being situated on 

 the sternal surface, close to, but not actually on the front 

 of the head. The two cement glands are seated high up 

 on the sides of the peduncle, and remote from each other; 

 they are small, unusually globular and transparent. The 

 two cement-ducts (fig. 7 a a) proceeding from them, are 

 booths of an inch in diameter, and run in a zig-zag line ; 

 at the point where they pass through the corium to enter 

 the lower attached portion of the peduncle, they become 

 closely approximated, and partially imbedded in the 

 membrane of the peduncle. Together they run along 

 the rostral edge, giving out through each orifice a little 

 disc of brownish cement, and finally they enter the larval 

 antennae. The peduncle, just above the attached por 

 tion, where still lined by corium, no doubt increases in 

 diameter at each period of growth, and must, I presume, 



