THE CIRRIPEDIA. 



261 



males with hermaphrodites. Thus, Scalpellum vidgare is 

 hermaphrodite, possessing well-developed male and female 

 organs. Nevertheless, on the inner side of the occludent 

 margin of its scutum there is a fold, over which and imbed- 

 ded in the spinose chitinous border of the scutum, a minute, 

 oval, sac-like creature is commonly found, firmly attached by 



Fig. 69.— 1. Alcippe lamnas ; female. 2. The same in f=ectiona] view: H, Hornv 

 AWk. of attachment ; in 1, the males are visible as dark specks on either side of 

 the upper part of the sac ; c, ovary; h. first pair of cirri ; k, l^ », three sesr- 

 ments of the tliorax without cirri ; the other three segments, hearing the three 

 pairs of terminal cirri, are very short. 3. Male Alcippe: a, antenna^y append- 

 ages ; 6, vesicnla seminalis ; o, eye; c?, testis; k, orifice of the sac: w. pe- 

 nis. 4. Burrow of Alcippe in a portion of a Fums shell. 5. Cryptophinlufs 

 minutus (female) with the enter inte<:nment removed: e, labrum : /. palpi; rj, 

 outer maxillas : A, rudimentary maxillipede; c, wall of sac continued above 

 into the rim of the aperture a. h; I, m, abdominal cirri : Jc. appendages of un- 

 known nature. (). Male Cryptophialns. 7. Protenlepas hivincfa : m. month ; g,h, 

 peduncle and antenna; 2, k, vesicula seminalis and penis. (After Darwin.) 



cement which covers the characteristic antennules of a Cir- 

 ripede. Within the sac is a thorax, with four pairs of rudi- 

 mentary appendages terminated by a short abdomen. There 

 is neither mouth, alimentary canal, nor gnathites, the cavity 

 of the body being principally occupied by a great seminal 



