THE CIRRIPEDIA. 



261 



males with hermaphrodites. Thus, Scalpellum vulgare 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 lampas ; female. 2. The same in sectional view: 27, Horny 

 disk 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, £, n, three seg- 

 ments of the thorax without cirri ; the other three segments, bearing the three 

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

 ages ; 6, vesicula seminalis ; o, eye; d, testis; k, orifice of the sac; m, pe- 

 nis. 4. Burrow of Alcippe in a portion of a Fusus shell. 5. Cryptophialus 

 minutus (female) with the outer inte<_rument removed: e, labrum : /, palpi; g, 

 outer maxillae; h, rudimentary maxillipede: c, wall of sac continued above 

 into the rim of the aperture a, b; I, m, abdominal cirri ; k, appendages of un- 

 known nature. 6. Male Cryptophialus. 7. Proteolepas bivincta : m, month ; g, h, 

 peduncle and antenna; i, 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 



