CHONDRACANTHUS GIBBCSUS. 



239 



the vulva. The lower part of the oviduct contains a clear 

 gelatinous substance, and is very similar in aspect to the ce- 

 ment duct of a cirripede ; this substance is secreted by the 



Fig. §\.—Chondracanthus gibbosus.— Female: A, lateral view. JB, ventral view, en- 

 larged : a. head ; b, c, appendages ; d, median dorsal process ; e. median ventral 

 processes; /, i, h, lateral processes; k, terminal segment; I, male; g, ovisacs ; 

 m, w, medio-dorsal ovarian tubes : p, lateral ovarian tubes ; o, oviduct. 2, 3, an- 

 tennules ; 4, 5, 6, antennae, gnathites. 



walls of the oviduct, and forms the walls of the ovigerous sac. 

 The latter, as has been stated, has the form of a long cylin- 

 drical filament, the upper end of which is firmly held between 

 the prominent lips of the vulva (Fig. 62, ac). 



The male Chondr acanthus does not attain to a twelfth the 

 length of the female, and looks, at first, like a papilla upon 

 16 



