ELA SMOBRA NCH1I 



fold is produced at its hinder margin into an outstanding lobe. The 

 basipterygium is continued backwards into this lobe as a cartilage 

 rod, consisting, as a rule, of two short anterior and one long 

 posterior segment. A dorsal groove carrying the skin with it is 



sty 



FIG. 89. 



Raja Wanda, Holt. Dorsal view ; the cartilaginous skeleton has been completely exposed 

 on the right side, a, b, c, d, f, cartilages of clasper ; a.l, anterior lobe of pelvic fin; '//>. 

 basipterygium ; d, clasper ; c.p, covering-plate ; i.p, iliac process ; o.s, opening of sac ; p, pelvic 

 girdle ; p.p, prepubic process ; pr.r, enlarged preaxial radial ; pt, posterior preaxial radial ; x, 

 dotted line indicating ventral glandular sac ; st, second segment of basipterygial axis ; sty, 

 styliform cartilage. 



developed along this terminal piece, which becomes hollowed out to 

 receive it. The edges of the cartilage are rolled round so as almost 

 completely to enclose the groove in a split tube open at both ends 

 (Fig. 88). Spermatozoa may pass in at the front and out at the 

 hind end. The internal tegumentary tube projects forward as a 

 blind sac, and from its wall develops a special gland. The main 



