FIG. 154. 



Aplysia leporina (dorsal aspect), with the parapodia and mantle reflected from the mid-line. 

 a, anterior cephalic tentacle ; 6, posterior tentacle (between a and 6, the eyes) ; c, right para- 

 podia ; <?, left parapodia ; e, hinder part of visceral hump ; f.a, anterior part of the foot, under- 

 lying the head ; f.p, posterior extremity of the foot ; g, ctenidium ; h, the mantle-skirt tightly 

 spread over the horny shell and pushed with it towards the left side ; i, the spermatic groove ; 

 fc, the common genital pore ; /, orifice of the grape-shaped gland ; , osphradium ; n, outline 

 of part of the renal sac below the surface ; o, external aperture of the kidney ; p, anus. (After 

 Lankester.) 



<ki 



fUL. 



FlG. 155. 



Dexiobranchaea pauciclens, Boas, 

 ventral aspect, V- c.r, posterior 

 ciliated ring ; /, anterior part of the 

 foot ; /', posterior part of the foot ; 

 fl, fins or parapodia ; g, gill ; pr, pro- 

 boscis ; su, suckers ; t, tentacle. 

 (After Boas.) 



Fio. 156. 



Halvpsyche gaitdichaudi, ventral aspect, 

 the body-wall removed, the head to the right- 

 hand side, a, the mouth ; c, the lin-like 

 lateral lobes of the foot ; rf, the anterior 

 median part of the foot ; e, cephalic tentacles ; 

 /, the posterior median part of the foot ; 

 k, retractor muscles ; I, appendages of the 

 cephalic tentacles ; o', anus ; o, p, liver ; 

 11, v, w, genitalia ; y, genital pore. (From 

 Lankester, after Souleyet.) 



172 



