Kiu. Io4. 



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

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

 podia ; (I, left parapodia ; e, hinder part of visceral hump ; /.o, anterior part of the foot, under- 

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

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

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

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

 Lankester.) 



-fin, 



Fio. 155. 



Dexiohmnduua pauciilens, Unas, 

 ventral aspect, V- f - r , losterior 

 ciliated ring ; /, anterior jwvrt of the 

 foot; /', posterior part of the foot; 

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

 boscis ; .n, suckers ; <, tentacle. 

 (After Hoas.) 



Fin. 



IIfitn)v*yrhe (juitdirhntuli, ventral aspect, 

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

 hand side, o, the month; r, the lin-like 

 lateral lobes of the foot ; /, the anterior 

 median part of the foot ; ', cephalic tentacles ; 

 /, the posterior median part of the foot; 

 !>', retractor muscles; /, appendages of the 

 cephalic tentacles ; >', anus ; o, p t liver ; 

 , '", w, genitalia ; v, genital pore. (From 

 r, after Souleyet.) 



172 



