PLATE IX. 
In all tlie Plates the following letters have the same signification. 
c Marginal cirrus. 
cl. Cloacal papilla or opening. 
i. Intestine. 
m. Mouth. 
ma. Manubrium of the supporting stalk of the hook-apparatus. 
ov. Ovarium. 
p. Parapodium. 
pli. Pharynx. 
s. Sucker. 
t. Testicle. 
u. Hook of the hook-apparatus. 
$ Male genital papilla or opening. 
Note . — The coloured drawings show the object seven times magnified; the uncoloured drawings are drawn with the 
Oberhauser camera and objective 0 (Seibert and Krafft), which magnifies 40 diameters, the hook-apparatus with camera"and 
objective IY., which magnifies 220 diameters, if the contrary be not expressly stated. 
Fig. 1. Myzostoma dentatum, n. sp. 
Fig. 1. The animal, seen from the ventral side. C and C 1} unpaired median cirri. 
Figs. 2-5. Myzostoma irregulare, n. sp. 
Figs. 2-5. All the figures represent only one-half of the animal, with or without median 
cirri C and C v 
