PLATE II. 



The following letters have the same signification throughout. 



cl. Cloacal papilla or opeuing. 



i. Intestine. 



m. Mouth. 



p. Parapodium. 



ph. Pharynx, 

 s. Sucker. 

 <5 . Male genital papilla or opening. 



Fig. 1. Myzostoma ambiguum, n. sp. 



Fig. 1. The animal, seen from the ventral side; magnified 75 diameters; Nos. I-X, 

 the numbers of the cirri. 



Figs. 2, 3. Myzostoma nanseni, n. sp. 

 Figs. 2, 3. Seen from the ventral side ; magnified 5^ diameters. 



Fig. 4. Myzostoma gigas, Liitken. 



Fig. 4. The left margin with the supernumerary cirrus (c) between the seventh and 

 eighth normal cirrus. 



Figs. 5-7. Myzostoma furcatum, n. sp. 



Fig. 5. The animal, seen from the right dorsal side ; magnified 5^ diameters ; with 

 the median dorsal elevation (a-a). 



Figs. 6, 7. The same, from the ventral side. m„ the outer, ca„ the inner caudal 

 appendage. 



