PRELIMINARY DESCRIPTIONS OF SOME JAPANESE TRICLA.DS. 



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genital vestibulum at the upper end, where the small receptaculum also 

 opens by a short stalk (vagina) from behind. 



Possibly the species deserves to be made into a new genus, chiefly on 

 account of the dorsal prolongation of genital vestibulum, of the oviducts 

 opening separately into it without uniting into an unpaired common duct, 

 and of the very short vagina. 



Locality : — Numerous specimens of this species were collected in 1889 

 at Ajino, Prov. Kizen, by Professor Kishinouye. The worms occur in 

 abundance on Limulus longispina, attached on the hard surface of the 

 proximal segments of cephalothoracic appendages, especially of the last 

 three pairs of these. 



Paludicola. 



4. Bfletlocephala aimandalei, n. sp. 



Woodcuts 6—8. 



Body large, thick, elongate-ovate. Head lobe narrow and distinctly 

 marked off from trunk ; when in motion, less than one-third as broad as 

 the broadest part of trunk. Frontal margin of head-lobe crenate ; median 

 convexity strongly arched, exhibiting some small adhesive folds on the 

 inferiorly turned swollen edge (woodcut 7) ; close behind that edge a 

 groove-like depression ; lateral lobes not prominent. Trunk thick, convex 

 above, flat beneath, rounded at posterior end. Commonly very large, 

 reaching 40 mm. in length and 15 mm. in breadth at the pharynx 

 region. 



Color of dorsal surface variable, but usually reddish brown ; the 

 positions of pharynx and copulatory organs indicated by nearly colorless 

 spaces. Color of ventral surface much lighter than that of dorsal. 



Eyes two, widely apart, each surrounded by a clear space, situated at 

 the hind border of head lobe. 



Mouth slightly behind the hind end of the middle third of body. 

 Pharynx comparatively short, inserted at about the middle of body, and of 

 about one-sixth the length of entire body. Anterior gut trunk provided 



