212 ^- GOTO. 



This species is evidently closely allied, to Octobotlu-iiim palinatum, 

 F. S. Leuck. 



3. Diclidopliom sessilis, n. sp. 

 (PI. X, figs. 5-8 ; PI. XI, figs. 1-7 ; PI. XII, figs. 3-4.) 

 Boll/ about 5 mm. long, elongated-oval, generally broad but 

 narrower in front, anterior end obtuse, divisible into the body 

 proper and the caudal disc, which are separated from each other by a 

 sharp constriction. Body proper le.af-shap3d, occupying a little less 

 than three-fourths of the total length ; caudal disc small, bearing the 

 circular sucker on its margin. Suckers sub-sessile, arranged in a 

 semicircle close to each other. Oesophagus exceedingly short. The 

 two intestinal trunks sending out lateral branches outwards, connected 

 with each other by anastomosing commissures, and uniting with 

 each other at the level of the first pair of posterior suckers ; from 

 this intestinal loop backwards are given off numerous branches 

 which reach the base of the suckers. Common genital opening close 

 behind the termination of the oesophagus. Penis with six hooks. 

 Ovary occupying the middle of the body, long, t^vice folded on itself 

 in trie form of a W ; the last arm of the W, which gives rise to the 

 oviduct, is hollow, very much larger than the others, and is situated 

 farthest to the left. Oviduct arising from the large end of the ovary, 

 proceeds at first for a short distance towards the right, then bends, 

 and after proceeding backwards for some distance bends forwards and 

 towards the left, then again bends towards the left, and reaching the 

 right angle of the W-shaped ovary, is continued into the ootyp. 

 Oviduct bearing an exceedingly large seminal receptacle consisting of 

 numerous lobes at the point where it bends forwards to unite with 

 the yolk-duct. From the ootyp the uterus proceeds at first forwards 

 and towards the right, and reaching the median line of the body, pro- 



