1921.] T. Kaburaki : Notes on Leeches. 693 



able to observe any trace of the dark spots on the posterior sucker, 

 which are to be observed in C. respirans. The body is about 21 

 mm. long by 3"5 mm. across in the middle of the abdominal region. 



The complete somite is formed of seven rings. In the first 

 eleven somites of the abdominal region each somite carries a pair 

 of the pulsating vesicles which, in diastole, arch up the skin, usual- 

 ly extending over rings 2 to 5. 



The leech is wholly devoid of any trace of eyes, as is the case 

 with C. maminiUatus. 



The body in the preserved state is of a dirty brown colour, 

 being marked with a darker shade in the region of the genital 

 openings, just anterior to the abdomen. 



The mouth lies near the centre of the anterior sucker and 

 leads nto the pharyngeal sheath with the pharynx, which is cylin- 

 drical in shape and extenrls over about three somites, vii-ix. Wide- 

 ly distributed on either side of the pharynx are numerous sali- 

 vary glands, which make their way to the base of the pharynx. 

 The crop represents a distensible part of the digestive tract and is 

 provided with seven pairs of subdivided lateral diverticula which 

 come off metamerically in each of the first seven somites of the 

 abdomen. The last pair are reflected posteriorly and extend into 

 somite xxii, giving off a secondary, outwardly directed diverti- 

 culum in each somite and appearing to fuse together metamerically, 

 as stated by Johansson. The stomach possesses four pairs of near- 

 ly pear-shaped lateral pouches, a pair in each of somites xix-xxii. 

 The intestine is in the form of a more or less wide canal, passing to 

 the dorsally situated anus between somites xxvi and xxvii. The 

 walls of the stomach and intestine are richly supplied with blood 

 vessels. 



The vascular system seems to be similarly constructed to that 

 of other Ichthyobdellids, there being the dorsal and ventral vessels, 

 which lie respectively in the dorsal and ventral sinuses of the 

 coelome. These sinuses give off metamerically arranged transverse 

 branches and communicate with the lateral vesicles, thus forming 

 a complete circle. 



The male genital orifice, though I could not determine it with 

 certainty, appears to lie between the last two rings of somite xi ; the 

 female orifice is seven rings behind the male, that is in somite xii. 



The six pairs of testes lie anterior to each of the first six pairs 

 of lateral diverticula of the crop. Anteriorly the vasa deferentia 

 on each side assume the character of a wide tortuous passage, and 

 after uniting to form the "prostate," open to the exterior hy the 

 male orifice. The female organs appear to be similar in structure 

 to those of other Ichthyobdellids. 



Genus Piscicola, Malm. 



5. Piscicola olivacea, Harding, 1920. 



This species, as mentioned in my recent paper (loc. cit.), is 

 fairly common in the Chilka Lake and occurs usually attached to 



