6o2 Records oi the Indian Museum. [Vol. XXII, 



2. Ozobranchus papillatus, sp. iiov. 



The collection contains some examples which appear to repre- 

 sent a new species, found by Mr. E. A. D 'Abreu on the leg of 

 Kachuga tectum at Nerbudda, Nagpur. 



The species closel}' resembles the preceding, in its external 

 features there being distinguished two distinct regions, the neck 

 p.nd the abdomen, with the eleven pairs of digitate branchiae. The 

 t>'pical somite consists of two rings of nearly similar breadth, each- 

 ring in the abdomen being provided with conical papillae on the 

 dorsal surface. The papillae are of small size and present a single 

 sharp end, differing from 0. janlseanus. The colour of the body is 

 grey and exhibits no trace of markings, except a darker shade in 

 the anterior region of the abdomen. All the specimens are strong- 

 ly contracted and are about 7 mm. long by 4 mm. broad at 

 the middle of the abdomen. The most conspicuous character 

 which distinguishes this species from 0. jantseanus is the absence of 

 any trace of ej^e-like organs. 



Genus Pterobdella, Kaburaki. 



3. Pterobdella amara, Kaburaki, iq2i. 



In a recent paper ' I placed on record in some detail this inter- 

 esting species which was found in the Chilka Lake, adhering to the 

 mouth of Hypolophus sephen and Trygon uarnak. The trunk is of 

 a peculiar shape, being divided into three distinct regions, of which 

 the anterior two each carry a pair of conspicuous lateral fin-like 

 bodies. The visual organs are entirely absent. 



Genus Cystobranchus, Diesing. 

 4. Cystobranchus anoculatus, sp. nov. 



In the collection there are three specimens which appear to 

 rtjpresent an interesting member of the genus Cystobranchus, theii 

 locality being unknown. Hitherto recognised as belonging to 

 this genus are four species,— C. rcspirans {Troschel)^ C. fasciatus 

 (KoUar), C. vividus Verrill and C. mammillattts (Malm), — all ecto- 

 parasitic on various freshwater fish such as Cypriniis carpio, 

 Barbus fluviatilis, Thymallus vulgaris, Rhodens amarus, Trtitta 

 fario, etc. Of these species C. mammillatus seems to be by far the 

 most closely related to the species here described. 



In shape this leech conforms to the typical Cystobranchus- 

 outline, with the short narrow neck, distinctly separated from the 

 abdomen, which is elongate, wide, of a nearly uniform breadth for 

 the greater part of its length and is provided, as in all species of 

 the genus, with eleven pairs of pulsating vesicles. The suckers 

 are large and are centrally attached, the anterior sucker being 

 about one-third as wide as the posterior. In no case have I been 



i See Kaburaki, Mem. Ind. Mns. V, p. 668, figs. 3, 4. 



