350 Records of the Indian Museum. [Vol. XY, 



Habitat.— -The mesentery of Trichogaster fasciatus, Bl. Schn., also 

 found on the mesentery of Nandus nandus (Cuv. and Val.), Klmhia, 

 district Khulna, Bengal, April 1915, and May 1917. Nmnerous speci- 

 mens ; types in the collection of tiie Zoological Survey of India (Indian 

 Museum), No. W \^ 



Literature cited — 



1. Braun, M. — Vermes, A. Trematodes ; Bronn's TJderreicJis, 



Bd. IV. Leipzig, 1892-93. 



2. ,, Die Arten der Gattung Clinostomum Leidy. 



Zool. Jahrb., Ahtli. f. Sijst., Bd. XIV, Heft 

 I. Jena, 1900. 



3. Faust, E. E. — Notes on the Cercaria of the Bitter Root 



Valley, Montana. Journal of Parasitology, 

 Vol. III. Urbana, Illinois, March, 1917. 



4. Leidy, J. — A synopsis of Entozoa, etc. Proc. Acad. Nat. 



Sci. Philadelphia, 1856. 



5. Looss, A. — Beitr. zur. Kenntn. der. Trematoden. Z. wiss. 



Zool, Vol. 41. Leipzig, 1885. 



6. Liihe, M. — Die Sussivasserfauna Deutschlands 1. Trema- 



todes. Jena, 1909. 



7. Osborn, H. L. — -On the structure of Clinostomum marginatum 



a trematode parasite of the frog, bass and 

 heron. Journ Morph. XXIII, 1912. 



8. Pratt, H. S. — Synopsis of North American Invertebrates, 



"XII. The Trematodes, Part II. The As- 

 pidocot3dea and the Malacocotylea, or Di- 

 cenetic forms. American Naturalist, Vol. 

 XXXVI, No. 431, Boston, November 1902, 

 and No. 452, December 1902. 



{b) On a small collection of encysted larval Trematodes oy 



SOME Indian fishes. 



This is a record of the occurrence of encysted cercaria, of five different 

 types, found in various situations in some of the commoner Indian fishes. 

 As the sexual organs were not developed, and as the whole classification 

 of the adult Trematodes is based on the disposition of the generative 

 organs, we are unable to identify them further than to say that they 

 belong to the family Distomidae. The larval characters on which the 

 classification of the redia has been attempted by Liihe (3) and by Lebour 

 (2) do not help in further elucidating the situation of these forms. 

 The classification, according to Liihe, all depends on the different forms 

 assumed by the tails. Lebour's classification depends, on the other 

 hand, on whether the cercariae develop in sporocysts or in redia. As 

 will be clear both these classifications are extremely artificial and are 

 not, in most cases, of much assistance in identification, particularly of 

 encysted forms ; in such cases the tail of the cercaria is dropped before 

 encystment and the adult characters have not as yet developed. At 

 the same time we know nothing as to whether the cercaria were deve- 

 loped in sporocysts or in redia. 



