ii8 Memoirs of the Indian Museum. [Vol. V, 1915.] 



median. In most individuals each costa consists of about 28 ciliated plates, which 

 diminish gradually in size towards both extremities. Neither the number of plates 

 nor the exact proportions of the costae are quite constant and individuals occur in 

 which one or more of the costae are shorter than the others; in one individual 

 examined the number of plates varies from 16 to 23. In all our specimens the 

 tentacle-base is pressed more or less closely against the stomodaeum and is, perhaps 

 for this reason, concave, but in the living animal its precise relative position, like 

 the precise outline of the whole organism, is liable to almost constant change. The 

 tentacles are capable of great elongation ; processes are absent from a considerable 

 part of the distal half, but are uniformly developed on the remainder of each ten- 

 tacle; to judge from specimens in which they are contorted, they are cylindrical and 

 capable of being coiled in a close spiral with many whorls. In life the tentacles are 

 yellow and the remainder of the animal colourless. 



The longer axis never exceeds 1 cm. in length. 



We have examined specimens of this form from the coast of Orissa and from the 

 Ennur backwater near Madras, as well as from all parts of the Chilka L,ake. The 

 animal swims as a rule from 2 to 4 feet beneath the surface. 



In many of our specimens taken in July the jelly, more particularly in the 

 neighbourhood of the stomodaeum, funnels and tentacle-sheaths, contains a large 

 number of minute and apparently immature Distomid trematodes. They are ac- 

 companied by eggs, hardly smaller than themselves, resembling those found in the 

 canals of the young of Acromitus rabanchatu (p. 102, antea). On the external surface 

 of a few individuals we found Protozoa of the genus Trichodina. 



The type-specimens of the race are numbered Z.E.V. 5936/7 in the books of 

 the Indian Museum. 



