Invertebrate Gallery of the Indian Museum. 47 



Eunice^ Hyalincecia, the last named from the 

 depths of the Arabian Sea. 

 Tubicola — Branchiomma, Chstopterus, and Serpula, 

 the last named also being from the deep-sea. 

 Besides the Indian representatives of the 

 Order there is exhibited a fine collection of 

 beautifully-prepared spirit specimens from the 

 Naples Aquarium, and in Case 47 are some 

 glass models. 



ii. CH^TOPODA OLIGOCH^TA. 



The other order of the Annelida Chxtopoda is formed 

 by the OUgochseta, and includes the Earth-worms and 

 River-worms. 



These much resemble the Polychaeta in that they have 

 a cylindrical body made up of rings or segments, but they 

 differ from the Polychxta in several inportant characters. 

 In the first place they have no definitely demarcated head 

 with palps and tentacles, and in the second place the seg- 

 ments of which the body consists never bear parapodia 

 and branchiae and have but few setae and these small. 



The details of the internal organization of a typical 

 Oligochaete — the common Earth-worm — are displayed in a 

 series of dissections in spirit in Case 44 to which explana- 

 tory drawings are attached. 



2. ANNELIDA ROTIFERA. 



The Rotifera or Wheel-animalcules are aquatic animals 

 of such microscopic size as to be beyond the limits of an 

 exhibition gallery, except in the form of greatly magnified 

 drawings. 



Though externally but little resembling adult worms 

 they have many essential characters in common with the 

 larval annelid type. 



The sexes are separate, and only the females attain 

 their full organization, the males being small, being devoid 



