148 tlecords of the Indian Museum. [Vol. XV, 



smaller than the anal and of a brownish colour. The glochidia are 

 carried in all the four gills. 



The glochidia are nearly ovoid, with a very small, straight hinge-line 

 and a small hook on each shell (figs. 3 a-c). Gravid specimens of two 

 species were obtained, /. caerulea var. gaudichaudi and /. pacliysoma. 

 Females of /. pachysoma were collected on the 14th of January 1912, 

 in a lake nine miles from Berhampur, Bengal ; the glochidia (fig. 3 





(ilocliidia of (a) I. pachysoma, side view, (b) Inner view of the lower portion of 

 the shell of the glochidium of /. pachysoma, showing the hook, (c) Glochidium of /. 

 cterulea var. gaudichaudi. 



a, h) are -248 mm. by -115 mm. in size. The specimens of I. caerulea 

 var. gaudichaudi were collected on the 1st of April 1918, from a pond 

 four miles from Serampur, in the District of Hughly, Bengal. The glo- 

 chidia (fig. 3c) measure -289 mm. by -182 mm. ; they are of the same type 

 as that of 7. jjachysoma except that they are bigger. 



The glochidia of this genus are very different from those of the other 

 known Indian genera. They differ in shape and show a distinct advance 

 in that the flange on the lower margin of the shell of each side is becoming 

 more highly evolved and is restricted to a hook in the centre. 



Fish hosts. 



In this section I do not attempt at any specific identification of the 

 glochidia, which were found encysted on the fins of a large collection of 

 fishes from the Satara and Poona districts of the Bombay Presidency. 

 The localities and the conditions under which these fishes were collected 

 are fully discussed by Dr. Annandale in the systematic account of these 

 fishes to be published shortly in the •' Records,'' and I need no more 

 than give a list of the various species which were found to have 

 glochidia on their fins. 



Nemachilus savona (Ham. Buch.). 



Nemachilus anguilla, Annandale. 



Psilorhynchus tentacidafus, Annandale. 



Cir hina reba (Ham. Buch.). 



Barbus malabaricus, Jerdon. 



Barbus jerdoni, Day. 



Barbus ticto, Day. 



Rasbora daniconius (Ham. Buch.). 



Danio aequipinnatus (McCl.). 



Chela booins, Day. > 



Oj)hiocephalus gachua (Ham. Buch.). 



Gobius bombayensis, Annandale. 



