330 Records of the Indian Museum. [VOL. XI, 1915.] 
(11) Disease in the eye of Holocentrum rubrum. 
(Plate xxviii, fig. II). 
The opportunity is taken of recording in this paper the occur- 
rence of a disease of the eye in Holocentrum rubrum. This fish is a 
marine species. 
I noticed the disease in question in January, 1915 during a 
visit to the Marine Aquarium, Madras, where the fish was then 
living in one of the tanks. 
I am indebted to Dr. J. R. Henderson, Superintendent of the 
Madras Museum, for kindly presenting the specimen. Dr. Henderson 
suggested that the disease was a glaucoma, probably caused by an 
accident whilst the fish was being captured at sea or during its 
transference to the aquarium. 
Since the above paper was written I have obtained very large 
cysts containing young Trematodes from the flesh of Ophio- 
cephalus striatus, Ophiocephalus marulius and Ophiocephalus gachua. 
Smaller cysts, apparently containing Cercaria, have also been ob- 
tained from the flesh of Saccobranchus fossilus and Trichogaster 
fasciatus. In Saccobranchus fossilus over 140 cysts were counted 
in the flesh of a small specimen. 
The infected fish were obtained from beels in the Khulna 
district. I hope to describe the parasites in a future paper. 
ee Oe ee 
