Prof. F. J. Bell on some Parasites of Fishes. 173 
almost equal fork to apex and outer margin; upper radial 
emitted from anterior angle of the cell, lower radial near to 
upper, so that the upper discocellular (which is inangled) is 
of about one third the length of the lower discocellular ; the 
latter is slightly arched and oblique; median nervules about 
equidistant ; submedian vein running rather near to inner 
margin: secondaries elongate triangular, subcaudate, and evi- 
dently internally lobed at anal angle (these wings are, how- 
ever, much injured); costal margin strongly lobate close to 
base, so as to commence with almost a rectangle, nearly 
straight from the angle to the apex; outer margin slightly 
convex and sinuous and very oblique; abdominal margin 
sinuous or elongate-sigmoidal to the extremity of submedian 
vein, where it appears to form an obtuse angle to first median 
branch (but unfortunately this part of the wing is chipped 
away) ; costal vein arched, with well-defined precostal veinlet 
projecting into the lobate subbasal angle; subcostal branches 
and radial emitted at equal distances, their points of emission 
forming an unbroken oblique line with the lower discocellular 
veinlet, which is about four times the length of the upper; 
second and third median branches emitted slightly nearer 
together than the first and second. Type D. Helmsii, 
Fereday. 
Dodonidia Helmsii. 
Genus? helmsit, Fereday, Trans. N.-Zeal. Inst. 1883. 
Paporoa Range, near Greymouth, South Island, about 
1200-1500 feet (&. Helms). ‘Type in Canterbury Museum. 
XXI.—Note on some Parasites of Fishes from Madras deter- 
mined by Dr. Orley. By Prof. F. Jerrrey Bext, M.A. 
BRIGADE-SURGEON Brpigz, in charge of the Government 
Central Museum at Madras, lately forwarded to Dr. Giinther 
some specimens of Entozoa found parasitic in some of the 
bony fishes of Madras, where their prevalence, or alleged 
prevalence, had given rise to one of those epidemics of dis- 
quiet which are best allayed by scientific knowledge and 
investigation. 
When the specimens in question were handed over to me I 
suggested, and Dr. Giinther was kind enough to accede to the 
suggestion, that their exact determination should be entrusted 
