Fig. 2. Parasites of Acanthurus triostegus sandvicensis. A, Colony of Hydrichthys sp. on the dorsal fin of a 
manini in its first day of transformation from the acronurus to the juvenile state. B, Hydrichthys on the post- 
orbital part of the head of a manini in its second day of transformation. C, Benedenia sp. from the epidermis 
of an adult manini; length of trematode, 1.9 mm. D, Ancyrocephalus sp. from the gills of manini; length of 
trematode, 0.63 mm. E, Hapladena varia Linton from the duodenum of an adult manini; length of trematode, 
2.9 mm. F, Adult female Spirocamallanus monotaxis Olsen from the intestine of adult manini; insert shows 
anterior end of the nematode (after Olsen, 1952); red in life, the females attain a length of about 45 mm. and 
the males about half this size. G, Unidentified leech (possibly Johanssonia sp.) from the gills of a manini; 
length of leech, 2.4 mm. 
