PISHES OF THE PHH.IPPINE AND ADJACENT SEAS 41 



toothless. Gill membranes more or less joined to isthmus. Gill 

 rakers very small. Pseudobranchiae very large. Branchiostegals 6 

 or 7. Vertebrae 24, of which 14 caudal, anterior abbreviated. Scales 

 moderate or small, finely ciliated or nearly smooth, cover body and 

 head, dense over soft vertical fins. Lateral line present, arched Hke 

 back but not reaching caudal fin. Dorsal smgle, continuous, rays 

 sometimes filamentous. Anal like soft dorsal, with 3 or 4 spines. 

 Caudal usually truncate. Pectoral small. Ventral thoracic, with 

 spine and 5 rays. 



Carnivorous tropical reef fishes. Almost all are handsomely and 

 brilliantly colored, often with ornamental design. They are active 

 and graceful swimmers. The young are quite unlilve the adult and 

 in the early or TholicMhys stage with membranes developed as broad 

 collars or plates about the head and neck. The following are young 

 m the TholicMiys stage which we have been unable to identify : 



One example. Busin Harbor. April 22, 190S. Length 14 mm. 



One example. Masamat Bay, Quinalasag Island. June 11, 1909. Length 



10 mm. 



One example. Nogas Point, Panay Island. February 3, 1908. Length 



11 mm. 



One example. INlarinduque Island at Santa Cruz. April 23, 1905. Length 

 16 mm. 



One example. Tumindao anchorage. February 25, 190S. Length 18 

 mm. 



Two examples. Varadero Bay, Mindoro. July 23, 1908. Length 10 to 

 21 mm. 



One example. D. 55S8. Philippines. September 28, 1909. Length 20 

 mm. 



One example. D. 5129. Philippines. Length 20 mm. 



ANALYSIS OF THE GENERA 



aK ChaetodontIxNae. Preopercle unarmed; scales rather large; young mostly 

 with Tholichthys stage. 

 bK Snout tubiform, elongated, produced. 

 d. Dorsal spines 9 to 11. 



d'. Dorsal spines 9 Chelmo 



d^. Dorsal spines 11 Chelmonops 



c2. Dorsal spines 12 or 13 Forcipiger 



b^. Snout conic, moderate or short and not especially produced. 



eK Dorsal spines not greatly elongated or prolonged in flexible filaments. 



p. Teeth rudimentary or absent; dorsal spines 8 to 10 Coradion 



p. Teeth well developed. 



g\ Dorsal spines 6 or 7; front dorsal and anal rays prolonged. 



Parachaetodon 

 gK Dorsal spines 10 to 16. 



hK Scales large, 30 to 50 Chaetodon 



h'^. Scales sntall, more than 60. 



iK Scales 60 to 75. 



p. Teeth small; dorsal rays 24 to 26 Hemitaurichthys 



p. Teeth long, large, strong; dorsal rays 17__Microcanthus 



i'. Scales 88 to 90 Vinculum 



