Report of a Mission to Ciuani. 117 



specimens do not have spines on the sides of the tail, and have the 

 dorsal spine much rougher, with indication of two or three rows of 

 barbules. Hab. Western Pacific, Marianas. 



Genus OXYMONACANTHUS Bleeker. 



242. Oxymonacanthus longirostris Bleek. 



Head 2.66; depth 2.66; eye 5; interorbital 4; D. i 35; A. 29. 

 The sides of the caudal peduncle with brush-like setiform spines. 

 Body oblong, compressed. The upper and lower profile about 

 equally oblique; the snout much prolonged, upper profile concave, 

 turned up at tip. Skin velvety. Mouth tubular, lips very thin. Gill 

 openings small, situated on a vertical line a little posterior of orbit. 

 Fins: The dorsal spine is of moderate strength, more or less 

 rounded — not 4-edged; the middle of its base is diredlly (in line) 

 above the pupil of the eye; its length is 1.50 into head, and it is 

 equal to the distance from anterior margin of eye to posterior mar- 

 gin of lips. The barbs are small and more or less irregularh' ar- 

 ranged, the most prominent being a row deflecfted downward on the 

 back of the spine. The ventral spine is rather prominent, rough, 

 fixed, with a thin abdominal membrane between it and belly. 

 Caudal rounded, short, 2.25 into head. Ventrals 3.50 into head. 

 Color in life: Blue, with yellow dots. In spirits: Light gray, with 

 a slight wash of bistre-brownish. vSeven longitudinal rows of round 

 white spots about the size of the pupil extending from the head to 

 tail; tip of snout white, followed b}- a narrow black ring; a line of 

 white extends from near gape to a little below the orbit; another 

 white line extends from the middle of sides of the snout to orbit, 

 more or less white dots below the e3-e and on sides of the thorax; 

 ju.st above the ventral spines is a black splotch with numerous very 

 fine white dots. Caudal fin brownish, white at tip, with an incom- 

 plete intermarginal black line half the width of e3"e. Dorsal, anal 

 and pecftorals white. Two specimens, length 4 inches. Agana, 

 Guam, June 14, 1900. Hab. Marianas. 



Family OSTRACIID^.— Trunk-fishes. 

 Genus I^ACTOPHRYS vSwainson. 

 243. I/actophrys nasus (Bloch.). 



Carapace, 5-ridged and spineless; P. 10; A. 9; C. 10. Color 

 in spirits: Greenish yellow, with numerous black spots along sides. 

 One specimen of a very young, length three-quarters of an inch, 

 was secured. Guam, July 14, 1900. Hab. Seas of India to Malay 

 Archipelago and western Pacific, Marianas. 



