114 Director s A)nuial Report. 



tance from the base of first dorsal spine to upper nostril is 1.33 into 

 head. The mouth is perfectly horizontal on the median line. 

 Teeth: A single series of compressed incisors, 10 on each side of 

 upper jaw. Branchiostegals 4. Pseudobranchise developed. Fins: 

 The height of the fourth dorsal spine a little greater than the dis- 

 tance from its base to anterior base of first dorsal, the first dorsal 

 -spine about 2 into head. The caudal emarginate, the upper lobe 

 slightly longer, its length 4.20 into length of fish. Longest ray of 

 pectoral 1.33 into head, its base 4.25. Longest ray of ventrals 1.66 

 into head. Color in spirits: Light brown with a wash of grayish; 

 a greenish streak, beginning at anterior edge of orbit, descends in 

 a curve along sides of snout to angles of the mouth. Back with a 

 blue line along base of dorsal fin. The interorbital space is crossed 

 b}- a green band about half as wide as eye; this band crosses fore- 

 head and curves back over orbit to near top of opercles — in speci- 

 mens long in spirits this green interorbital marking is apt to be faded 

 out. The sides of caudal peduncle are yellow without a black area 

 between the two spiny plates. Dorsal black with a white line begin- 

 ning narrow in front, broadening posteriorly to half the height of 

 the fin; above this is a narrow terminal line of black. Anal green- 

 ish white margined with a narrow line of black, the inner third 

 without the conspicuous wash of brown seen in M. garretti. Pect- 

 orals and caudal brownish, the latter with a green and white mar- 

 gin posteriorly. Three specimens, length 5 inches. Agaila, Guam, 

 July, 1900. Hab. Polynesia, Marianas. 



225-227. Monoceros marginatus Cuv. & Val. Taloga. 



Head 3.66; depth 2.33; interorbital 3.50; eye 4.50, 3 into snout. 

 Forehead with a short horn-like prominence projecfting forward 

 diredtly in front of eye. In specimens 1 1 inches in length this horn 

 is about three-quarters of an inch; measured from the orbit to tip 

 it is 3 into head; in younger specimens it is shorter, and is entirely 

 absent in specimens three inches in length. D. vi 29; A. ii 28; 

 V. r, 3. Scales minute, rough. Mouth perfedlly horizontal; about 

 15 small sharp teeth on each side of upper jaw, about 12 on each 

 side below; these teeth are minutely serrated on their inner side. 

 Branchiostegals 4. Pseudobranchise well developed. Caudal pe- 

 duncle with two sharply keeled bou}' plates with blue bases, absent 

 in young. Fins: The caudal is broad and emarginate, the upper 

 ray the longest, being equal to length of head. The dorsal has its 

 origin direcftly above the posterior line of the head; its spines and 

 rays are markedly triangular in transverse secflion, the first spine 

 the longe.st, 1.66 into head. Ventrals are .short, 2 into head. Pect- 

 orals 1.33 into head, their bases equal to eye. Color in spirits: 

 A dirty bistre olive, slightly lighter below, dorsal and anal slightl}- 

 darker with a narrow black margin. Anal with from 1-3 longitud- 



