112 Direno7'' s Annual Report. 



abdominal profiles are equally convex. Mouth is rather small; 

 the maxillary is contained about 4 into head, its distance from the 

 anterior edge of orbit is one-half its length. Teeth: A single row 

 of cutting incisors in each jaw, about 18 on each side of upper. 

 Branchiostegals 5. Pseudobranchige well developed. Fins: The 

 caudal is deeply forked, its upper lobe a little the longest, 3.66 

 into length; the depth of the fork is 1.20 into head. Caudal 

 peduncle unarmed, its height is 4.50 into head. Soft dorsal and 

 soft anal of about equal length, but the dorsal is a little the high- 

 est; its longest ray is contained 2 into length of pecftorals. The 

 base of pectorals equal the diameter of eye. Color in spirits: Bluish, 

 the body covered with indistinct mottlings of j^ellowish spots and 

 lines, wider than the interspaces of blue ground color; lighter blue 

 on belly and thorax. The caudal in one specimen seems to be a 

 uniform dusky bluish; in the other there are indistinct blotches of 

 yellowish. Pectorals are yellowish, ventrals bluish ; dorsal and 

 anal dusk3\ the webs more or less yellowish white. Two specimens, 

 length lo-u inches. Guam, July 12, 1900. Hab. Western Pacific, 

 Polynesia, Marianas. 



Genus MONOCBROS Block. 



216-221. Monoceros garretti-' sp. uov. 



Head 3.50; depth 2; eye 3.50, 2 into snout; D. vi 28; A. 11 29; 

 V. I 3; P 16. Scales minute, rough. Body elevated and com- 

 pressed. Two bony plates on the caudal peduncle with short, sharp 

 keels. The yellow covering of the base sharply defined and sepa- 

 rated by a black line. The snout is concave, but the profile is 

 more rounded than in M. litiwatus. The distance from base of first 

 dorsal to the upper nostril is 1.33 into head. Mouth is perfe(5lly 

 horizontal on the median line. Teeth: A single series of sharp, 

 compressed incisors, not serrated, about 10 on each side of upper 

 jaw. Branchiostegals 4. Pseudobranchiae developed. F'ins: The 

 height of the fourth dorsal spine equal to length from its base to 

 anterior base of first dorsal spine. The first dorsal spine 2 into 

 head. The caudal fin is emarginate, the upper lobe slightly the 

 longest, its length 4.20 into height. lyOngest ray of pe(5toral 1.50 

 into head, its base 4.88. Longest ray of ventrals about equal to 

 pe(5lorals. The posterior margins of dorsal and anal forming acute 

 angles. Color in spirits is a uniform lamp-black with a slight wash 

 of neutral. There is a narrow yellowish green line extending down 

 each side the snout from anterior of orbit to form a more or less 

 complete circle on the lips. Two round yellow spots on caudal 

 peduncle forming the bases of the keels. The caudal is black with 

 a sub-terminal band of yellow, and a marginal band of white. The 

 dorsal is black with a sub-marginal line of white which begins very 

 narrow and gradually widens posteriorly to half the width of the 



^Nanied after Andrew Garrett. 



