Report of a Mission to Gnavi. 107 



across the iuterorbital space, and another between the nostrils. 

 A simple reticulation of blue lines on the base of caudal fin. The 

 fins are all dark, the caudal with a slight wash of yellowish. This 

 species differs from the H. nicobarensis, Bl., before me in its shorter 

 head, longer spine, larger ej'e, and additional soft dorsal ray, one 

 less anal ray, and the markedly different arrangement and number 

 of the body markings. Length of specimen 3.50 inches. Agafia, 

 Guam, July 14, 1900. Tjpe specimen is No. 194, B. P. B. M. 

 Hab. Marianas. 



Family TBUTHIDID^.— Surgeon-fishes. 



Genus TEUTHIS Linn^us. 



195. Teuthis olivaceus Bl. 



Head 3.50, the profile rounded — the snout, however, is straight; 

 depth 2; eye 3.20 into head; D. ix 24; A. iii 22: \' . i 5. vScales 

 minute, ctenoid, about 20 between lateral line and dorsal. Teeth: 

 Sixteen broad flat teeth in the upper jaw, dentate at extremity; 

 about 14 in lower. Color: Dark brown; extending longitudinally 

 backwards from the upper articulation of the opercle is a bright 

 cadmium orange line (bluish in .spirits), about equal in length to the 

 .snout, and half as wide as the interorbital space. This blue line is 

 surrounded by a black zone of about the same width. There is a blue 

 .splotch just posterior to base of pedtoral fins; this splotch is com- 

 pletely hidden by the pe(5torals when they are pressed against the 

 sides of the body. The general color of fins is brown. The pecftorals 

 are broadly edged posteriorly with bluish white. The ventrals 

 have a trace of blue. The caudal fin is deeply lunate, the upper 

 lobe the longer; color entirely black, except the soft rays of the 

 middle, \yhich have a broad subterminal band of white, with a nar- 

 row terminal line of black. Caudal peduncle entirely brown, with 

 one movable spine which is equal in length to the width of the eye. 

 The pe(5toral fin is equal in length to the head. The ventrals are 

 considerabl)' shorter. The posterior edge of dorsal and anal form 

 acute angles. One specimen, length 6 inches, was secured inside the 

 coral reef, Agafia, Guam, July 15, 1900. Hab. Polynesia, Marianas. 



196. Teuthis mata Cuv. & Val. 



Head 3.50; depth 1.88; eye 3.50, 2 into snout; interorbital 3 

 into head; D. ix 26; A. iii 25; V. i 5; P. 16. Scales minute. The 

 spine on side of caudal peduncle short, about equal to one-half the 

 width of orbit; it is less than one-half the depth of the caudal 

 peduncle. Body compressed, elevated. The snout is straight; the 

 mouth is small, with about 9-10 elobate teeth on each side of 

 either jaw. Fins: The caudal is emarginate — the upper lobe the 

 longer — the outer rays somewhat prolonged, 2.50 in length. The 



