274 Fretp Museum or Naturat History — Zo6étocy, Vor. X. 
This genus differs from Cheirodon in the peculiar scaling on the 
lower half of the base of the caudal fin of the male, and also in the 
non-projecting interhemal spines of the caudal peduncle. 
25. Compsura gorgonz (Evermann & Goldsborough). 
Cheirodon gorgone Evermann & Goldsborough, Proc. Biol. Soc. Wash., 
XXII, 1909, 99, figs. 1 and 3 (Gorgona, Atlantic slope, Paaking 
Canal Zone). 
Cheirodon insignis Eigenmann, Memoir. Carnegie Mus., VII, 1916, 69 
(in part). 
Head 3.7 to 4.25; depth 2.55 to 3.3; D. 10 or 11; A. 16 to 20; scales 
31 to 33. 
Body rather short, compressed; profile gently convex from snout to 
dorsal; head small; snout short, 4.1 to 5.4 in head; eye 2.6 to 3.25; 
interorbital 3.1 to 3.6; mouth small; jaws subequal; maxillary reaching 
anterior margin of eye; premaxillary teeth usually 10 in number, each 
tooth with about 6 cusps, the median cusps considerably enlarged; 
FiG. 2. FRONT TEETH OF Compsura gorgone (Evermann & Goldsborough). 
(After Evermann & Goldsborough.) 
maxillary usually with 2 teeth, similar to the premaxillary teeth; teeth 
in lower jaw usually 12 in number, close together, the expanded tips 
slightly overlapping, each with about 6 cusps, the median ones only 
slightly enlarged, making the margin evenly convex; lateral line in- 
complete, present on 5 to 13 scales; scales thin, striate, 10 to 12 in 
advance of dorsal; 8 to 10 rows between dorsal and adipose; dorsal fin 
pointed, the anterior rays the longest, its origin midway between tip of 
snout and base of caudal; adipose fin over last ray of anal, notably 
nearer base of caudal than dorsal fin; caudal fin naked, the lower lobe 
the longer; origin of anal under last rays of dorsal, its base considerably 
shorter than depth of body; ventral fins inserted a little in advance 
of dorsal, reaching nearly or quite to origin of anal; pectoral fins some- 
what longer than ventrals, usually not quite reaching the base of the 
latter. 
Color silvery, with a narrow plumbeous band; a very conspicuous 
black oval caudal spot, not extended on caudal rays. Head and body 
