86 
LABEIM. 
suboperculum, and the upper part of the interoperculum scaly ; the last is as broad as 
the diameter of the eye. Dorsal spines stout, the longest being one-fifth of the length 
of the head ; they increase in length posteriorly. Third anal spine longest ; it is equal 
to the third of the dorsal, and is contained five times and a half in the length of the 
head. Caudal truncated. First ventral ray produced. 
Colour rosy; a series of bright-blue spots on the back, close to the base of the 
dorsal, and two or three more or less indistinct longitudinal series of pearly spots along 
the sides. Axil of pectoral blue. A greenish blotch on the posterior part of the oper- 
culum, and a broad blue patch on the inferior half of the prseoperculum. An indistinct 
blue band round the orbit, continued on the snout to about the middle of the maxillary. 
Lower lip bluish, with a very faint blue band parallel to it lower down. 
Length 7 inches. 
Zanzibar. 
PTERAGOGUS, Peters. 
295. Pteragogus tseniops. [266, 476.] 
Cossyplius taeniops, Peters, Wiegm. Arch. 1855, p. 262. 
Pteragogus tseniops, Giinth. Fish. iv. p. 102. 
D. A. §. L. lat. 23-25. 
Very similar in general appearance to Duymceria , but differing from it in the 
formula of the fins ; the first ray of the ventral also is much more produced than the 
lobes of the dorsal. 
The height of the body is contained twice and two-thirds, and the length of the head 
four times in the total length. Two posterior canine teeth in the upper jaw. The 
vertical limb of the prseoperculum distinctly serrated. The lobes of the anterior dorsal 
and anal spines are very slightly produced ; the spines of the former increase in length 
posteriorly. The first ventral ray is much produced, and reaches to the middle of the 
anal. Caudal acutely rounded. 
Colour in life violet, variegated with darker and lighter, and covered with numerous 
faint blue spots. A Y _s h a P e( f darker mark between anterior margins of orbits and 
front of snout ; a similarly coloured band between the posterior margins of orbits, and 
a vertical band with lighter edges from base of orbits to posterior joint of lower jaw ; 
a narrow blue line parallel to the denticulated limb of prseoperculum ; a rectangular, 
black, light-edged spot between the first and second dorsal spines ; the rest of that fin 
is marbled with red, white, and brown, and has an orange margin. A black spot on 
base of pectorals. 
Length 5-| inches. 
Zanzibar. Mozambique. 
