•146 
ADDENDA. 
Page 70, after Gobius giuris, add 
236*. Gobius obscurus. 
Gobius obscurus, Peters, Wiegm. Arch . 1855, p. 250; Steindachner , Verhandl. zool.-bot. Ges. Wien, 
1866, p. 780, pi. 18. f. 6. 
Zanzibar. Mozambique. 
Pago 71, to description of Gobius canillUS, add : — 
The African variety of this species appears to have been described by Dr. Steindachner 
(Verhandl. zool.-bot. Ges. Wien, 1866, p. 781, pi. 18. fig. 17) as a distinct species 
under the name of G. qjetersii. A renewed examination of the specimens in the 
British Museum has not induced us to change our views as already expressed. 
Pago 82, after Pomacentrus punctatus, add 
283*. Pomacentrus trichourus, sp. n. Plate XVII. fig. 5. [484.] 
D. A.p^jg. L. lat. 25. L. transv. 3/10. 
The height of the body is half of the total length (the caudal not included). The 
length of the head is contained thrice and a half in the same. Interorbital space 
scarcely convex, equal to the diameter of the orbit. Prseorbital irregularly serrated, 
half the width of the orbit. Prseoperculum coarsely denticulated. The dorsal spines 
increasing slightly in length posteriorly, the last being five-eighths of the length of the 
head. Caudal slightly emarginate. The second anal spine strong, and equal in length 
to one of the middle spines of the dorsal. The first ventral ray produced into a short 
filament. The free portion of the tail somewhat higher than long. 
Colour in life bluish grey, each scale with two bright blue spots, after death uniform 
brownish. Dorsal and anal with brown margins. Caudal bright yellow, with a broad 
greyish margin and a blackish base. A bright blue spot on the superior angle of 
operculum, becoming black in a preserved state. Base of pectorals black. — Length 
4| inches. 
Zanzibar. 
