146 ADDENDA. 



Page 70, after Gobius giuiis, 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. 



Page 71, to description of Gobius carrinus, 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. petersii. A renewed examination of the specimens in the 

 British Museum has not induced us to change our views as already expressed. 



Page 82, after Pomacentrus punctatus, add :— 

 283*. Pomacentrus trichourus, sp. n. Plate XVII. fig. 5. [484.] 



D- igrn- A-rPTs- ^. ^ a *- ^5. 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. 



