ADDENDA 



Page 3. Gasterosteus aculeatus 

 appears to be found in Icoland. — Cfr. Falxr, Fische hhinds, ]). 129 



Pago 4. Gasterosteus argyropomus. 

 The amended diagnosis is — 



I^-M l|l^- ^-h- l*-'^- ^ert.l/]. 

 Bo<ly wathout any plates. Dorsal spines short, serratc^d. Insertion 

 of the ventrals rather nearer the first dorsal s])ine than (lie second ; 

 their extremities reach to the tip of the ventral plate. Tlic pnstcrioi 

 margin of the caudal tin truncated. 



Page 4. 2 a. Gasterosteus williamsoni. 



(iirard, IT. S. Parif. E. It. llrpcd. Ft'slics, p. !);>, and Pmc. Jr. A,il 

 Sc. Philad. 1854, p. 133. 



D. 1 I 1 |±. A. 1/7. 



Body without any plates. I)oi-sal spines exiguous and sk>ndcr, not 

 serrated. Insertion of the ventrals slightly in advance of the secojul 

 dorsal spine, their extremities not reaching the tij) of tlie V(Uitral 

 jdate. The posterior margin of the caudal fin subcrcscentic. {Oir.) 



Williamson's J*ass (California). 



Page 8, Add to the Sijimpsis of the Genera : — 



Two dorsals. Neither praioporcular nor ven- 

 tral spine 4,/. IIicTEnopHTHAi.Mis. 



Two dorsals. Procoporcidar spine none ; one 



ventral spine 7. M-iiiiPRiSTis. 



Page 12. Add another genus of BERYCID^ : — 



4 a. HETEROPHTHALMUS. 



Ileterophthalmus, Bkekcr, Act. Site Sc. Imh-Kedcrl. i. 3[(tnndo oi 

 Mahass. p. 42, 



Muzzle very short, truncated, wnth the jaws nearly equal. Eye 

 very large, Villiform teeth in the jaws and on the palatine bones. 



