ADDENDA. 



Page 3. Gasterosteus aculeatus 

 appears to be found in Iceland. — Cfr. Faber, Fische Islands, p. 129. 



Page 4. Gasterosteus argyropomus. 



The amended diagnosis is — 



D. 1 I 1|^. A.i P. 9. Vert. 1/1. 



Body •without any plates. Dorsal spines short, serrated. Insertion 

 of the ventrals rather nearer the fii'st dorsal spine than the second ; 

 their extremities reach to the tip of the ventral plate. The posterior 

 margin of the caudal fin truncated. 



Page 4. 2 a. Gasterosteus williamsoni. 



Girard, U. S. Pacif. R. R. Kr/ml. Fishes, p. 93, and Proc. Ac. Nat. 

 Sc. Philad 1854, p. 133. 



D. 1 I l|^. A. 1/7. 



Body without any plates. Dorsal spines exiguous and slender, not 

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

 dorsal spine, their extremities not reaching the tip of the ventral 

 plate. The posterior margin of the caudal fin suhcrescentic. (Qir.) 



Williamson's Pass (California). 



Page 8. Add to the Si/no2')sis of the Genera : — 



Two dorsals. Neither prajopercular nor ven- 

 tral spine ia. IIeterophthalmus. 



Two dorsals. Prreopercular spine none ; one 



ventral spine 7. M'i'RipniSTis. 



Page 12. Add another genus of BERYCID.5: :— 



4 a. HETEROPHTHALMUS. 



IIeterophthalmus, Blceker, Act. Soc. Sc. Indo-Nederl. i. Manaclo en 

 Makuss. p. 42. 



Muzzle very short, tiimcated, -with the jaws nearly equal. Eye 

 very large. ViUifonn teeth in the jaws and on the palatine bones. 



