16 



ZOOLOGY. 



extending to a vertical line drawn posteriorly to the orbit ; opercle and preopercle spinous. 

 Origin of dorsal fin a little in advance of the base of the pectorals. Reddish brown above, 

 lighter beneath. 



This is a much rarer Rock Fish than the preceding ones. 



List of specimens. 



V. FAMILY GASTEROSTEIDAE. 



20. GASTEROSTEUS PLEBE1US, Grd. 



General Report upon Fishes. 



Body partly plated ; peduncle of tail not keeled. Dorsal spines three, of moderate develop- 

 ment, and strongly serrated upon their edges ; insertion of anterior one taking place immedi- 

 ately behind the base of the pectorals. Insertion of ventrals placed slightly in advance of the 

 second dorsal spine ; ventral spine serrated on both edges, its extremity not reaching the tips 

 of the ossa innominata. Posterior margin of caudal sul»crescentic. 



" Burnstickle" of the English ; " Sticklebacks" of the American people. 



List of specimens. 



21. GASTEROSTEUS SERRATUS, Ayres. 

 General Report upon Mshes. 



Body entirely plated ; peduncle of tail keeled. Dorsal spines three ; high and slender ; con- 

 spicuously serrated upon their edges ; anterior one inserted a little in advance of the base of the 

 pectorals. Insertion of ventrals situated a little in advance of the second dorsal spine ; their 

 own spine being serrated upon both edges, more conspicuously above than below, and extending 

 beyond the tips of the ossa innominata. Posterior margin of caudal concave. 



Another kind of "Stickleback." 



List of specimens. 



