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 PLEBEIUS, 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 ossainnominata. Posterior margin of caudal sukxrescentic. 



&quot; Burnstickle&quot; of the English ; &quot; Sticklebacks&quot; of the American people. 



List of specimens. 



21. GASTEROSTEUS SERRATUS, Ayres. 

 General Report upon Wishes. 



Body entirely plated ; peduncle of tail keeled. Dorsal spines thre&amp;gt;e ; 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 &quot; Stickleback.&quot; 



List of specimens. 



