Kendall — Noteson Percopsis gvlttatus and Salmo omiscormycus. 4Tt 



of living specimens, which I kept alive for some time; and, 

 observing the great translucency of the living fish when held up 

 toward the light I gave it the specific name of pellucida, having 

 previously called it, in my journal, eoceta, from its wing-like 

 pectoral fins. 



" About this time I noticed, in the proceedings of the Boston 

 Society of Natural History, that Professor Agassiz had laid 

 before the Society an account of a new genus of fishes dis- 

 covered by him in Lake Superior, which he proposed to call 

 Percopsis. Suspecting, from the brief description given of it, 

 that it was identical with my Salmoperca, I wrote to Dr. Storer 

 and inquired of him if the specimens from Lake Superior pre- 

 sented to the Society by Professor Agassiz were like the one I 

 put into his hands in 1847. He wrote me that he could not 

 say — that the specimen went out of his hands soon after he 

 received it and he had not seen it since. 



" In Professor Agassiz's Lake Superior, page 248, I find an 

 account of his genus Percopsis and his species P. guttatas, and I 

 have no doubt that it is identical with my Salmoperca pellucida. 

 Still, I have thought it best to let it remain, in this Appendix 

 under the name I had given." 



Since Agassiz first named this species the name has withstood 

 the vicissitudes that taxonomy has so frequently meted to many 

 other systematic names of fishes as well as other animals. 



It is perhaps unfortunate that the nomenclatural rules of 

 priority of publication are so hard and fast that Thompson's 

 name for this fish could not have been retained, in justice to 

 Mr. Thompson. It is surely unfortunate that those same rules 

 require a name however barbarous and unmeaning to be 

 accepted if it has proper qualifications of form and priority of 

 publication . 



Accordingly it comes about that another specific termination 

 antedating both Agassiz and Thompson, for the genus Percopsis, 

 must be substituted for that of guttata*. 



In 1784 was published the Introduction to Arctic Zoology by 

 Thomas Pennant. In the list of Fishes of Hudson's Bay 

 appears on page CXCII : ' The Omisco Mai/cus is a new species 

 of trout taken in May in Albany River, not exceeding four 

 inches and a half long. It has five branchiostegous rays: first 

 dorsal fin has eleven rays, ventral eight, anal seven, pectoral 

 thirteen: tail forked: in the jaws are minute teeth: back, as 



