124 NOMENCLATURE OF STIZOSTEBION— GILL. vol.xvii. 



come are embodied in the following analytical synopsis, slightly modi- 

 fied and extended from our early one. 



*. Dorsal fins well separated, the interspace between them more than the diameter of 

 eye; anal fin II, 11-14, longer than high; second dorsal I, 17, to I, 21; spines 

 of the second dorsal and anal closely attached to the soft rays; last dorsal 

 spine scarcely erectile, more or less firmly bound down by the membrane; 

 veutrals separated by an intersjiace equal to Avidth of their base; canine teeth 

 strong (American species) : 



t. Soft dorsal comparatively short (its base one-fourth shorter than that of spinous 

 dorsal) and with about 17 soft rays; cheeks, opercles, aiul top of head more or 

 less closely scaled; body scarcely compressed; size small; pyloric creca form- 

 ing two groups, the primary one of four, unequal, moderate, much shorter than 

 the stomach ; the secondary of few (1-3) rudimentary ones Canadense. 



ft. Soft dorsal rather long (one-sixth shorter than spinous dorsal, with about 20 soft 

 rays; cheeks and upper surface of head sjiarsely scaled; body more com- 

 pressed; size large; pyloric cn>ca three, subequal, all long (about as long as 



stomach) Vitreum. 



**. Dorsal fins approximated, almost connected by membrane, the interspace being 

 much less than the diameter of the eye; spines of second dorsal and anal 

 loosely connected with succeeding rays; last dorsal spine erectile; ventrals 

 separated by an interspace about two-thirds the width of their base; second 

 dorsal I (11,16) 22 or 23; anal fin at least as high as long; body compressed; 

 (European species with the body more or less distinctly transversely barred) : 



t. Soft dorsal considerably (one-fifth) shorter than spinous dorsal ; anal fin II, 11-12, 

 as long as high ; canine teeth strong; "pyloric cneca 4 to G" Ltu'Ioi'KRCA. 



tt. Soft dorsal somewhat longer than spinous dorsal; anal fin short and high ; its 

 length two thirds its height; its rays II, 9-10; canineteeth weak, not much dif- 

 ferentiated; body strongly compressed as in the genus Perca; "pyloric ca-ca 

 three" ( Giinther) Wolgense. 



tit. Second dorsal shorter than spinous dorsal (First D. XII-XIII; Second D. I-II 

 16-17); anal fin II, 11-12, about as short as high; canine teeth developed; 

 body compressed and banded like a perch; pyloric ccpca 5; the longest as long 

 as stomach, the shortest only half as long ( Boulenger) Makixum. 



The relations of Stizostedion to other genera appear to me to have 

 been much misunderstood. Dr. Giinther and Prof. Seeley have arranged 

 the fresh-water European genera of perciforni acanthopterygians in the 

 following manner: 



G Onther, 1859 ( 1886 * ). Seeley, 1886. 



1. Perca. 1. Peica. 



4. Labrax. 2. Labrax. 



9. Acerina. 3. Percarina. 



10. Percarina. 4. Acerina. 



11. Lucioperca. 5. Lucioperca. 

 14. Aspro. 6. Aspro. 



Most of these genera are undoubtedly related, and belong to the 

 family Fercidcc, but Labrax (including Dicentrarchus, Eoccus, and 



* The same essential sequence was adopted in the Handbuch der Ichthyologie, but 

 without numbers. 



