GENERAL NOTES AND FAUN^. 
93 
this region. He draws attention to the surprising fact that 
a number of common European marine fishes, which hitherto 
have never been met with between the tropics, reappear in tem- 
perate seas of the southern hemisphere. P. Z. S. 1871, pp. 653 
et seqq. 
Prof. E. D. Cope has read a paper before the American Asso- 
ciation for the Advancement of Science, published in Amer. 
Natur. 1871, v. pp. 579-593, and in Tr. Am. Phil. Soc. xiv. pp. 
445-461, and entitled Observations on the systematic rela- 
tions of the Eishes.^^ The author having purchased Prof. HyrtPs 
collection of 800 skeletons of fishes, and made it the base of his 
researches into the osteological characteristics of the class, has 
recognized the necessity of breaking up Muller^s subclass of 
Ganoids, and of introducing several other radical changes into 
the system, as will be seen from the following arrangement pro- 
posed by him : — 
I. Subclass IIOLOOEPHALI. 
II. 
n 
SELACHII. 
III. 
o 
DIPNOI. 
IV. 
o 
CROSSOPTERYGIA. 
V. 
)) 
AOTINOPTERI. 
A. Tribe Ohondrostei. 
1. Order Selachostomi (Spatularia). 
2. „ Glaniostomi (Sturgeon). 
13. Tribe Physostomi. 
* A prsecoracoid arcb. 
t A coronoid bone. 
3. Order Ginglymodi (the bony Gar). 
4. „ Halecomorphi (Amiidse). 
ft No coronoid bone. 
0. No symplectic bone. 
5. Order Nematognathi (Cathshes, descendants of the Sturgeons; 
3 families : Siluridae, Aspredinida3, Hypophthalmidae). 
6. Order Scyphophori (Mormyri and Gymnarchm). 
00. Symplectic present. 
7. Order Plectospondyli (Catostomidae, Cyprinidae-|-Cobitidae, Sterno- 
pygidae, Characiuidae -f Erythrinidae). 
8. Order Isospondyli (Notop teridae, Hyodontidae + Albulida 3 + Elopidae, 
Aulopidae-|-Coregonid 8 e 4 -Eutodirida 0 ,Saurida 04 -Gonorhyncliidae, 
Alepocephalidae-fSalmonidaB, Ohirocentridae 4- Clupeidae, Osteo- 
glossidae, Heterotidae-f Galaxiidas). 
** No praecoracoid arch. 
t Scapular arch suspended to cranium. 
0. A symplectic. 
9. Order Ilaplomi (Esocidas, Umbridae, Cyprinodontidae + Hypsaeidae). 
10. „ Glanencheli (Electric Eel). 
00. No symplectic. 
11, Order Ichthyocephali (Java Eels). 
