]ir WILLIAM A. HASWELL, M.A., B.SC. 11 



Balfour's researches, it would naturally be supplied by branches 

 from most of the spinal nerves belonging to those segments j 

 and, as the base of connection of the fin with the body became 

 narrowed, these nerves would be brought into closer connection 

 with one another, and wonld assume the appearance of converg- 

 ing towards the axil of the limb. The fact that the nerves which 

 go to supply the limbs originate from a number of spinal nerves 

 would thus seem to afford an additional argument in favour of 

 this view of the origin of limbs, and against the theory put 

 forward by G-egenbaur that the limbs are modified branchial 

 arches. 



Explanation of Plate I. 



Eig. 1. — Left pectoral fin of specimen 1. 



,, 2. — Pectoral fin of Ceratodus, after Huxley. 



„ 3. — Pelvic fin, after Griinther. 



,, 4. — Right pelvic fin of specimen 1. 



„ 5. — Left pelvic fin of specimen 1. 



„ 6. — Left pelvic fin of specimen 2. 



,, 7. — Eight pelvic fin of specimen 2. 



Notes on the Plefkonectid^ of Poet Jackson, with 

 descriptions of two hitherto unobserved species. 



By "William Macleat, P.L.S., &c. 



Fishes of this family are rarely seen in the Sydney Market, 

 and the species most frequently seen and generally known as the 

 "Plounder," cannot, in point of quality as food, be compared 

 with the Turbot, Sole, or other Pleuronectidce of cooler seas. But 

 it by no means follows that, because our fishermen do not catch 

 them, they are really rare or of a quality inferior to the Flat Fish 

 of other parts of the world, indeed I believe that in this Paper I 

 shall be enabled to prove the contrary. 



