834 MR, GULLIVER ON THE RED CORPUSCLES [Nov. 19, 



have yet examined of the osseous fishes. Referring to my MS. 

 notes, and to my papers in the ' Proceedings of the Zoological 

 Society,' February 22, 1848, and February 25, 1862, both of which 

 were published since my Tables of Measurements in the Sydenham 

 Society's edition of Hewson's Works, these blood-corpuscles of the 

 genera Salmo and Thymallus appear to be at least a third larger than 

 the corresponding corpuscles of most other osseous fishes. The fact 

 seemed so remarkable and exceptional as to require further observa- 

 tions ; and, accordingly, I have lately again obtained blood from 

 fresh salmon and trout, and carefully measured the red corpuscles, 

 and compared them with my old dried specimens from the same 

 species of fish. 



The results have all proved in the affirmative. They are noted 

 below, like all my other measurements, in vulgar fractions of an 

 English inch, and include, for the sake of comparison, measurements 

 made at the same time of the red blood-corpuscles of a few other 

 osseous fishes. Only the average sizes are given ; and the long dia- 

 meters are denoted by L. D., and the short diameters by S. D. 



L. D. S. D. 



Salmo fontinalis ^~ ^^ 



Salmo solar ^ ~ 



Salmo fario ±L 2L 



Salmo ferox ^ JL 



Thymallus vulgaris ~ ^ 



Osmerus eperlanus ^ S555 



Clupea harengus ^m dss 



Clupea pilchardus ^33 ^ 



Cyprinus cephalus ~m ^L 



Gadusluscus ^0 JL 



Platessaflesus 5^6 3^3 



Caranx trachurus good ^- 



Trigla hirundo ~ 35k 



Syngnathus typhle JL JL 



Conger vulgaris JL JL 



Anguilla vulgaris ~ J^ 



Ammodytes lancea JL si 



Hence it appears that, among these osseous fishes, the blood-disks 

 of the Salmonidce are the largest ; and this fact will appear still wider 

 on a comparison with an extended and revised version of my Tables 

 of Measurements, which is now being prepared for publication. The 

 blood-disks of the Salmons are, indeed, so nearly of tbe same size as 



