164 THE BLOOD-CORPUSCLES OF BATRACHIANS. [Feb. 4, 



L. D. S. D. 



1 1 



Lissotriton punctatus §00 1280 



Nucleus 1773 2667 



11 



Triton bibronii §48 1280 



Nucleus j9oi _§5oo 



cristatus idem idem 



Rana esculenta fooo 1445 



* . 11 

 temporaria 1103 1821 



T J-. 



7112 1 1 



Nucleus 31li 6297 



Tadpole £ inch long . . m& 1655 



Bufo vulgaris 10J3 2000 



i- 5627' 

 Nucleus 2802 526i 



calamita 1333 jggs 



viridis , idem idem 



Bombinator igneus idem idem 



Pelodryas cceruleus 12^1 2000 



The number of animals in the above Table being insufficient to 

 warrant peremptory generalizations, which might not prove good 

 against further observation, we can at present merely note what is 

 indicated by these measurements ; and the results conform generally 

 to those already published (scattered and piecemeal), but not, it would 

 seem, commonly realized by physiological writers. 



1 . The largest red blood-corpuscles belong to the Proteidse, and 

 the largest of all to Amphiuma of this family. 



2. The smallest corpuscles occur in the Frogs and Toads, and the 

 smallest of all in some species of Bufo, though the common Toad 

 has slightly larger corpuscles than the common Frog. 



3. The corpuscles are much larger, without exception, in the 

 Urodela than in the Anura. 



4. The difference between the corpuscles of Siredon and Lepido- 

 siren is scarcely appreciable or nought, save that the nucleus is 

 smallest in the former. 



5. Amphiuma and Sieboldia, both caducibranchiate species, have 

 much larger corpuscles than the perenuibranchiate Siredon. 



6. The corpuscles are not so large in Sieboldia, which is the 

 largest species, as in Amphiuma and Proteus, which are much smaller 

 species ; and so, too, of Triton and Lissotriton. 



Finally, Rudolph Wagner held that the greatest magnitude of the 

 corpuscles is related to the persistency of the gills. More observa- 

 tions than we yet possess would be required to determine what degree 

 of truth there may be in this tenet. Though it is commonly adopted, 



