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Show 164 THE BLOOD-CORPUSCLES OF BATRACHIANS. [Feb. 4, Lissotriton punctatus Nucleus Triton bibronii Nucleus cristatus Rana esculenta temporaria T -i-. *• 7112* Nucleus Tadpole % inch long Bufo vulgaris T -^ x * 5627* Nucleus calamita viridis , Bombinator igneus Pelodrgas cceruleus 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 Proteidae, 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 Lepidosiren 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 perenuibrancbiate 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 observations than we yet possess would be required to determine what degree of truth there may be in this tenet. Though it is commonly adopted, L.D. 800 1 1778 _1_ 848 1 1901 idem l 1000 1 1108 1 3114 1 1098 1 1043 1 2802 1 1333 idem idem l 1231 S.D. l 1280 1 2667 1 1280 1 3000 idem l 1445 l 1821 1 6297 1 1650 1 2000 1 S261 1 1895 idem idem l 2000 |