344 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



head-quarters of the toads and moccasins ; the Sonoran is 

 the centre of variation of toads, Scelopori, horned lizards, and 

 rattlesnakes. A great number of species is confined to this 

 division. The snake-like batrachians belong exclusively to 

 the Austroriparian district, the range of the genus Siren be- 

 ing co-extensive with its boundaries. A few Mexican genera 

 extend east along the Gulf as far as Florida, and a few others 

 of Sonoran character extend south into Mexico. The Lower 

 California district is peculiar in its boaeform serpents and 

 large iguanas. 



On the whole, the North American fauna is peculiar in its 

 salamanders ; Old World in its frogs and most of its turtles ; 

 and South American in most of its snakes and lizards, and 

 some of its turtles. 



REPORT OF THE OCCURRENCE OF LARGE COD-FISH OFF 



HAZATLAN. 



Land and Water refers to the occurrence of some large 

 cod-fish off Mazatlan, West Mexico, as having been caught 

 in June, 1873, by officers of the British ship Scylla. The 

 largest of these fish measured six feet in length and weighed 

 230 pounds, the others being of different magnitudes down 

 to 85 pounds. This statement, however, requires confirma- 

 tion. It is a question whether the fish were really cod, or 

 some other fish of more tropical habit more or less resem- 

 bling it. 2 A, January 2, 1875, 6. 



GRAYLING IN" THE AU SABLE RIVER, MICHIGAN. 



The discovery of the grayling in the waters of the Au Sable 

 River of Michigan, some years ago, has attracted much atten- 

 tion to this locality recently, and induced efforts to secure 

 and multiply this fish in some more southern waters. Our 

 knowledge of this species is due mainly to Mr. D. H. Fitzhugh, 

 of Bay City ; and by his invitation Mr. Fred Mather, the well- 

 known fish-culturist, of Honeoye Falls, New York, visited the 

 locality in his company on the 1st of April, 1874, but found 

 that the eggs were not then ripe. On the 1st of May Seth 

 Green went to the same region, at which time the fish had 

 all spawned. He, however, dug out from the gravel about 

 one hundred eggs, which lie gave to Mr. Collins, of the Cale- 

 donia fish farm, to hatch out. These grew slowly at first, 



