R. H. Chittenden— Flesh of Hippoglossus Americanus. 123 



1. Lepidodendron. The forms of Lepidodendron are the 

 most abundant and widely distributed. They are all character- 

 ized by small leaf-scars. 



2. Palceopteris. This shows two types. By far the most 

 abundant and widely distributed is the form with narrow ellip- 

 tical leaflets, like P. Jacksoni. We find much less abundantly, a 

 second type with broad I i ke Palceopteris oblusa. 



3. Triphyllopteris. To this, I consider Mr. Meek's Cyctop- 

 teris Vuyiniana, and C. Lesueuriana, as belonging. The latter 

 plant, with possibly a similar species, is widely distributed and 

 very abundant in some localities, forming all the impressions 



I have nowhere seen any impressions of Sigillaria, Calamites, 

 Sphenoptens. and others of the most common plants in the pro- 

 ductive coal-measures. In only one case have I seen a speci- 

 men of Neuropteris, and this was a remarkably fine one, of N. 

 fiexuoaa, iound at Lewis Tunnel. This place has yielded a 

 much greater variety of plants than any other locality visited 

 by me. Of course this negative evidence, in the absence of 

 extended exploration, cannot be taken as excluding the former 

 presence of these plants in the Vespertine. Still it is peculiar 

 that with the many hundreds of specimens seen at widely dis- 

 tant localities, none of those plants noted above as not seen, 

 should have been met with. 



Art. XV. —Contributions from the Sheffield Laboratory of Yale 

 College. No. XLL— On the Chemical composition of the flesh 

 of Hippoglossus Americanos ; by E. H. Chittenden. 



The Hippoglossus Americanus of Gill, or halibut as the 

 fish is comn ind in the waters of the Atlantic 



ocean from Newfoundland to Cape Hatteras. The halibut 

 belongs to the class of white-blooded fish, of which the Met- 

 1'inyiis vulgaris, or whiting, is a typical representative. The 

 flesh of the halibut is of a fine white color, quite delicate and 

 tender, and is highly valued for food, especially in certain 

 portions of the United States. 



A fresh sample obtained at the market yielded by analysis 



No. 1. No. 2. 



Water 82-85 82-90 



