140 PROCEEDINGS OF THE ACADEMY OF [1883. 



The Upper Klamath Lake is more prolific in animal life than 

 any body of water known to me. The proportion of alkali which 

 it contains appears most favorable to the development of life. 

 Its waters are full of vegetable impurities, living and dead, and 

 mollusca and Crustacea abound everj'where. These sustain a 

 great population of fishes, which, though not numerous in species, 

 is so in individuals. Swarms of fishing-birds employ themselves 

 in catching them living from the lake. The most abundant mol- 

 lusca are the Planorbis ( Garinifex) newherryi Lea, and a Lymnsea. 

 A probably hydroid polyp is found attached to the bark of 

 submerged trees in large numbers. Its creeping yellowish stems 

 are imbedded in sarcode, forming a continuous mass. Each 

 zooid is of an elongate oval form, sessile, and with six rays of 

 equal size, each one-half as long as the body. These zooids are 

 translucent, but with two oval bodies in the lower half of the 

 body-cavity, of a yellow color. The masses are as large as the fist. 

 The length of each zooid is one millimetre. They did not extend 

 themselves beyond this length, neither did the rays elongate to 

 beyond half the same, so long as I observed them. They retracted 

 themselves on being irritated. They do not possess any fringes 

 like the arms of the Polyzoa. As the possession of a coencecium 

 distinguishes this genus from all the fresh-water hydroids, I pro- 

 pose to characterize this remarkable form as the type of a new 

 genus, with the name of Bhizohydra, and the species, by the name 

 of Jlamtincta} 



The following mollusca which I obtained were identified by 

 Mr. Trj^on, to whom my acknowledgments are due : — 



Ancylus newherryi Lea. 



Limnsea stagnalis Lea. 



Physa gyrina Say. 



Pompholyx effusa Lea. 



Planorbis corpulentus Saj'. 



Garinifex newherryi Lea. 



Anodonta wahlamatensis Lea. 

 In my explorations of these lakes, I was greatly aided by Col. 

 "Whipple, in command at Fort Klamath, and Col. Barnard, in 

 command at Fort Bidwell, and Dr. George Kober, surgeon at the 



^ My attempts to preserve some of the masses of this animal in alcohol 

 were not successful. 



