Pomona College, Claremont, California 73 



There were one-half more rotifers in Claremont than Laguna. However, Laguna 

 had in comparative abundance the very interesting form, Rotifer neptunis. This form 

 is quite long and slender when extended, with two rosettes of cilia and a quite 

 unmistakable Neptune's trident at the end of the tail. It is very collapsable, telescoping 

 down to one-third of its extended length. This was peculiar to the smaller Laguna 

 Lake. 



Claremont showed several specimens of Brarh'wnus. I am not certain of the 

 species but the name must stand for want of a better one. It was a large form with 

 two magnificent wheels of cilia and two short slender arms, each bearing a tuft of 

 cila. When the animal drew in the wheels of cilia at least one of these arms 

 remained exposed. It was rather sedentary, fastening its two small toes to a piece 

 of algae and bending its flexible, stout body in different directions to search for food. 



Only one Gastrotricha was found in the Claremont region while this same genus 

 (Chaetonolus) was found in two different places and more than one individual 

 was seen. 



Microscopic Crustacea were rather rare, only one (Cyclops) being found in the 

 Sulphur Spring at Laguna. Three other kinds were found in the Claremont region, 

 two in the South Hills, the other at Puddingstone Canyon and in the Puente Hills. 



One water mite was found in Claremont in a temporary pool and in no other 

 place. 



The comparison between the temporary and permanent pools is not adequate on 

 account of the scarcity of data. In a general way, there is a smaller variety and 

 number of forms in the temporary than in the permanent pools. Streams and perma- 

 nent pools are similar in the amount of life they contain. 



