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 Brachionus. 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 
(Chaetonotus) 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. 
