Laguna @arine Laboratorp 81 
PULMONATA 
Two species of Limax are common both at Laguna Beach and 
Claremont. They have been provisionally determined by Mr. 8. 8. 
Berry, as Limax maximus Linn. and Limax flavus Linn. They differ 
in color, both being of a yellowish-gray, but Limav maximus is spot- 
ted and streaked with black, while Limax flavus has no black spots. 
There are also some anatomical differences. Limax maximus 1s, 
when fully grown, about two inches long; Limax flavus is somewhat 
smaller. 
c 
y° > y \ 
/ > \ 
Wh Y XX NAY 
= a \ \ } 1 ¢ : : 
A ays A ' cn AG, 
SoA \ q ~\ 
Ka iS V4 
o SY LW \ > IPQ 
j \* “\t 
—. Ces 
= 2 \ 
c VA < 
es ' 
Z 2 xe ¥) 
Figure 42. Circulation of Limax flavus 
Limax maximus L. 
(Figure 40) 
Limax flavus L. 
(Figures 41 and 42) 
PELECYPODA 
FILIBRANCHIATA 
Mytilus californianus Conr. 
(Figure 43) 
The species is gregarious, forming extensive mussel-beds on flat 
rocks exposed to the surf. There are several large colonies of them 
at Laguna, notably the one at Mussel Point, which furnishes to the 
villagers endless supplies for food and for bait. 
Mytilus bifurcatus Conr. 
More generally distributed along this coast than M. californianus. 
Sometimes very numerous on rocks uncovered at low tide. 
