344 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3 d Ser. 



EXPLANATION OF PLATE XX. 



All figures refer to Californian specimens of Chordodes occidenialis Montg. 



Figs. 15-20. Surface views of the cuticle of different individuals, fig. 20 from 

 a female, the others from males (obj. C, oc. 4). 



Figs. 21, 22. Transverse sections of the cuticle of a male and a female 

 (homog. immers. 1/12, oc. 2). 



Fig. 23. Female, ventral view of the posterior end (obj. A, oc. 2). 



