342 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Sek. 



EXPLANATION OF PLATE XIX. 



(All the outlines were drawn with the aid of the camera lucida and a Zeiss 

 microscope and lenses. The cuticle is represented as seen in Canada bal- 

 sam, after clearance in cedar oil.) 



Gordius longareolatus, sp. nov., type. Head end (obj. A, oc. 2). 



Idem. Ventral view of posterior end (idem). 



Idem. Lateral view of the posterior end, the ventral side to the 



left (idem). 

 Idem. Surface view of the cuticle, the arrow denoting the line of 



the longitudinal axis of the body (obj. C, oc. 4). 

 Idem. Transverse section of the cuticle (homog. immers. 1/12, 



oc. 2). 

 Chordodes occidentalis Montg., dorsal view of the head of a female 



(obj. A, oc. 2). 

 Idem. Surface view of the cuticle (obj. C, oc. 4). 

 Idem. Transverse section of the cuticle (homog. immers. 1/12, oc. 



4, tube length 180 mm.). 

 Idem. Lateral view of the posterior end, the ventral side to the 



right (obj. A, oc. 2). 

 Chordodes occidentalis Montg., male. Lateral view of the head 



end (obj. A, oc. 2). 

 Idem. Transverse section of the Cuticle ; in this figure, as in the 



following, dirt granules are imbedded between the areoles 



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

 Idem. Surface view of the cuticle (obj. C, oc. 2). 

 Gordius aquatic us Linn., male from Berkeley, California. Sur- 

 face view of the cuticle ; the intersecting clear lines transverse 



the white spots (obj. C, oc. 2). 

 Fig. 14. Idem. Surface view of the body, as seen with low magnification 



(obj. A, oc. *2), to show the arrangement of the white spots. 



The continuous lines represent the outlines of the body, the 



dotted lines the area to which the drawing was limited. 



lug. 



1. 



Fig. 



2. 



Fig. 



3- 



Fig. 



A- 



Fig. 



5- 



Fig. 



6. 



Fig. 



>■ 



Fig. 



8. 



Fig. 



9> 



Fig. 



10. 



Fig. 



11. 



Fig. 



12 



Fig. 



13. 



