334 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



here mentioned only briefly, the reader is referred to my 

 previous paper, 1. c. In this Key the females of Gordius 

 aquaticus difficilis, G. longareplatus, n. sp., Chordodes fuer- 

 ilis, and the male of C. morgani find a place, though I have 

 seen only the males of the first three mentioned, and the 

 female of the last; this was done with the assumption that 

 the cuticular characters of the two sexes are similar in 

 these forms. 



It is here shown that Chordodes gordioides Montg. is 

 identical with C . occidentalis Montg. 



1. Gordius longareolatus, sp. nov. 



Type. — Coll. Cal. Acad. Sci.: 1 S , San Francisco, Cal., Sept. io, 1896. 



Form. — Of equal diameter in its whole length, nearly cylindrical, with faint 

 median grooves. Head end (fig. 1) conically rounded, the tip slightly con- 

 stricted off, mouth ventral (on the ventral side of the white tip of the head). 

 Tail lobes (figs. 1, 3) short, thick, nearly parallel, terminally rounded. Their 

 point of bifurcation (on the ventral surface) is at a distance from the oval 

 cloacal aperture about equal to the length of the lobes. Each lobe is approx- 

 imately cylindrical, except on its median surface which is concave ; this con- 

 cavity is deepest nearest the posterior end of the lobes and is bounded by a 

 sharp line. The cloacal aperture is situated upon a slightly elevated papilla ; 

 from this papilla to the point of bifurcation of the tail lobes extends a deep 

 groove( deepest caudad). The area around the cloacal aperture, and extend- 

 ing caudad to about the point of bifurcation of the tail lobes, is covered with 

 numerous, minute, conical spines. 



Cuticle. — With elevated areoles of elongate form, their longitudinal axes 

 parallel to that of the body (fig. 4). The areoles do not produce particular 

 longitudinal rows, though everywhere the spaces which separate them are 

 about equal in length. They are darker than the intermediate portions of 

 the cuticle. Most of them are several times longer than broad, with nearly 

 parallel margins ; a smaller number are shorter and thicker, but even these 

 are somewhat elongate. On cross section of the body (fig. 5) the areoles are 

 seen to be hyaline and homogeneous, their darker, denser bases sunk into 

 the surface of the fibrous cuticle. On section they show a rounded-conical 

 form, without any median groove. No hairs lie between the areoles, but 

 widely separated from one another are found a few hyaline, finger-shaped 

 processes, of slightly greater elevation than the areoles ; such processes have 

 heretofore been noticed by me only in the genus Chordodes. 



Color. — Deep olive brown, slightly iridescent ; the tip of the head white. 



Dimensions. — Length, 115 mm.; greatest diameter, 0.5 mm. 



