160 CALIFORNIA ACADEMY OF SCIENCES. 
and xiii there are no connecting vessels. In xiv to xvii we find the dorsal vessel en- 
larged and folded on itself in a zigzag manner. Both hearts and dorsal vessels are 
thickly covered with chloragogen cells. I have already pointed out the absence of 
a continuous blood sinus in any of the various parts of the intestine. All the various 
organs of the body are thickly covered with blood capillaries, especially so the neph- 
ridia, spermathec, the clitellum, in which strong capillaries separate every two or 
three rows of the large clitellar cells. In the center of the tubercula pubertatis is 
always seen a dense mass of larger and smaller capillaries. 
A characteristic of the vascular system is also the great scarcity of blood 
glands, these being very numerous in Sp. Benhami. 
Sparganophilus sonome n. subsp. 
Figs. 123, 126. 
Habitat. Creeks and springs around Sebastopol, Sonoma County, California. 
Adult specimens very numerous in April. 
General Remarks. I consider Sparganophilus sonome as probably a sub- 
species under Sp. Smithi, which it resembles in most points, two of which are of 
the greatest importance, viz.: The position of the spermduct and spermiducal pore, 
and the duplication of the spermathece in several somites. But as long as I found 
the number of spermathec constant, and some other minor points of difference, I 
thought it best to describe this form more carefully, leaving the question of species or 
subspecies as a matter of choice, and for future consideration and study. 
EXTERNAL CHARACTERS. 
Tubercula pubertatis are the only external organs which differ from Sp. Smithi. 
While in Sp. Smithithey form a continuous ridge on either side, they are in Sp. sonoma 
broken up in numerous tubercles, generally two or three on each somite (fig. 125). 
I believe there is another characteristic worthy of mentioning. The single puberty 
groove is in the center of the tubercle, while in Sp. Smithi there are two grooves, one 
at the base on either side of the tubercle. But I freely confess that I have not sec- 
tioned up a sufficient number of specimens in order to know if these points are really 
constant, or if not rather they are subject to considerable variation. My supply of 
mature specimens of Sp. sonome was very limited, but in all I found the tubercula 
pubertatis broken into a succession of little knobs, but all together forming a ridge 
in outline like that of Sp. Smithi. 
INTERIOR CHARACTERS. 
Spermathece. While in all the specimens of Sp. Smithi I found eight sperma- 
thece in each of somites vii, viii, ix, the subspecies possess them as follows: Somite 
vi: one pair with the pore in front of seta 4. Somites vii, viil, ix: two pairs (4) in 
each, with pores in front of setee 4, and between 3 and 4. Each pair consists of two 
separate spermathecie, one of which opens in the intersegmental groove in front of 
seta 4, while the other opens similarly in front of a line drawn 4 the distance between 
sete 3 and 4, the 4 being towards 4 and the } towards 3. Both pairs are, therefore, 
