160 CAMFORNIA ACADEMY OF SCIENCES. 



aiitl xiii there are no connecting vessels. In xiv to xvii we find the dorsal ves.sel en- 

 larged and folded on itself in a zigzag tnaiincr. Hotli hearts and dorsal vessels are 

 thickly covered with ehloragogen cells. 1 have already pointed out the absence of 

 a continuous lilond sinus in any of the various parts of the intestine. All the various 

 organs of the body are thickly covered with blood capillaries, especially .<o the iieph- 

 ridia, sj)erniatheca', 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 sonomse n. subsp. 

 Figs. 123, 12G. 



Habitat. Creeks and springs around Sebastopol, Sonoma County, California. 

 Adult specimens very numerous in April. 



General Remarks^. I consider tSpar(/nnophihts sonomfn as probably a sub- 

 species under Sp. Sinithi, which it resembles in most points, two of which are of 

 the greatest importance, viz.: The position of the sperraduct and spermiducal pore, 

 and the duplication of the spermathecse in several somites, liut as long as I found 

 the number of sperinatheca^ constant, and .some other minor points of difference, I 

 thought it best to describe this form more carefully, leaving the rjucstion of species or 

 subspecies as a matter of choice, and for future consideration and study. 



EXTERNAL CHARACTERS. 



Tubercula pubertatia are the only external oi-gans which differ fi-oni Sp. Smithi. 

 While in Sp. Smithi they form a continuous ridge on either side, they are in Sp. aonomm 

 broken \\\) in numerous tubercles, generally two or three on each somite (tig. 123). 

 I believe there is another characteristic worthy of mentioning. The single puberty 

 groove is in the center of the tubercle, while in Sp. Sm'Uld 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 lo know if these points are really 

 constant, or if not rather they are subject to considerable variation. My sup|)ly of 

 mature specimens of Sp. mnoma> was very limited, but in all I found the tu!)ercula 

 pubertatis broken into a succession of little knobs, but all together forming a ridge 

 in outline like that of Sp. Smiihi. 



INTERIOR CHARACTERS. 



Spermatheae. AVhile in all llie specimens of Sp. Smithi I found eight sperma- 

 thecje 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. Somitet^ vii, viii, ix: two pairs (4) in 

 each, with pores in front of setie 4, and between 3 and 4. Each pair consists of two 

 separate spermathecje, one of which opens in the intersegmental groove in front of 

 seta 1, while the other opens similarly in front of a line drawn .'j the di>lanee ln-tween 

 settTi ;> and I, the ^ being toward- 1 and the 5 towards 3. r>i>tli pairs are, therefore, 



