CALIFORNIA EUDRILIDA. Hy} 
Vascular system (fig. 86 Band 119). The following remarks on the yascular 
system can only be considered as preliminary, a more detailed report being reserved 
for a future study of living specimens. The main system consists of two longitudinal 
vessels, one dorsal and one ventral. There is no subneural vessel. Three pair of 
stout, oblong, thrice-contracted and sac-like hearts connect the ventral and dorsal] ves- 
sels in x, xi and xii. The typhlosole has already been described. 
The secondary vessels are characterized by numerous bead-like constrictions 
and swellings of the smaller branches, especially of those surrounding the funnels of 
the nephridia, and of the secondary vessels of the ventral longitudinal vessel. 
Of the genus Argilophilus there are two rather distinet forms in California, which 
however, only differ externally, and, strange enough, have not, as a rule, been found in 
the same locality. Through careful dissection and sectioning I have not been able to 
distinguish any anatomical differences between the two species, though I have never 
seen any transitory forms as regards to the external markings. According to our 
present knowledge of earthworms we always expect to find internal specific charae- 
teristics of the species, and if such are not found we must hesitate to consider the re- 
spective forms as different species. Under such circumstances I will here refer to 
the two forms of Argilophilus only as varieties or subspecies, leaving to further inyes- 
tigations, if possible, to detect any internal differences. 
Argilophilus marmoratus ornatus. 
Figs. 125 to 129. 
Argilophilus marmoratus ornatus Eisen, Zoe, iv, 253, October, 1893. 
There are two rows of ventral papillee between some of the somites in the vi- 
cinity of the clitellum, interior or posterior to it, or both. These papillse are always 
more or less in line with sete i, of rounded or slightly oblong form, and generally 
more or less of the same size. The number of papillse varies, and frequently one 
papilla in a pair is wanting. 
Habitat. I have found this worm only in the vicinity of Santa Rosa, Sebasto- 
pol, ete., north of San Francisco Bay. It occurs there in rich heavy soils, and con- 
stitutes the most common earthworm of the district. In the vicinity of Sebastopol | 
found this subspecies both in manure piles and in the wet, soggy places near the la- 
goon, places which part of the year must be covered with water from the slough or 
lake. Among several hundred worms collected in the month of May during one day, 
I found only one single specimen with median papille; all the others possessed lateral 
papille (fig. 125 to 128). 
The body is thick, cylindrical, and only slightly tapering toward either end 
(fig. 132). As usual, the anterior segments are much wider than the post-clitellar 
ones. The prostomium frequently protrudes like an inyerted sac hanging over the 
peristomium (fig. 130), as is probably the case with most genera of this family. 
While the anterior somites are well set off, the clitellar somites are less distinet, 
