CALIKOKXIA EUDIUI.ID.K. 53 



Vascii/'ir xii^itciii (fii--. SfJ />' iiml J HM. Tlu' lolldwiiiji' remarks (in the vasculiir 

 sj'stem can only be considered as prcliiniiiarv, a more detailed report being reserved 

 for a future study of living spccimciis. TIic main system CDUsists of two longitudinal 

 vessels, one dorsal and one ventral. There is no subneural vessel. Three i>air of 

 stout, oblong, thrico-contracted and sac-like hearts connect the ventral and dorsal ves- 

 sels in X, xi and xii. The typlilosolc has already been described. 



The secomlary vessels are characterized by numerous bead-like constrictions 

 luul 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 Argilopliil us there are two rather distinct 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 

 l)resent knowledge of earthworms we always expect to find internal specific charac- 

 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 inves- 

 tigations, if possible, to detect any internal differences. 



Argilophilus marmoratus ornatus, 



Figs. 125 to 129. 

 Argilophilus jiKtrmoratns ornatus Eisen, Zoe, iv, 253, October, 1893. 



There are two rows of ventral papilhie between some of the somites in the vi- 

 cinity of the clitellnra, interior or posterior to it, or both. These papilhe are always 

 more or less in line with setie i, of rounded or slightly oblong form, and generally 

 more or less of the same size. The number of papillte varies, and frequently one 

 papilla in a pair is wanting. 



Hnhitnt. I have found this worm only in the vicinity of Santa Rosa, Sebasto- 

 pol, etc., 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 I 

 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 papillie; all the other's possessed lateral 

 papilla? (fig. 125 to 128). 



The hodij 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 pi-otrudes like an inverted 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 distinct, 



