ON CALIFORNIA EUDraLID.E. 



RY GUSTAV EISEN. 



The California Oligoclia'ts, to be described below, are all related to the well- 

 known genera Microseolex, Pontodrilus, Plutellus, etc., referred by Benliam, Rosa 

 and otbei'8 to the general family of Eudrili(be, and by Bcddard to his family Crypto- 

 drilid;e. I will not here discnss the relative merits of the respective families, as the 

 number of species belonging to them is hardly sufficient to enable us to as yet come to 

 any definite conclusion. For the jnx'sent, at least, I retain these genera in the family 

 of Eudrilid;e. But I must concede that this family, as defined by the above investi- 

 gators, contains two distinct main types — one represented by Eudrilus and the other 

 by Microseolex — and a separation in families should be made in reference to them, 

 though I am <iot prepared to make the separation as wide as Beddard has done. Our 

 California species ally themselves to the Microseolex group, and especially to JNIicro- 

 scolex and Plutellus. A species of Pontodrihis was found too late to be included. I 

 believe this family may be conveniently divided into several subfamilies based upon 

 the openings of the spermducts, prostates, penial sacs, as well as upon the location of 

 the nephridio-pores. Our C-alifornia forms may thus be grouped as follows: 



PONTODRILIXI. 



The eight setic are separate though in four couples on every somite. 

 CliteUum complete. 

 Male i)ore in somite xviii. 



Nephridia — mega-nephriilia only — commence posteriorly to somite xiii; the pores are in line with set.i; 2', 

 not alternating in position. 



The prostate receives the spermduct previous to its entering the maleijore. 



No gizzanl, no typhlosole, no sulnieural vessel. Poxtodrilu.s E. P., 18S1. 



PitoTODRiLu.s Girard, 1887. 



iMICROSf'OLKt'INI. 



Eight seta3, separate iu four couples ; the setro of the inner couples not always parallel. 

 Clitclhim complete. 

 \r.,i„ „..,.„ ;.. ;»„ ..«:: 



its entering the male pore; or opens separately iu the same 



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; the nephridia iu line with one of the seta) .3 or 4. The first 

 iv from the posterior ones. 



BuoiiODRiLrs Beddard, 1889. 



MicRosfOLEX Kosa, 1887. 



Deltania Eisen, 189.3. 



opens separately, hut iu the same pore, 

 on iu position either in front of or outside of the setaj. 



Plutellus Pei-rier, 1873. 



.\Ri:n.oi'iiiLUS Eisen, 1893. 



