49 

 Lumbriculus Grube. 



Prostomium rounded. Setae cleft, One pair of spermidu- 

 cal pores. Two pairs of oviducal pores. Three pairs, or more, 

 of spermathecal pores, open laterally on some of somites IX 

 XVI. Dorsal and ventral vessels connected in posterior pad 

 of each somite by a pair of transverse vessels; the dorsal vessel 

 in each somite with one pair of contractile caecal transverse ap- 

 pendages except in a few anterior somites. Sperm-ducts open 

 into a single atrium or pair of atria provided with protrusible 

 penis. Two pairs of ovaries and of oviducal funnels. Sperma- 

 thecae simple; three pairs or more in somites posterior to atria. 



Lumbriculus variegatus (0. F. Muller). 



In life reddish to dark brown, anteriorly greenish. Pros- 

 tomium rounded conical, length U times the basal width, with 

 "head" pore at the apex. Spermiducal pores on VIII (excep- 

 tionally on VII), posterior to ventral setae. Two pairs of 

 oviducal pores, IX/X and X/XI. Spermathecal pores on some 

 of somites IX — XV, sometimes asymmetrically distributed. 

 Brain anteriorly slightly concave, posteriorly with a deep, 

 rounded trilateral incision. Transverse vessels of I- VIII much 

 branched, forming a connected vascular plexus, the following 

 ones simple; contractile caecal transverse appendages of the 

 dorsal vessel beginning in IX. at first short and simple bul 

 becoming longer and branched in succeeding somites. One 

 pair of testes and one pair of spermiducal funnels in VIII. 

 Atria pyriform, one pair in VIII (exceptionally in VII), or 

 single. Two pairs of ovaries and of oviducal funnels in IX 

 and X. Spermathecae simple, three pairs or more in some of 

 somites IX — XV, sometimes asymmetrically distributed. 

 An unpaired copulatory (albumen) gland in IX. ' Length, 

 40 — 80 mm. Diameter, 1 — 1.5 mm. Number of somites, 140 

 200, or more. 



