DESCRIPTIONS OF GENERA AND SPECIES 343 



bodies in the skin ; the same author has mentioned a similar presence of chlorophyll 

 in Enchytraeus affinis l . The brain is described by UDE as longer than broad, with 

 a slight convex hinder margin; the dorsal vessel arises behind the clitellum in the 

 sixteenth segment. The funnels of the sperm-ducts are 2-3 times as long as broad ; 

 the prostates are large. The salivary glands are branched at the extremity. 



(2) Fridericia bulbosa (ROSA). 



Neoenchytraeus bulbosus, ROSA, Boll. Mus. Zool. Torino, 1887, No. 29. 

 P. bulbosa, MICHAELSEN, Abh. Nat. Ver. Hamb. 1889, p. 42. 



Definition. Length, 8mm.; number of segments, 42; setae, 4 per bundle in anterior segments, 2 

 posteriorly. Lumen of anteseptal part of nephridia short, wide, and straight. Spermathecae 

 without diverticulum, duct about twice the length of pouch, with glands at base. Hab. 

 Italy ; Germany. 



This species has been described by both ROSA and UDE (1) ; their accounts 

 differ in some small particulars, which possibly are indicative of geographical 

 varieties. Thus ROSA speaks of the salivary glands as slightly branched, generally 

 only bifurcate, while UDE says that they are simple and not branched. ROSA 

 found no glands upon the spermathecal duct, which are stated by UDE to be 

 present. The brain is said by ROSA to be rounded behind, by UDE to be slightly 

 concave ; this difference is in all probability to be set down to the different degrees 

 of contraction of the cerebral muscles. The funnels of the sperm-ducts are three 

 times as long as broad, their ducts are furnished with large spermiducal glands (UDE). 



(3) Fridericia callosa (EISEN). 



Neoenchytraeus callosus, EISEN, Ofv. Svensk. Akad., 1878, No. 3, p. 76. 

 Enchytraeus callosus, VEJDOVSKY, Syst. u. Morph., 1884, p. 41. 

 P. callosa, MICHAELSEN, Abh. Nat. Ver. Hamb., 1889, p. 42. 



Definition. Length, 20 mm. ; number of segments 64 (about) ; setae, 4 in a bundle. 

 Anteseptal part of nephridium short, with straight duct ; duct leading to exterior comes 

 off just behind septum. Spermathecae with three indistinct diverticula. Hab. Nova 

 Zembla. 



Our knowledge of this species, originally due to EISEN, has been supplemented 

 by MICHAELSEN. The anterior as well as the posterior margin of the brain is 

 convex ; the length of the brain is about a quarter greater than its breadth. The 



1 See description of Anacliaeta, where chlorophyll does occur. 



