392 THE ZOOLOGIST. 



Fridericia and Henlea. My notes agree in most points with the 

 original, and I transcribe tLem for the light they throw on varia- 

 tion: 



Length about 15 mm. when living, but if at rest it may 

 measure no more than 12 mm. ; segments 50-60. Transparent 

 and easy to study. Setae 6 to 8 or 9 in front, 5 and 4 behind, 

 rarely 3. Brain large, convex behind as usual. Salivaries 

 slightly branched. Spermathecse with short, stout duct, sessile, 

 indefinite glands to the ampulla and two glands at the outer 

 opening. Sperm-funnel not large, say 2-3 times longer than 

 broad, with moderately large long duet and rather large male 

 pore. Large dorsal pores. The dorsal vessel arises about the 

 18th segment, and the Worm emitted quite an appreciable 

 quantity of white mucus when placed in alcohol. 



Habitats : Grounds of the Schloss, Neuwied, and woods around 

 Braunsberg. 



5. Fridericia callosa, Eisen. 1 



First described by Eisen (7) in 1878 as occurring in. Siberia, 

 this Worm has been often found since in various parts of Europe. 

 Like most species of Fridericia it is liable to consideralble varia- 

 tion. The following are the chief characteristics of the Khinegau 

 form. ^ 



Length about 10 mm. ; segments 50. Adult trai^qsparent. 

 Setse 4-6 in front, unequal, decreasing posteriorly to 3 ai^id 2 per 

 set. Dorsal vessel strong, arising about the 20th sd-gment. 

 Three pairs of septals, oval in shape and nearly equal i-;n size. 

 Sperm-funnel small, not greatly exceeding the penial bulb. , Du( fc 

 in the girdle segment long, stout, and much convoluted. Tu.6 

 spermathecse exactly agreed with the type, except that the outer 

 opening is glandular. 



One of my specimens was full of encysted Gregarines. F^ound 

 between Oberbieber and Braunsberg. I have only met wit^a it a 

 few times in England, and in each instance the variations , have 

 been considerable. 



6. Fridericia par oniana,Isse\? I 



An immature specimen of a bisetose species was found a-jmong / 

 decaying leaves by a streamlet in the woods already mentioned, 



