SOME LITTORAL OLIGOCH:HTA OF THE CLYDE. 65 
Fic. 14. Sketch illustrating the appearance of the spermathece of Hnchytreus dubius in the living 
animal, 
Fie. 15, Anterior part of the body of Hnchytreus sabulosus ; semi-diagrammatic, from the living animal. 
Amp., ampulla of spermatheca ; ¢.g., cerebral ganglion; d., duct of spermatheca; ws., esophagus ; 
pnph., peptonephridium ; ph., pharynx ; pr., prostomium ; s.g.'%, the septal glands of segments 
Iv.-Vl, 3 %.-vv., segments i.—Vvii. 
Fic. 16. Anterior part of the body of Hnchytreus albidus, semi-diagrammatic. 
Amp., ampulla of spermatheca; ¢.g., cerebral ganglion; comm., communicating cord from septal 
glands to pharynx, splitting up into numerous smaller strands at its junction with pharynx ; 
d., duct of spermatheca; @s., cesophagus; pnph., peptonephridium; ph., pharynx; pr., 
prostomium ; s., dark spot in cerebral ganglion; s.g/.'°, the three pairs of septal glands. 
Fie. 17, Ventral portion of a transverse section through the penial bulbs of Fridericia bulbosa. x 250. 
A/., alimentary canal, ventral to which are seen the ventral nerve-cord and ventral vessel; p., 
penial bulb of one side; sp., septum +3 bulged backwards to form a sperm-sac; ¢, male 
aperture, 
Fries. 4, 6, 7, 8, 10, 11, 12, 13, 17 drawn from sections by means of Zeiss’s Abbé’s drawing apparatus. 
