Df-ndroooelopsis alaskensis Kenk , 1955 



82 



83 "- 



vd vs 



I I 

 a ode gp bd 



Fig. 83 after Kenk (1953), 



A large, white species, not yet studied at full maturity. Largest speci- 

 men examined 20 mm long and 4 mm wide. Anterior end truncated, with 

 slightly convex central part of the frontal margin flanked by rounded 

 auricles protruding anteriorly and laterally. No distinct adhesive or- 

 gan. Eyes normally two, separated by about 1/3 the width of the head and 

 nearly equidistant from the frontal and lateral margins. There sometimes 

 are smaller accessory eyes developed in front of or behind the principal 

 eyes. The description of the reproductive system is based on the exami- 

 nation of one specimen which was not fully mature. Primordia of the 

 testes predominantly ventral, traceable posteriorly to the level of the 

 mouth (they possibly may extend farther back in fully mature animals). 

 Penis with spherical bulb and short papilla. Vasa deferentia open sepa- 

 rately into the penial lumen. Penis cavity in wide communication with 

 the undivided genital atrium. Common oviduct opens into atrium anterior 

 to the opening of the bursal duct. In springs and cold creeks in Alaska. 

 Literature: Kenk (1953). 



y 



60 



