24 (23) Eyes separated by about 1/3 the width of the head, about 



equidistant from frontal and lateral margins: 



Dendroooelopsis alaskensis Cp- 60) 

 Eyes close together, removed farther from frontal than from 



lateral margins 25 



25 (24) Anterior intestinal ramus extending to a level in front of the 



eyes Planaria oaaulta (p . 30) 



Anterior intestinal ramus starts behind level of eyes 26 



26 (25) Opening of ejaculatory duct at tip of penis papilla: 



Fhagooata oregonensis (p. 32) 

 Opening of ejaculatory duct on ventral side of penis 



papilla 27 



27 (26) Tip of penis papilla with a muscular, wart-like structure, 



testes extend to level of mouth: 



Phagoaata movgani morgani (p. 40) 

 Tip of penis papilla without muscular wart, testes extend to 

 posterior end Phagoaata nivea (p. 42) 



28 (7) Inner pharyngeal muscle zone with separate layers of cir- 



cular and longitudinal fibers 29 



Inner pharyngeal muscle zone with one layer of intermingled 

 circular and longitudinal fibers 30 



29 (28) Body turtle-shaped, with cylindrical snout, postpharyngeal 



region reduced Kenkia rhynohida (p. 56) 



Body elongated, flat, in life without snoutlike extension, 

 postpharyngeal region well-developed: genus Sphalloplana 

 (The systematics of this genus is undergoing great changes 

 as more material is made available to specialists by the 

 efforts of speleological investigators. For in part un- 

 reliable data on individual species see the descriptive 

 part of the report, pages 45-55.) 



30 (28) Adhesive organ forms a deep subterminal invagination on the 



head, copulatory complex excessively glandular: 



Maovocotyla glandulosa (p. 57) 

 Adhesive organ in form of a disc or shallow depression 31 



31 (30) Body pigmented 32 



Body unpigmented, white 34 



32 (31) Penis with voluminous bulb, no papilla: 



Reatoaephala exotica (p. 65) 

 Penis with normal bulb and papilla 33 



33 (32) Testes ventral, to level of gonopore: 



Dendroooelopsis vaginata (p. 58) 

 Testes dorsal, to posterior end: 



Dendroooelopsis piriformis (p. 59) 

 17 



