THE FREE-LIVING FLATWORMS (TURBELLARIA) 355 



83 (102) Normal eyes two or none Planaria . . 84 



84 (loi) With two normal eyes (sometimes with one or more irregularly 

 placed accessory eyes) 85 



85 (94) Anterior end more or less pointed with angular cephalic append- 

 ages 86 



86 (91) Anterior end bluntly pointed, angle formed by lateral margins of 

 head not less than 60°. Cephalic appendages blunt. Body 

 about as wide just back of appendages as immediately in 

 front of them 87 



87 (88) Angle formed by lateral margins of head much greater than 60°. 

 Cephalic appendages very inconspicuous, almost entirely 

 wanting in young specimens. 



Planaria Joremanii (Girard) 1852. 



Length of mature specimens 7 to 15 mm., breadth 

 2 to 4 mm. Color nearly uniform seal-brown or dark 

 gray to slate-black, with an inconspicuous gray area 

 on each cephalic appendage. Eyes gray with a cres- 

 cent of black pigment on the median side. Body 

 comparatively thick. Ovaries two, ventral, somewhat 

 lobed and situated about halfway from anterior end 

 to pharynx. Testes four or live on each side, un- 

 paired, dorsal and irregularly distributed from region 

 of ovaries to posterior end of pharynx. Does not 

 multiply by fission. Found in small streams in 

 Mass., Penn., Md., Va., and near Washington, D. C. 



The species described by Curtis (1900) under the 

 name Planaria simplicissima and later by Stevens un- 

 der the same name clearly must be regarded as syn- 

 onymous with the species established by Girard in 

 1852 under the name P. foremannii. This species 

 also appears under the name P. lugubris in various 

 papers dealing with the physiology of planarians. 



Fig. 62Q. Planaria Joremanii. {A) Outline sketch of large mature specimen: g^, genital pore; ph, 

 pharynx: s, sensory area on cephalic appendages. X 4. (After Stevens.) (B) Sexual organs, longitu- 

 dinal section, dorsal view; c, cirrus; J, oviduct; ^A, pharynx; 5if, seminal vesicles; /, testes; »/, uterus; 

 V, ovary; vi, yolk glands; vl, vas deferens. X 20. (After Curtis.) 



88 (87) Angle formed by lateral margins of head about 60°. Cephalic ap- 

 pendages distinct. Anterior margin of cephalic appendages 

 of about same length as posterior margin 89 



