WOODWOETH: ILLINOIS TUEBELLARIA. 7 



11,664Z>, Station C ; 13,069, Station C. 



Only one of the specimens exhibited sexual organs. There is no copulatory 

 bursa and the oviducts open separately into the vagina immediately before it 

 enters the genital atrium. The species in every way agrees with descriptions 

 of the European form. There can be no doubt that it is the species described 

 by Girard as Dugesia gonocephaloides. According to this author the latter differs 

 from P. gonocephala only in the elongated form of the clear areas surrounding 

 the eye-spots, and upon this meagre difference is founded the genus which 

 Girard afterwards (1891) extended to include aU forms bearing angular cephalic 

 appendages. Stimpson and Diesing retained the specific name, but placed it 

 under the genus Planaria, a fact that was apparently unknown to Silliman, who 

 renamed it Planaria gonocephaloides, Hallez (1890, p. 78) has discussed the 

 value of Girard's genus Dugesia, and places D. gonoce2:)hala as a synonym of 

 P. gonocephala, in which species the elongated shape of the periocular areas is 

 not uncommon. P. gonocephala has been shown by lijima (1890, p. 338) to be 

 cosmopolitan in its distribution, as it was found by him in Japan. 



The color of the American representatives of P. gonocephala differs from that 

 of the European in being of a deeper hue. The European forms vary from a 

 gray to a brownish green, while the Illinois specimens are of a deep brown, 

 which is well reproduced in Figure 5. Some specimens from France that I 

 have received through the kindness of Professor Hallez, of Lille, are almost 

 white in the alcoholic condition. Girard (1893, p. 183) describes the color of 

 Dugesia gonocephaloides as often being a blackish brown. 



Planaria dorotocephala, sp. nov. 



Figures 4, 7. 



Planaria maculata var. a Girard, 1893, p. 182. 



Sides parallel, tapering gradually to a point posteriorly. Anterior end large, 

 sharply pointed, the sides of the head making an angle of about 45° with each 

 other. Two long sharjjly pointed, very prominent auricular appendages, 

 slightly posterior to the plane occupied by the eyes. Auricles always prom- 

 inent in preserved material. Length of head about ^ of the total length of the 

 animal. Width of the head at its junction with the auricular appendages 

 greater than the diameter of body anj-where posterior to the appendages. Color, 

 reddish to yellowish brown, uniform. Posterior margins of auricular append- 

 ages free from pigment. Occasionally a narrow light median streak extending 

 caudad from just back of the eye-spots. Length 8 to 13 nun., greatest breadth 

 ^ to 1^ mm. 



22,081; Station H, IMatanzas Lake; Station C; Havana. 



A very active, restless, rampant form. When in motion the head is elevated 

 and moved from side to side, the long auricular appendages being elevated above 

 the head. After being disturbed, it does not come to rest for a long time as 

 compared with P. gonocephala and P. macidata, the latter being particularly 

 sluggish. A peculiarity of this species is the frequent occurrence of accessory 



