Sphalloplana peraoeaa (Packard, 1879) 



Synonyms: Dendroaoelum percoeaion Packard, 1879; Fontioola peraoeoum: Hyman, 

 1931. 



en (^ , t;*^ bp bd ode 



Fig. 52 after Carpenter (1970), modified, 

 Fig. 53 after Hyman (1937b), modified. 



Length up to 16 mm, width about 3 mm. Head truncate, with convex frontal 

 margin and a pair of prominent, rounded auricles projecting antero- 

 laterally. A weak adhesive organ is present in the center of the anterior 

 margin, consisting of a subterminal depression covered with an eosino- 

 philic glandular epithelium to which retractor muscle fibers attach. 

 Eyeless and without pigment, white. Lateral margins of the body with a 

 zone of tall epithelial cells containing long rhabdites. Testes dorsal, 

 prepharyngeal . The penis has a rounded bulb and a conical papilla. The 

 vasa deferentia enter the bulb anterolaterally and open separately into 

 the elongated penial lumen which is not distinctly divided into a seminal 

 vesicle and an ejaculatory duct and opens at the tip of the papilla. The 

 common oviduct enters the genital atrium from the dorsal side at the 

 transition between the male atrium and the small common atriiom. The 

 copulatory bursa is sac-shaped, its stalk rather narrow in the anterior 

 portion which passes above the penis and widens only near its opening 

 into the common atrium behind the mouth of the common oviduct . Caves in 

 Kentucky and probably in neighboring states. Principal literature: 

 De Beauchamp (1931), Buchanan (1936), Hyman (1937b). 



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