310 



CKKSSWKLL SlIKAliKi;. 



Ill the male special muscles aie developed iu relation with 

 the claspers and the penis. These are similar in their arrange- 

 ment to tlie same muscles of Stratiod rilus. The penis 

 possesses a pair of protractors and retrHctors. The retractor 

 muscles also function as the retractors of the claspers. They 



Text-figs. 1 and 2. 



I. Ma-le. *'• "^ Femaule. 



The muscles seen from the dorsal side in the male and female. 

 The division of the longitudinal bands in the head and 

 caudal regions is also represented. 



run from the base of the penis to the base of the claspers, 

 and by their contraction at the same time retract the penis 

 and claspers. The claspers have also, as in Stratiodri lus, 

 a set of protractor muscles, which run obliquely forwards and 

 inwards in the generative segment, and also a few fibres that 

 run from the bottom of the clasper sheath to the anterior lip 

 of the same. 



