ON THE ANATOMY OF HISTRIOBDELLA HOMARI. 



313 



.the centre of each leg to the commenceraeut of the outer 

 third, where it gives off a mass of tine, darkly staining 

 tubules, which open on the pyramidal pad of the foot. This 

 gland is able to pour out a copious viscid secretion. Fre- 

 quently, when the animals are irritated, this secretion can be 



Text-fig. 3. 



tr.m. 



Head showing the muscles in connection with the feet and 

 the jaws. bl. vi., Bnlb-like mnscnlar organ of the jaws ; 

 cl.p., ciliated pit of the head; cr.f., crossed strands of the 

 dorsal longitudinal muscles ; on. d.f. a., dorsal longitudinal 

 muscles I'unning into anterior surface of the foot; tn.d.f.p., 

 doi'sal longitudinal muscles running into posterior surface 

 of the foot; m. <//., salivary gland of the mouth; m.d.j., 

 dorsal longitudinal muscle running to jaw apparatus ; 

 tr. VI., transverse muscle-strands running into the feet. 



seen pouring out from the ends of the tubules, forming 

 minute round drops on the end of the foot. Like the anterior 

 limb, the posterior has some muscular fibres apart from those 

 it receives from the longitudinal muscle-bands. These are a 

 delicate set of fibres just under the cuticle on the posterior 

 surface, that run from the extremity to be inserted on either 

 side of the anus. In addition to these there are some oblique 



