952 



WOEMS 



an inch in length, has first a curious pair of ' frontal horns ' pro- 

 jecting laterally from the head, so as to give the animal the appear- 



FIG. 718. Structure and development of Tomopteris onisciformis : A, portion 

 of caudal prolongations, containing the spermatic sacs, a a ; B, adult male 

 specimen ; C, hinder part of adult female specimen, more enlarged, showing 

 ova, lying freely in the perivisceral cavity and its caudal prolongation ; D, 

 ciliated canal, commencing externally in the larger and smaller rosette-like 

 discs, a, & ; E, one of the pinnulated segments, showing the position of the 

 ciliated canal, c, and its rosette-like discs, a, b ; showing also the incipient 

 development of the ova, d, at the extremity of the segment ; F, cephalic gan- 

 glion, with its pair of auditory (?) vesicles, a a, and its two ocelli, b b ; G-, very 

 young Tomopteris, showing at a a the larval antennae ; b b, the incipient 

 long antennas of the adult ; c, d, e, /, four pairs of succeeding pinnulated 

 segments, followed by bifid tail. 



