852 DR. WILLIAM NICOLL ON 



unequal contraction of the phaiyngeal walls or perhaps clue to the 

 drawing of the cesophagus into the lumen of the pharynx, but 

 neither of these possibilities seemed to accord with experience. 

 The condition appears to be brought about by the thinning of the 



Text-fig. 122. 



0. J. 



R.5. ~T ' • 



Ov 



A B 



M. Rhodes del. 



A. Sti/p7ilodora najce, si:>. n. Ventral view, x 40. C, cirrus; 

 Ov., ovary; B.S., recejDtaculum seminis. 



B. Xeno]pliari/nx solus, gen. et sp. n. Ventral view, x 25. 

 Ov., ovarj'. 



posterior part of the phalangeal wall, which anteriorly is of the 

 usual thickness. In section the appearance is somewhat horse- 

 shoe-shaped. It is unfortunate that no second specimen was 



