178 RESEARCHES IN HELMINTHOI.OGY AND PARASITOLOGY. 



four setae, and those of the eleventh segment two or three setae. The 

 longer setae, Figs. 14 and 15, resemble tho.se of Manayiinkia, consist- 

 ing of a straight rod, with a feather-like vane ending in a long point 

 and bent at an obtuse angle from the rod. The stouter setae, Fig. 

 16, have the same form, but differ in the variably much shorter 

 proportion of the vane. The setae range from 0.12 to 0.25 mm. 

 long. 



The first setigerous segment posses.ses no podal hooks, as in the 

 case of Manayunkia. The fascicles in the succeeding segments to 

 the fourth contain each eight or nine hooks, and those following to 

 the eighth, inclusive, six or seven hooks. The hooks of the re- 

 maining three segments, as in Manayiinkia , are verj' diiferent from 

 those of the anterior segments, and are arranged in close tranverse 

 semicircular rows of from 20 to 28 in each row. 



The anterior podal hooks consist of a curved handle ending in a 

 short robust hook, like those of Maiiayujikia, but differing in the 

 hooks, being furcate, or ev^en divdded three or four times on the 

 dorsum, as represented in Figs. 1 7 and 18. These podal hooks usually 

 measure about 0.08 mm. long. 



The posterior podal hooks resemble the corresponding ones of 

 Manayunkia , as represented in Fig. 19. They measure from 0.035 

 to 0.04 mm. long. 



The intestinal canal of Fabricia has the same simple character as 

 that described in Manayunkia. The mouth has a pair of palp-like 

 appendages, situated between the lophophores. The vascular sys- 

 tem appears to exhibit the same arrangement as in Manayunkia, but 

 the blood is of a red color. 



Fabricia is remarkable for being furnished with a pair of eyes to 

 the terminal segment of the body as well as to the head. The eyes 

 are of simple character, but equally well developed at both extrem- 

 ities of the body. They consist of a black pigment cup, including 

 a spheroidal vitreous body. In several instances I observed a curious 

 variation of the eyes in different individuals and on the different 

 sides of the same individuals. Fig. 20 represents the usual form of 

 the cephalic eye. Figs. 21 and 22 represent the two eyes of the 

 same individual, the right eye apparently double. Fig. 23 repre- 

 sents another double eye, but with the lens directed backward. 

 Fig. 24 represents a caudal eye. 



The tube of Fabricia is composed of exceedingly fine particles of 

 quartzose sand and indefinite particles of mud. 



I observ^ed no specimens of this genus exhibiting the reproductive 

 organs in the condition usual in mature ones of Manayunkia. 



