1883.] NATURAL SCIENCES OP PHILADELPHIA. 211 



The segments succeeding the head are furnished with lateral 

 fascicles of podal setae, and, except the first oi^, are provided 

 with fascicles of podal hooks, all of which have the sarae general 

 arrangement and form as those described in llanayunkia. The 

 fascicles of podal seta?, from the first to the eighth segments, usu- 

 ally contain six or seven setie ; those of the ninth and tenth 

 segments, three or four setae ; and those of the eleventh segment 

 two or three setae. The longer setse, figs. 14, 15, resemble those 

 of Manayunkia, consisting 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 setse 

 range from 0'12 to 0-25 mm. long. 



The first setigerous segment possesses no podal hooks, as in the 

 case of Manaxjunkia. 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 

 remaining three segments, as in Manayunkia^ are very different 

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

 transverse 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 Manayunkia, but differing in 

 the hook being furcate, or even divided three or four times on 

 the dorsum, as represented in figs. IT, 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 Manaywikia. The mouth has a pair of palp- 

 like appendages, situated between the lophophores. The vascular 

 system appears to exhibit the same arrangement as in 3Ianayunkia, 

 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 ihe head. The 

 eyes are of simple character, but equally well developed at both 

 extremities 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 diffei'ent sides of the same individual. Fig. 20 repre- 



