RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 1 79 



In several instances I observed a few free eggs and young worms 

 of 0.1 2 mm. in length within tubes in company with the parent, but 

 did not have the opportunity of investigating them. 



Manayunkia mainly differs from Fahricia in having a pair of 

 simple or undivided tentacular lophophores instead of having them 

 trilobate ; in the possession of an inner pair of larger tentacles, 

 which receive a continuation of the main trunks of the vascular 

 system, and in having no eyes to the terminal segment of the body. 



Explanation of the Figures of Plate IX. 



Fig. I. Manayunkia spcciosa. Magnified about 50 diameters. 

 The worm in the ordinary condition of extension, with its tentacles 

 spread. 



Fig. 2. x\ stock of five tubes. Magnified about 4 diameters. 



Fig. 3. One of the longer podal setae from the second setigerous 

 segment of the body. 666 diameters. 



Fig. 4. One of the shorter podal setae from the same. 666 diam- 

 eters. 



Fig. 5. A podal hook from the same. 666 diameters. 



Fig. 6. A row of podal hooks, from the last .segment of the body. 

 250 diameters. 



Fig. 7. Apodal hook from the same row. 666 diameters. 



Figs. 8-13. Egg and different degrees of development of the 

 young of Manayunkia. 100 diameters. 



Figs. 14-16. Podal setae of Fabricia Leidyii, Verrill. 500 diame- 

 ters. 



Figs. 17, 18. Podal hooks of anterior segments. 500 diameters. 



Fig. 19. Podal hook of posterior segments. 666 diameters. 



Figs. 20—24. Eyes of Fabricia. 250 diameters. 



Fig. 20. A cephalic eye of the usual form. 



Figs. 21-22. Right and left cephalic eyes of the same individual. 



Fig. 23. A double cephalic eye. 



Fig. 24. A caudal eye. 



[December, 1883. Nos. 514 and 518. See Bibliography.] 



A Fungus infesting Flics. — Prof. Eeidy directed attention to a 

 vial filled with flies adherent to fragments of leaves. He stated 

 that on the first of August, the last summer, he had noticed that 

 from the swarm of flies attracted by the ripe fruit of a black mul- 

 berry. Morns nigra, many settled on the under sides of the leaves, 

 and there became fixed and died from the invasion of a fungus, in 

 the same manner as the house-fly often becomes attached to walls 



