168 G. A. and W. G. MacCallum, The family Koellekeriadae. 



Koellikeria scomberomori. 



Fig. 6. Sketch of whole worm showing mouth sucker and pharynx 

 and arrangement of organs in body, 



Plate 2. 



Koellikeria haemuli. 



Fig. 7. Section taken through the whole encysted mass showing 

 uterine and ovarian coils as well as some testicular folds. Cyst wall sends 

 septa between the coils of the worm. 



Fig. 8. Head showing mouth sucker, pharynx, supraoesophageal 

 ganglia, uterus vas deferens and intestine. 



Fig. 9. Section through several lobes showing the shell gland 

 with the projecting junction of oviduct, vitellarium and uterus. 



Fig. 10. A coil of the relatively male w(jrm showing testis, vas de- 

 ferens and seminal vesicles. 



Nematobothriimi sardae. 

 Fig. 11. Whole worm. 



Plate 3. 



Head and neck showing mantle of cells about intestine. 

 Longitudinal section of mouth sucker, pharynx and oeso- 



Longitudinal sections of the heads of the worms forming 

 a pair, showing the inequality of development of the sexual apparatus. 



Fig. 15. Longitudinal section through cyst wall, three coils of the 

 worm and the vascular film. 



Fig. 16. Portion of the whole worm showing junction of ovary, 

 vitellarium, receptaculum seminis and beginning of the uterus in the midst 

 of the shell gland. 



Note. Since returning the proof of this paper for publication we 

 have been dismayed to learn that we had overlooked an important paper 

 on the same subject (Zur Anatomie der Didymozoen by T. Odhnee 

 which appeared in a volume dedicated to Prof. TuLLBERG, Zoologiska 

 Studier, TJppsala, 1907). 



Odhnee describes Did'ipnozoon sconibri and Wedlia hipartita and pro- 

 poses to separate as Didynioxoon those forms with separate sexes while 

 for the hermaphrodite D. bipartilian he retains the old name ]Vedlia given 

 by CoBBOLD. Although dealing with species different from those which 

 form the subject of this paper he has described in detail most of the 

 internal organs which we thought we were studying for the first time. 



