CHEIEACANTHID^. 79 



Rudolplii ; Onchocerca, Diesing ; Trichina, Owen ; Eucamftus, 

 Dujardin ; ? Proleptus, Dujardin ; = Spiroptera, Dujardin ; = (in 

 part) Physaloptera, Rudolphi ; = Acuaria, Bremser ; = Fissula, 

 Bosc ; Simondsia, Oobbold ; Spirura, Blanchard and Leidy ; 

 Bispharagus, Dujardin; := (in part) Histiocephalus, Diesing ; 

 Tropidocerca, Diesing; = Tropisurus, Diesing; = Tetrameres, 

 Creplin ; Spiropterina, Van Beneden ; Gheilospirura, Diesing ; 

 Physocephalus, Diesing. 



Simondsia. — In this place I think it right to say a few words 

 in regard to a remarkable Nematode which exists in the collection 

 of Professor James Beart Simonds, of the Eoyal Veterinary College. 

 The worm in question has been regarded by Mr. Simonds as a 

 species of Strongyliis, but I am inchned to think that its affinities 

 will place it nearer to the genus Spiroptera. At present I have 

 only examined the female, which is characterised by the possession 

 of a multitude of large tentacle-like appendages surrounding the 

 neck. These processes, by their aspect, remind one of the so- 

 called branchial projections on the back of Eolis, but in this worm 

 I believe them to be special folds formed for the lodgement of 

 unusually developed uterine organs. The female is about three- 

 quarters of an inch in length; numerous specimens being dis- 

 covered by Mr. Simonds lodged within cysts occupying the walls of 

 the stomach of a German hog which died at the Zoological 

 Society's Menagerie, Eegent's Park. "With the discoverer's per- 

 mission, I have named the species Simondsia paradoxa. 



Cheiracanthidce. — I may here bring together, as a family, 

 several curious nematode genera, having the body usually more or 

 less armed by spiny developments on the integument, and having 

 the head distinct from the body. Some of them support only a 

 single spiculum, others have two spicules of nearly equal length. 

 I also include in this family, as aberrant types, the genera Eetero- 

 cheilus, Ancyr acanthus, and Aspidocephalus, which form a sort of 

 connecting link between the Cheiracanths and the true Ascarides 

 on the one hand, and between this family and the Filaridm on the 



