DR. T. S. COBBOLD OX SDIOXPSIA PAEAPOXA. 



no departure from the ordinary nematode type of structure prepares us. in some degree, 

 for a similar outcome in respect of the hitherto undiscovered male SpJuerularia. Be 

 that as it may, the mere fact that Sir John Luhbock did not notice any spicule in the 

 jody of the alleged male Spharularia is pretty strong proof that the minute creature 

 .yas not of that sex. Professor Schneider at once saw the significance of this negative 

 character *. 



The chief point of interest in Simoadsia lies in a correct interpretation of the morpho- 

 ogy of the organ which I call the " rosette." I do not pretend to have settled the 

 question of its homology ; but, guided by the facts observed, I think that the rosette is 

 a prolapsed uterus. It is thus the equivalent of the so-called " generative animal" of 

 Spharularia, whilst the body proper represents the " nutritive animal," as interpreted 

 jy Schneider. It is furnished internally with two egg-containing horns. The rosette 

 -hows evidence of spiral twisting ; and this may sufficiently account not only for its 

 flattened spherical figure, but also for its unlikeness, in this respect, to the equi- 

 valent organ in Splucrularic. I presume that the branched external pr( 5S - are homo- 

 logous with the spherules of Sphantlaria, whilst the ultimate caecal capsules have, as 

 far as I know, nothing comparable to them in nature. Their outer surfaces are finely 

 tuberculated. Internally, the cseca and branches of the uterine wall are lined with 

 granular debris, which I believe to be the remains of cells, comparable to the polygonal 

 cells figured both by Schneider and Sir John Lubbock in Splnerularia, such cells being 

 held by the former observer to be characteristic of uterine structure in this class of 

 animals. 



No diagnosis, either of the genus or species, having been given. I submit the 

 following : — 



SnioNDsiA. Cobb. 



A genus of endoparasitic nematodes, iu which the female is furnished with au external and much 

 enlarged uterus, whose walls expand into branches terminating in cava. Females encysted. Males 

 free. 



SlAIOXPSIA PABADOXA, Cobb. 



Head bluntly pointed; neck with narrow lateral wings ; mouth simple, with two pro- 

 minent side papillae; body of uniform thickness generally, but externally supporting, in 

 the female, a large rosette-shaped organ formed by the uterus ; tail of the male spirally 

 twisted, suddenly narrowed to a blunt point ; spicules two. long and slender ; tail of the 

 female twice as thick as the body, conical, bluntly pointed, with three broad-based spines 

 immediately above the anus. 



Length of the male half an inch. Length of female six tenths ot an inch. 



Sab. Stomach of the domestic hog (Su$ scroti', var. domestica) ; males free ; females 

 encysted within the walls, their heads projecting into the cavity of the organ through a 

 narrow passage of intercommunication. 



* Since this paper was read. Trot. Lnton S hneider has announced the actual discovery of the male SpJuerularia 

 and has cleared up the mystery attaching to its development. See ' Zoologische Beitrage,' Bd. i. S. 1. Taf. 1. 

 Breslau. 1- . 



