NO. 2131. NEMATODE PARASITEl^ OF RODENTf^—HALL. 9 



to cover the topic to my satisfaction by practically transcribing his 

 descriptions and figures. These are adequate for all purposes of 

 identification, which is the standard proposed for this paper. Han- 

 som has adequately discussed the literature relating to this worm, 

 and I have adopted his views of the nomenclature as set forth in his 

 paper. 



STKONGYLOIDES species Parona. 



I have seen a reference to Strongyloklcs species from a rodent, 

 said to have been noted by Parona, but I have been unable to locate 

 tiny paper by Parona covering this observation. 



TRICHINELLOIDEA Hall, 1916, new superfamily. 



Superfamily diagnosis. — Nematoda (p. 4) : Esophagus consists of 

 a chitinous tube which is embedded along the greater part of its 

 length in a chain of single cells. The anterior portion of the body, 

 occupied by the esophagus, usually very slender; the posterior por- 

 tion, occupied by the intestine and reproductive organs, more or less 

 swollen, or at least thicker than the anterior portion. Anus terminal 

 or subterminal. Male wdth only one spicule or with no spicule. One 

 testis. Female with one ovary. Vulva situated at the junction of the 

 anterior and posterior portion of the bod3\ Oviparous or ovovi- 

 viparous. In digestive tract or adnexa or in urinary bladder as 

 adults. Life history usually simple. Larva of at least one intestinal 

 form penetrates to and encysts in the musculature of the host of the 

 adult worm. 



Type-fcwiily. — Trichinellidae Stiles and Crane, 1910. 



Family TRICHINELLIDxVE Stiles and Crane, 1910. 



Famjily diagnosis. — Trichinelloidea (p. 9) : Characters of the 

 superfamily. 



Type-genus. — TricJiinella Railliet, 1895. 



ANALYTICAL KEY TO SUBFAMILIES OF TRICHINELLIDAE, 



1. Male with 1 spicule or at least with a copulatory sheath Trichurinae, p. 19. 



Male witliont spicule or copulat(M\v slieath 2. 



2. Egg spherical, without true egg shell ; ovoviviparous ; males not parasitic in 



females; adult worms in digestive tract Trichinellinae, p. 10. 



Eggs variable in shape and with true, thiclc shell and opercular plugs ; ovip- 

 arous ; males parasitic in the uterus, of females ; Avorms in kidney pelvis, 

 ureters or in the urinary bladder Trichosomoidinae, p. 12. 



