NEMATODES FROM PECCARIES SCHWARTZ AND ALICATA 



3 



Tho tips of the extoi-iio-lateral, medio-lateral, and j^ostoro-latoi-al 

 rays are in relation with the posterior border of the bursa. The 

 externo-doi-sals are given off from the dorsal ray; the latter divides 

 distally into two branches, each of which is forked terminally; the 

 (loisal lay uivos off" a slender horizontal branch on each side at about 

 the lc\('l where it foi-ks. An accessory bursal membrane, sup])orted 

 by two slender divergijig rays, is ])i'esent. Spicules with innei' 

 |)i()cesses, the terminal portion of each s])icule being acutely pointed. 

 Ciubernaculum is long and slender; prebursal papillae present. \'ulva 

 naked, located about one-fifth of the length of the body from the 

 posterior end. Ovejectors well developed. Eggs oval, thin-shelled. 

 While Parostertagia is closely related to Ostertagia, it differs fi'om 

 the latter in two I'cspects: (1) The i-elation of the ventro-ventral 

 and latero-ventral ravs to each other and (2) the character of the 



riiillfK 2. — Top ■ iews of h,';i 1.- i;f OMirinii'ui: ii. (>. ■isUiiiuii: h. (>. initrxJhiUi: c. <). ciifii :itci iicla 



terminal portion of the main body of each spicule. In (htertagia the 

 ventro-ventral and latero-ventral rays are close together and parallel, 

 tlunr tips being in relation with a more or less conspicuous indenta- 

 tion of the margin of the bursa. In the genus Parostertagia the 

 ventro-ventral and latero-ventral rays are widely sejjarated, the tip 

 of the former ray ])eing in I'elation with a rather conspicuous pro- 

 tnl)erance of the margin of the bursa. In this genus, also, the tips 

 of the main body of the spicules are pointed and are not embedded 

 in I'ounded cuticular cushions, whereas in Ostertagia the correspond- 

 ing ])ortions of the spicules are trimcated and are embedded in a 

 terminal blunt cuticular cushion. Also, Parostertagia has three 

 well-defined lips, wdiich appear but feebly developed in three species 

 of Ostertagia examined by the writers, as noted elsewhere in this 

 l)a|)er. 



FAROSTERTA(;iA HETEKOSPICULUM, new species 



Specific diagnosis.. — Parosteragia: Characters of genus. The head 

 is |)jovided with four j-elatively large submediari j^apillae and two 

 smaller- latei-al papillae, or nnipliids. The mouth is surrounded l)y 



