4 PROCEEDINGS OF THE ISTATIOITAL MUSEUM vol.73 



with an accessory branch. The spicules are equal and alate ; a guber- 

 naculum is present. The vulva and anus are fairly close. The va- 

 gina is relatively long and is connected with two parallel ovejectors. 

 The uteri are parallel. 



The genus Oesophagostomoides is related to the genus Oesophagos- 

 tovvn/ni, differing primarily from the latter in two important char- 

 acters as follows: (1) Oesophagostomoides lacks a ventral cervical 

 groove, which is a primary diagnostic characted of the genus Oesoph- 

 agostomwm and (2) the ovejector apparatus of Oesophagostomoides^ 

 which resembles that of the genus Phacochoerostrongylus^ is a simp- 

 ler structure than that of O esophagostornum. In the latter each 

 uterus opens posteriorly into an ovejector, the two ovejectors opening 

 into a kidney shaped pars ejectrix which in turn con^nunicates with 

 the vagina. In the genus Oesophagostomoides the ovejector apparatus 

 is relatively simple, the two ovejectors, which are continuous with the 

 uteri, opening directly into the vagina. ." •;-)"':< 



The specific name 0. giltneri is proposed for the species from 

 Phascolo7nys mitcheUi as an appreciation of Doctor Giltner's kindness 

 in turning these specimens over to the writer for determination. 



OESOPHAGOSTOMOIDES GILTNEKI, now spcchs 



The cuticle behind the mouth collar is slightly inflated. The 

 buccal capsule is as deep as or somewhat deeper than broad and is 

 supported by cliitinous walls the appearance of which in optical 

 section is shown in Figure 5. The external leaf cro^vn contains 8 ele- 

 ments. (Fig. 2.) The nerve ring is located anterior to the middle 

 of the esophagus, and the cervical papillae are located posterior to 

 the nerve ring, their position being variable. In two well preserved 

 specimens a definite constriction of the cuticle in the esophageal 

 region was observed, the position of the cuticular constriction cor- 

 responding approximately to the beginning of the second fourth of 

 the esophagus. Whether this constriction is also jjresent in other 

 specimens could not be definitely determined owing to the condition 

 of the specimens, many of which have a wrinkled cuticle as a result 

 of having become dry at one time. 



Male. — The male is from 10 to 11 mm. long by about 3T5/x in 

 maximum width. The diameter of the mouth collar is 84;u,. The 

 esophagus is from 587/x, to slightly over 630/x long by about 120/* in 

 maximum width. The nerve ring is located approximately at the 

 beginning of the third fifth of the esophagus. In a specimen in 

 which the esophagus is about 630/i long the nerve ring is located at a 

 distance of 264/j(, from the beginning of the esophagus. All the rays 

 of the bursa (figs. 3 and 4) are gradually attenuated and terminate 

 in pointed tips. With the exception of the externo-lateral and the 



