2 PROCEEDINGS OF THE N^ATIONAL MUSEUM vol.79 



rior fourth of the body, the right cauJad of the left. The left testis 

 is 180/x to 187m ill diameter and the right 150/x to 160/x long by 

 187/A to 210/x wide. Seminal vesicle well developed, S-shaped, and 

 situated in the median line caudad of the acetabulum. Ovary globu- 

 lar or slightly ovoid in shape, 75/x to 97/a in greatest diameter, situ- 

 ated a short distance in front of the anterior testis and to the right 

 of the median line. Seminal receptacle ovoid, 50/x to G7/a long by 

 60/A to 82/x, wide, and situated immediately caudad of the ovary. The 

 vitellaria are composed of relatively large follicles, which extend 

 anteriorly to about 150/x to 155/a caudad of acetabulum; posteriorly 

 they extend to the posterior end of the body and almost completely 

 fill the post-testicular space. Uterus with relatively few loops and 

 confined to the intercecal space between ovary and acetabulum. Eggs 

 ovoid, 33/* long by 25/t wide, with yellowish-brown shells. 



Host. — California gull {Lm^us calif ornicus). 



Location. — Lower part of small intestine. 



Distribution. — United States (Klamath Falls, Oreg.). 



TyY)e s/jemwe/i.— U.S.N.M. Helm. Coll. No. 29245; paratypes No. 

 29779. 



Figure 1. — Apophallus crami, new species. Ventral view 



Remarks. — ApopTiaUus crami resembles A. miihJingi ( Jiigerskiold) 

 more closely than it does any of the other species of the genus, the 

 principal difference between the two being in the extent of the vitel- 

 laria anteriorly. In A. miihUngi the vitellaria extend anteriorly to 

 the level of the acetabulum, while in A. crami they stop abruptly at 

 or near the level of the posterior end of the seminal vesicle. Other 

 minor differences exist, but they are not regarded as being of par- 

 ticular specific value. The distribution of the vitellaria appears to 

 be a constant character in members of the genus. In the species 

 described in this paper, about 100 specimens were examined, and the 

 variation as regards this character was found to be insignificant. 

 In one specimen the vitelline follicles on the left side were found to 

 extend as far anterior as the acetabulum, but on the right side they 

 <lid not extend beyond the posterior margin of the seminal receptacle. 

 This specimen was clearly an anomalous one and of no significance 

 so far as the constancy of the distribution of the vitellaria is con- 

 cerned. 



