356 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



a claviform posterior portion extending to the ovary and overlapping 

 that organ sh'ghtly dorsally. The basal portion contains a wide convo- 

 luted seminal vesicle, the narrow portion a smaller less convoluted tube, 

 and the anterior portion a sinuous ejaculatory duct. Tall cells of a pros- 

 tatic vesicle are lacking; prostatic cells are present but few. The un- 

 spined, muscular ejaculatory duct opens into a spacious genital atrium at 

 the tip of a large blunt papilla. 



Ovary ovoid, unlobed, pretesticular, slightly to the right, just median 

 to right cecum; Laurer's canal probably present; uterus to the left of 

 ovary and preovarian, extending to left of acetabulum ; a saclike seminal 

 receptacle apparently present but sperm cells also in uterus. Metraterm 

 narrow, straight, unspined, opening into atrium at base of male papilla; 

 vitelline follicles large, from intestinal bifurcation to posterior end of 

 body, dorsal, ventral, and lateral to ceca, confluent posterior to testes 

 and dorsally between acetabulum and pharynx. Eggs thin shelled, almost 

 colorless, 60 to 70 by 31 to 37 [x. Excretory vesicle extending to ovary. 

 Sinuous lymphatic vessels present (probably four longitudinal vessels). 



The name balistis is for the host. 



Comparisons. This species differs from both the other two species 

 in more anterior extent of the vitellaria, in diagonal testes, in dextral 

 ovary, in more posterior extent of the cirrus sac, and in presence of a 

 seminal receptacle. There is some question as to the exact nature of the 

 seminal receptacle in P. balistis; in the specimen sectioned it seemed to 

 contain one or two eggs, and in the total mount its connections could not 

 be made out. It may be a saclike outpocketing of the uterus. 



Until more is known of the lymphatic system in the 3 forms, this 

 species should be considered only tentatively in the genus. The taxo- 

 nomic status of the genus will be of some interest if all species are found 

 to possess a lymphatic sj^stem. At present, the family connections appear 

 to be with the Allocreadiidae (subfamily Lepocreadiinae). However, as 

 has been stated, resemblance to Acanthopsolus should be noted. The chief 

 conspicuous difference seems to be the unspined cirrus and metraterm, 

 while in addition the body is stouter, the eggs smaller, and the pharynx 

 probably different. 



Pseudocreadium scaphosomum, new species 

 (Plate 35, figs. 28, 29) 



Hosts: Balistes polylepis Steindachner (type host) 



B. verres Gilbert and Starks 

 Location: Intestine 



