DIGENETIC TREMATODES — MANTER AND VAN CLEAVE 



329 



Genital pore median (gp, pi. 13, fig. 13) , immediately preacetab- 

 ular Testes (t) tandem in posterior third of body, elongated, 

 separated by a few vitelline follicles; cirrus sac slightly smuous 

 extending 0.511 mm. posterior to acetabulum or approximately 

 one-third distance to ovary. Ovary (ov) elongate, about two-thirds 

 body length from anterior end; separated from anterior testis by 

 a few vitelline follicles. Vitelline follicles (v) extending anteriorly 

 to a point shghtly beyond midway between base of cirrus sac and 

 acetabulum although not quite so far on one side; not reaching 

 acetabulum; not interrupted opposite testes; dorsal, ventral, and 

 lateral to ceca; dorsal to testes and ovary but not to the uterus. 

 Uterus preovarian; metraterm not evident; eggs very large, ovoid, 



94 to 109/. by 43 to 58/x. 



Host.—Umbrina roncador Jordan and Gilbert, yellowfin croaker. 



Location. — Intestine. 



Holotype.—V.S.^M. Helm. Coll. No. 37149. 



Discussion.-This species differs from most other Stephanos- 

 tomum species in its very large eggs. It seems to be most like 

 S. cesticillum (Molin, 1858) Looss, 1899 and S. hicoronatum 

 (Stossich, 1883) Manter, 1940, which it resembles m number o± 

 oral spines and extent of vitellaria. S. hicoronatum differs m that 

 the oral sucker is only one-half the diameter of the acetabulum 

 the cirrus sac extends halfway to the ovary, a metraterm is well 

 developed, and eggs are about 80^ by 50 to 55/x (or 63 to 78,. by 

 33 to 45,. according to Yamaguti (1938). S. cesticillum has eggs 

 80a by 50 to 55/x, an oral sucker only slightly smaller than the 

 acetabulum, and a cirrus sac extending more than half way to the 

 ovary, a conspicuous metraterm, and its oral spines are at least 

 usually interrupted ventrally by a spine lacking or by small spines. 

 S. imparisvine (Linton, 1905) Manter, 1940, has 33 or 34 oral 

 spines but differs in that the vitellaria do not extend so far an- 

 teriorly, do not extend between the gonads, and the eggs are only 



70 by 40/. in size. . 



Species that also have large eggs are S. ]aponicum (Yamaguti, 

 1934) which differs in that the vitellaria extend to the acetabulum 

 and there are 46 oral spines; S. triglae (Lebour, 1908), differing 

 from S. calif ornicum in these same respects; and S. baccatum 

 (Nicoll, 1907) , which has 56 oral spines and tapered eggs. 



STEPHANOSTOMUM DENTATUM (Linton, 1900) Manter. 1931 



Echinostephaniis pagrosomi Yamaguti, 1939, p. 221. 

 Stephanostonmm pagrosomi (Yamaguti, 1939) Manter, 1947, p. 308. 



Host.—Paralichthys calif ornicus ( Ayres) ,' California halibut. 

 Location. — Intestine. 



' New host record. 



