NO. 14 MANTER : DIGENETIC TREMATODES OF FISHES 397 



Yamaguti's form agrees well with the above except in two respects. 

 The vitellaria extend slight!}^ farther forward, reaching a level about op- 

 posite the middle of the cirrus sac; and the metraterm is inconspicuous 

 and evidently thin walled. My specimens of Yamaguti's forms show the 

 cirrus sac joining the metraterm posterior to the acetabulum so that the 

 genital atrium is actually as long as in my material. The position of the 

 ovary is like that in the form from Seriola species but unlike that in the 

 form from S. dorsalis. The number and probably the arrangement of the 

 oral spines, the sucker ratio, and the egg size probably differ only within 

 the range of individual variation. All forms have a uroproct. The position 

 of the ovary is usually constant, but, since one specimen showed it sepa- 

 rated from the anterior testis by only a few vitelline follicles, it is not 

 urged as a significant character here. The character which might most 

 validly distinguish the Japanese form is the slightly more anterior extent 

 of the vitellaria. 



The specimens from Elagatis (a genus closely related to Seriola) are 

 like those from Seriola species, although only 38 oral spines could be 

 counted in one specimen. 



Stephanostomum anisotremi, new species 

 (Plate42, figs. 81, 82) 



Host: Anisotremus scapularis (Tschudi) 

 Location: Intestine 



Locality: Tagus Cove, Albemarle Island, Galapagos 

 Number : 1 6 specimens from a single host 



The following diagnosis is based chiefly on 4 specimens favorable for 

 measurement. The other specimens were also studied and found to agree 

 in all characters which could be determined. The cylindrical nature of the 

 body often resulted in lateral views of total mounts. The oral spines had 

 been partly lost in a few specimens. Two specimens (one broken) of 

 another (undetermined) species with 32 oral spines and with vitellaria 

 almost to the acetabulum occurred in the same collection. 



SPECIFIC DIAGNOSIS OF STEPHANOSTOMUM ANISOTREMI 



Length 2.808 to 3.874; width 0.450 to 0.532; body elongate and 

 cylindrical. Body spination to level of posterior testis becoming sparse 

 posteriorly. Forebody 0.652 to 0.810, about % to V^ total body length 

 except when greatly extended, when it may be almost Yz body length. 



