2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



posterior end of pharynx, slightly to right of median line. Cirrus 

 pouch jiiriforuL 120 fx long hy 52 /x wide at l)asc, containing a short 

 cirrus, pars ])rostatica and a large, glohular seminal vesicle. Testes 

 glohular, al)out 40 /x in diameter, with zones coinciding and fields 

 separate, intercecal, postequatorial. Ovary ahout 40 /x long by 28 jx 

 wide, to left of, and partly in zone of, acetal)nlunL Seminal re- 

 ceptacle and Laurer's canal not observed. Mehlis' gland median, im- 

 mediately postacetabular. Vitellaria extracecal. consisting of few, rela- 

 tively large follicles situated largely in same zone as acetabulum and 

 ovary. Uterus largely posttesticular. with two antero-laterally directed 

 looi)s on each side which extend into extracecal fields. Kggs oval. 

 24 jx long by 16 (x wide. 



Host. — Oplsthoncina ogliiiuin ( Le Seur} (J-vS 356). 



Location. — Pyloric ceca. 



Locality. — Fajardo Roads, near Fajafdo, Puerto Rico. 



Type specimen. — U.S.N.M. Helm. Coll. no. 8712. 



This s]')ecies belongs in the family F'ellodistomidae, subfamily Fello- 

 distominae, and has been placed in the genus .Steringotrcina despite a 

 number of dififerences that may ultimately necessitate the erection of 

 a new genus for its reception. Tn view of the fact that only a single 

 specimen was available for study, the writer does not feel justified 

 in proposing a new genus for this form at this time. Stcriugotrenia 

 ovata may be distinguished from all other species of the genus in 

 having an oral sucker that is distinctly larger than the acetabuluuL 

 the oral sucker being much smaller than the acetabulum in all other 

 species. 



PYCNADENA PIRIFORME, n. sp. 



Plate L fig. 2 



Description. — Body piriforuL ^'29 fx long and 420 /x wide. Cuticula 

 without spines. Oral sucker 140 fx long by 120 fx wide; acetabulum 

 224 fx long by 268 IX wide, aperture lOO /x long by 160 fx wide. Pre- 

 pharynx very shojt ; pharynx 80 /x long by 64 jx ^^•ide ; esophagus very 

 short; intestinal ceca relatively wide, extending to level of posterior 

 margins of testes. Geriitial aperture near left margin of body,' at. level 

 of anterior end of' pharynx. Cirrus pouch slender, 168' /x long by 

 48 /x wide at base. Testes more or less globular, about 80 /x in 

 diameter, with zones coinciding and fields jiartially overlapping, near 

 posterior end of body. Ovary globular, about 70 jx in diameter, 

 median.'ln same zone and fields as testes. Seminal receptacle small, 

 piriform, to right of vitelline reservoir. Vitellaria largely extracecal. 



