RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 87 



and neck buried in tumors, as in the case of the attachment of 

 Echinorhyuchi. Variety b is found detached in the mucus of the 

 lungs and trachea. Common ; obtained in December, when the 

 water snakes were hybernating. 



22. Distomiwi Horrid uin,he\dy; Distoma /iorridu}n,X,Q\dy . Journ. 

 A. N. S., 2d ser. , i, 303. From the excretory duct of the kidneys 

 of the boaconstrictor. 



23. Dhtomum I'ariegatum, Rud ; Leidy. Pr. A. N. S., v, 207. 

 From the lungs of the Ra/ia pipie?is. 



24. Distoimim Rctusum Dug. Leidy, Pr. A. N. S., v, 207. From 

 the intestine of Rana haled na. 



25. Distomum Cygnoidcs Zeder. Leidy, Pr. A. N. S., v, 207. 

 From the urinary bladder oi' Ranapipiens, R. Pahcstrus, R. halecma ; 

 Salamandra macula fa, S. rubra, S. sabnonca. 



26. Dislomnm Longum Leidy. Pr. A. N. S., v^ 206. From the 

 mouth of Esox eslor. 



27. Distormim Terrcticollc Rud. Leidy, Pr. A. N. S., v, 206. 

 From the stomach of Esox retuulatus. 



28. Dislomum Incivile, Leidy. Body flat, elongated elliptical ; 

 echinated between the oral and ventral acetabula, which are equal, 

 and the latter one is hemispherical and sessile. Length 2^^^ to 3 

 lines, breadth, 3-5ths to 4-5ths of a line. Obtained from the intes- 

 tine of Leiostonncs obliqicus. 



29. Distomum Clavatum f Rud. Bodj- pyriform, transversely an- 

 nulated, plicated. Neck curved conical, 3 lines long. Ventral 

 acetabulum oblique, prominent, at the base of the neck, 3 lines in 

 diameter, with a circular aperture much larger than the mouth. 

 Length i inch, breadth 4 lines. One specimen in the collection of 

 the Academy. Locality unknown. 



30. Distomum J'agajis Leidy. 



Distoma helicis Leidy. Pr. A. N. S., iii, 220. 

 Distomion pcricaj'dium, Q.re'^lm. Arch. f. Naturg. xv, 78. 

 DistotJia vagans, Leidy.' Journ. A. N. S., 2d ser., i, 304. 

 Cercariacum helicis alternatcv, Diesing. Rev. d. Cere, 24. 

 Cercariacum vagans, Diesing. Rev. d. Cere, 24. 

 Found in Helix alternata and in H. albolabris. 



CivINOSTOMUM, LKIDY. 



Head shorter than and separated from the body by a lateral con- 

 striction opposite the ventral acetabulum, compressed semi-oval. 

 Body compressed oval. Mouth anterior. Ventral acetabulum large, 

 hemispherical, immersed within the commencement of the body and 



