1885.] NATURAL SCIENCES OF PHILADELPHIA. 123 



S. trutta, and other fishes of the kind. The specimens are all 

 mature; the segments from near the head throughout being dis- 

 tended with brownish eggs. The characters of the worm arc as 

 follow: — Body linear, band-like, widest just behind the head, and 

 gradually narrowing to the posterior extremity, thickened along 

 the middle and to a less degree along the lateral borders, which 

 are narrowly obtuse at the free edge, apparently continuous but 

 irregularl}' crenulate ; the broad surfaces transversely wrinkled, 

 with the lateral borders defined from the middle by longitudinal 

 striae ; anterior extremity wider and transversely convex ; pos- 

 terior extremity obtusely rounded. Head small, oval, equitant 

 across the anterior border of the body, with an oval bothria 

 fore and aft, directed obliquely from the broad surfaces of the 

 body. No distinct neck. Segments of the body commencing 

 immediately after the head, wider than long, indistinctly defined 

 at the lateral margins and most marked transversely along the 

 middle of the body, becoming narrower and slightly longer at 

 the posterior part of the latter, fertile throughout, and furnished 

 on one side of the body, in the median line, with a prominent 

 penal papilla and just behind with a genital pore. Animal whitish 

 with a median chain of brownish spots due to the ova-distended 

 uteri. 



In a specimen of eight inches in length, the anterior extremity 

 of the body is 3 mm. wide ; at the middle 2 mm. ; and at the 

 posterior extremity l - 5 mm. The head measures 0*16 mm. 

 transversely and 0*18 mm. deep or long on the broad aspect of 

 the worm. The segments generally measure about 0*(>25 mm. 

 long. The ova are brownish, oval, and 0*04 mm. long by - 024 

 broad. 



The second vial contains a single worm, and is labeled, " Taken 

 from the intestine of a Trout, Aug. 29, 1882." This worm I sus- 

 pect to represent an immature stage of the former. It is 30 mm. 

 long, and in shape resembles a fluke-worm or a leech. It is elon- 

 gated elliptical, flat, widest in front, with the lateral margins 

 apparently entire, the broad surfaces transversely striated, and 

 longitudinally divided in three bands, with the median band indis- 

 tinctly divided into segments, on one surface in the median line 

 provided each with a minute pore. Head oval, situated fore and 

 aft across the' anterior transversely convex border of the body ; 

 with a minute oval bothria fore and aft. Caudal extremity nar- 

 rowest, transversely convex at the end, and emarginate or with a 

 pore. Breadth at fore-part 3 mm. ; at back part 2 mm. The 

 species may be named Bothriocephalus (Dibothrium) cestus. 



The following were ordered to be printed : — 



