206 ^ , ' [May, 



tuse tail, l-5th of a line long from the anus. Whole length 4 inches 3 lines: 

 breadth 1 and l-5th lines. 



Male. Cylindrical, attenuated towards the extrennities ; posterior extremity- 

 incurved, without appendages ; tail short, curved. Length2 inches ; breadth |ths 

 of a line. 



Habitation. A male and female found in the intestine of Mephitis americana. 

 Received from Prof. S. F. Baird, Carlisle, Pennsylvania. 



Remark. It corresponds in every particular except in size, being twice as 

 large, with the Ascaris alienata obtained from Nasua rufa, described by Ru- 

 dolphi. 



2. Ascaris entomelas, n. s. Body cylindroid, attenuated at each extremity, 

 curved, whitish, with the black intestine visible through the translucent integu- 

 ment, without membranous appendages. Generative aperture posterior to the 

 middle. Tail conical, pointed, l-18th line long. 



Length of female 1 to U lines; breadth, ith of a line. 



Ovum 1.333d in. long; l-500th in. broad. 



Habitation. Lungs of Rana halecina. 



Remarks. Very distinct from Ascaris nigro-venosa, Zeder, which is three 

 times as large, and possesses membranous appendages. The largest females, with 

 the oviducts distended with eggs of Ascaris entomelas, do not measure over IJ 

 lines. It is also not to be confounded with Angiostoma entomelas, Duj., which, 

 as a generic character, possesses a corneous capsule within the head. 



DisTOMiiM, Retzius. 



3. DisTOMUM LONGUM, M. s. Body whitish, with the blackish ovaries showing 

 through the anterior two-thirds, sub-cylindrical, compressed ; posteriorly sub-lig- 

 ulate, or spatulate, obtusely rounded ; neck cylindrical. Oral acetabulum ob- 

 liquely terminal, urceolate, broader than the neck, 3-5ths of a line in diameter. 

 Ventral acetabulum, a little smaller, and from Ij to two lines behind the former, 

 orbicular, projecting, 5 a line in diameter. Generative aperture just anterior to 

 the middle of the neck, or nearer the oral acetabulum. 



Length 15 lines to 3 inches ; breadth, 2-5ths to aths of a line. 



Habitation. Six individuals found in the mouth of Esox estor, Cleveland, Ohio. 

 Received from Prof. S. F. Baird. 



Remarks. This is a remarkable species of Distomum from the very great rela- 

 tive length to the breadth. 



4. Distomum TERRETicoLLE,K^i^. Entoz. Syn. p. 102; Diijardin^ Hist. Nat.des 

 Helm.; Diesi7ig, Syst. Helm. p. 358. 



Body subcylindric, light flesh color, posteriorly rounded. Ventral acetabulum 

 Iths of a line behind the oral, ^d line in diameter. Oral acetabulum, ith of a 

 line. 



Length, 8 lines; breadth posteriorly, i line, anteriorly, id line. 



Habitation. Stomach of Esox reticulatus, Lesueur. 



Remark. The generative aperture is placed immediately in advance of the 

 ventral acetabulum. When the animal contracts, the two acetabula are nearly 

 brought into contact. 



