46 RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 



with a broad, inflated, lateral, alaform expansion of the integument, 

 pierced on each side of the body with five minute respiratory tubes 

 opening at the free edge of the expansion. Integument on the ven- 

 tral surface, between the lateral expansions, presenting a number of 

 elevated, longitudinal, moderately tortuous, papillated, linear ridges. 

 Mouth small, round. CEsophagus long, cylindrical. Intestine sim- 

 ple, tortuous. Anus small, oval, situated about half the length of 

 the alary expansion, from the posterior end. 



Length 1 1 lines ; breadth 3-5ths of a line. Transverse stride of 

 integument i-65oth inch wide. CEsophagus 2 ^^4 lines long, i-5th of 

 a line broad. 



Habitation. — The description is taken from two males found within 

 the stomach of Didelphis virginiana. 



4. Spiroptcra Scalopis canadensis. — Body whitish, cylindrical ; ante- 

 riorly attenuated ; posteriorly re-curved ; furnished at the extremity 

 with a lateral dilated alary expansion, containing four minute respir- 

 atory tubes, diverging from the position of the anus. Mouth small. 

 CEsophagus cylindrical ; intestine moderately tortuous. Anus about 

 half the length of the alary expan.sion from the posterior end. 



Length 6 lines ; breadth 54^ of a line. CEsophagus Y:^ of a line 

 long. 



Habitation. — Description from a single male found in the stomach 

 of Scalops canadensis. 



5. Echinorynchus socialis. — Body white, cylindrical, with a dilation 

 of the anterior fifth ; narrowed posteriorly, with a white spiral band 

 passing around the whole length, and giving the appearance of 

 transverse annulations. Proboscis moderately long, cylindrical, with 

 twenty-six transverse rows of simple re-curv^ed booklets, sixteen in 

 each row. 



Male furni.shed with a posterior vesicular appendage. 



Length from )^ an inch to 2 inches 4 lines ; breadth of larger in- 

 dividuals anteriorly 2-3ds of a line ; posteriorly 2-5ths of a line. 



Habitation. — Found frequently in considerable numbers in the in- 

 testine Platessa plana. 



[May, 1851. No. 75. See Bibliography.] 



Dr. Leidy remarked that in a recent visit to Dr. Wilson, near 

 Newark, Delaware, while rambling in a neighboring wood, upon 

 turning over a log he discovered a mole cricket {Grillo-ta/pa ameri- 

 cana^ standing very quietl}' at the mouth of a hole. Upon taking it 

 up the animal exhibited no signs of movement, though perfecth' 

 fresh and lifelike in appearance. He took it home and next morn- 



