46 A FAUNA WITHIN ANIMALS. H. 



EalUation. — Found withiu the large intestine of Julus marginatus, and less fre- 

 quently within the ventriculus. 



2. Streptostoiniim gracile, Leidt. 



Proc. Acad. Nat. Sci., v., 100 ; ib. v., 285. 



Sy.v. Oxyiiris Diesingii, Ilammerschmidt: Isis, 1838, 354, Taf. iv., Fig. 6. 



Oxyuris Blattce Orientalis, Hammerschmidt: Naturwissenschaftliche Abhandlungen von IIaid- 



iNGER, I. 284, Taf. s., Figs. 4, 7, 13-15. 

 Aaguilhda macnira, Diesing: Systema Helminthum, II. 134. 



(Plate VII. Fig.s. 6, 7.) 



Female. — Body cylindroid, attenuated from the middle anteriorly and posteriorly. 

 Anterior annuli very long and movable upon one another ; posterior annuli shorter 

 and not so distinct. Oral annulus short, simple ; second annulus long, constricted in 

 the middle. Tail nearly one-third the length of the body, straight or curved, spi- 

 culate, shining. Mouth round, simple ; buccal organ elongated pyriform, with the 

 neck cylindroid, dilated at its commencement and middle, extending through ten 

 aunuh ; gizzard with a narrow cylindroid neck and globular body, extending to the 

 eighteenth annulus; intestine cylindroid, very largely dilated oval at commence- 

 ment. 



Measurements. — Length of body 1 line ; breadth opposite the ventricular dilatar 

 tion -j^ 5 inch ; greatest do. ^^y inch; just above anus -^^-^ inch. Tail ^jJ^,^ inch 

 long by the -^^-^-^ inch broad at middle. Buccal organ yJ-^ inch long; gizzard -^{^ 

 inch long. Ovum oval, gi^ inch long, g J^ inch broad. 



Habitation. — Found within the intestinal canal of Blatta orientalis. 



§ 5. Description of the Genus and Species of Thelastomum. 



THELASTOMUM, Leidy. 

 Body cyhndroid, annuli moderately long. Oral annulus papilla^form. Mouth 

 small, circular, without lobes or other appendages; buccal organ long, cylindrical; 

 gizzard pyriform. Tail moderately long, spiculate. Penis consisting of a single 

 spiculum. 



1. Thelastoiuuiu aUciiiiattini, Leidy. 



Proc. Acad. Nat. Sci., iv., 231 ; ib. v., 285. 



(Plate VL Fig. 4; VII. 1, 23. 



Female.— S,oAy cylindroid, translucent white, shining, attenuated anteriorly from 

 the commencement of the intestine, divided into from 140 to 160 annulations. 

 Oral annulus minute, papilUcform ; second annulus small, compressed oval. Tail 

 very straight, or slightly curved, slender, spiculate, acute. Mouth small, simple ; 

 Its passage extending through two and a half annuli ; buccal organ and gizzard 

 extendmg through 55 annulations, the former, very long, cylindrical, rounded at 



