II. A FAUNA WITHIN ANIMALS. 47 



the extremities ; the latter pyrifonn, with a short neck, and narrower than the 

 buccal organ; intestine cjHndrical, dilated, subcordiform at commencement; rectum 

 inverted pyriform. Generative aperture 42 annulations anterior to the anal. 



Measurements. — Length of body ^rr to | of an inch ; breadth at middle J^ of an 

 inch. Tail Jj of an inch in length by ^J^^ of an inch broad at middle. Buccal 

 organ I line long by -^i^ of an inch broad ; gizzard y|^ of an inch long. 



Ova ^ig of an inch long by ^^^ of an inch broad. 



Habitation. — Found with Strcptostomum agile, within the large intestine of Julus 

 marginatus. 



S. Thclaf^toninm appendiciilafiiiii, Leiby. 



Proc. Acad. Nat. Sci., v., 101 ; ib. 285. 



Syn. Oxynris BlaUm oricnialis, Hammerschmidt : Natur-wiss. Abhandl. von IIaidinger, I. 284, Taf. 3. 

 Tigs. W-12 [male, 8, 9,20?). 



(Plate VII. Fig. 3.) 



Female. — Body cyliudroid, translucent white, attenuated anteriorly and poste- 

 riorly ; divided into from 80 to 90 annulations. Oral and second annulus, as in the 

 preceding species ; terminal annulus with two short spines projecting backward. 

 Tail straight, spiculate, one-fourth the length of the body. Mouth small, simple ; 

 its passage extending to the third annulus ; buccal organ and gizzard extending to 

 the thirtieth annulation ; the former long, cylindrical ; the latter pyriform ; com- 

 mencement of the intestine broad, cordiform, becoming cyliudroid and sending off 

 a large diverticulum. Generative aperture 2G annulations anterior to the anal. 



Meastcrements. — Length of body 1 line to Jq- of an inch ; breadth at commence- 

 ment of the ventriculus ^J ^^ of an inch ; at middle -^jj of an inch ; at anus ^^^ of 

 an inch. Tail i of a line long by -^1^ of an inch broad at middle. Buccal organ 

 ■^ of an inch long ; gizzard 2^^^^ of an inch long. Ovum semi-oval, -^^-^ of an inch 

 in length by gig of an inch broad. 



Habitation. — Found with Strcptostomum gracile in the intestinal canal of Blatta 

 orientalis. 



3. Tlielastoiniiin labiatiiin, Leidy. 



Proc. Acad. Nat. Sci., v. 101 ; ib. 285. 



(Plate VII. Fig. 13.) 



Female. — Body cyliudroid, transparent, anteriorly and posteriorly attenuated, 

 divided into 140 annulations, of which the anterior are very strongly marked. Oral 

 annulus inflated, six-lobed at the margin ; second annulus constricted anteriorly. 

 Tail straight, spiculate, very nearly half the length of the body. Mouth round, 

 extending through one and a half annuli ; buccal organ and gizzard extending to 

 the fortieth annulus ; the former cyliudroid ; the latter robust ; intestine at com- 

 mencement subcordiform. 



Measurements. — Length J of a line to tjV of an inch ; breadth ^ J^ of an inch. 

 Length of tail -^^ of an inch. Buccal organ y|^ of an inch ; gizzard j^^ of an 

 inch. Ovum oval, ^^-^ of an inch long by ^J^ of an inch broad. 



