n. A FAUNA WITHIN ANIMALS. 47 



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

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

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



Measurements. — Length of body -^-^ to | of an inch; breadth at middle -^j of an 

 inch. Tail -j^ of an inch in length by y-gi^^ of an inch broad at middle. Buccal 

 organ i line long by j^-^ of an inch broad ; gizzard ^-^-^ of an inch long. 



Ova -^^-g of an inch long by -^^-^ of an inch broad. 



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

 marginatus. 



3. Thelastomnm appendienlatum, Leidt. 



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



Stn. Oxyuris Blattm orientalis, Hammerschmidt : Naturwiss. Abhandl. von Haidingee, I. 284, Taf. x. 

 Figs. 10-12 {mak, 8, 9, 20 ?). 



(Plate VII. Fig. 3.) 



Female. — Body cylindroid, 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 cylindroid and sending off 

 a large diverticulum. Generative aperture 26 annulations anterior to the anal. 



Measurements. — Length of body 1 line to Jj- of an inch ; breadth at commence- 

 ment of the ventriculus y^-g- of an inch ; at middle -^ of an inch ; at anus ^67 ^^ 

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

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

 in length by g^^g- of an inch broad. 



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

 orientalis. 



3. Thelastomum labiatum, Leidt. 



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



(Plate VII. Fig, 13.) 



Female. — Body cylindroid, 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 cylindroid; the latter robust; intestine at com- 

 mencement subcordiform. 



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

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

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



