68 



THE TREMATODA 



FIG. XIII. A Group of Holostomiclae. 



1. Diplostomiim longum, Brds., from intestine of Brazilian crocodile (after Brandes), 

 ventral view. The anterior region of the body (A) is well marked off from the tail-like genital 

 region (B\ which is cylindrical. The latero-posterior margin (/) of A is slightly prominent. 

 The new adhesive organ (e) consists of a pit ; from the bottom rise glandular papillae (cf. 

 Fig. 5). 



2. Hemistomum clalhratum, Dies., from intestine of Liitra Irasiliensis (after Brandes). The 

 margin (/) of the fore body is curved inwards and partially conceals the accessory adhesive 

 organ (e), which has the form of a long ridge (cf. Figs. 4 and 6), the edge of which overhangs the 

 base and hides the ventral sucker (d). 



3. Holost. variabile, Nitzsch. (modified from Molin and Brandes), from intestine of various, 

 carnivorous birds. The margin (/) of the fore body has now bent round and fused to form 

 a cup from which the elaborate " accessory organ " projects. At the posterior end is seen 

 the " bursa copulatrix" (/) characteristic of the family with the genital sucker (m) and 

 papilla (p) carrying the genital pore. 



4. Transverse section of Hemistomum. c, intestine ; the numerous small circles are sections, 

 of the excretory canals which invade the organ. 



5. Longitudinal section of the fore body of Diplostomum, Brds., to show the prominent 

 hinder margin (/). 



6. Hemistomum. Longitudinal section of the fore body to show the foot-like accessory 

 organ e. 



7. Holostomum (after Brandes). Diagrammatic transparent view of the fore body. 



8. " Tetracotyle " (partly original). 



9. Side view of Polycotyle ornata, Wilh. -Suhm., from the gut of Alligator lucius (partly 

 diagrammatic, after Poirier). x, the several dorsal suckers of hind body. 



Letters common to all figures : A, fore body ; B, hind body or genital region, a, mouth and 

 buccal sucker ; fe, pharynx ; c, intestine ; d, ventral sucker ; e, accessory adhesive apparatus ; 

 e 1 , e 2 , its parts in Holostomum; f, the prominent and incurved margin of the fore body ; /', the- 

 cup produced ; g, uterus ; h, germarium ; i, testis ; j, sperm duct ; A;, prostate ; I, bursa 

 copulatrix ; m, genital (copulatory) sucker ; n, excretory pore and bladder ; p, genital papilla ; 

 s, glands in connection with accessory apparatus. 



