562 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 57. 



testes. Ovary globular or oval, on right side of median line in front 

 of seminal receptacle. Vitellaria not extending anterior of region 

 of genital pore. Coils of uterus frequently overlap the intestinal 

 ceca, but usually do not extend in front of genital pore. Eggs not 

 over 25 (jl long. 



Type species. — Ascocotyle coleostoma (Looss, 1896) Looss, 1899. 



KEY TO SPECIES. 



1. Intestinal ceca short, do not extend back of posterior border of ventral 



sucker 2. 



Intestinal ceca extend a considerable distance behind the level of the ven- 

 tral sucker 3. 



2. Mouth surrounded by a double crown of spines ; vitellaria extend forward 



into region of the ventral sucker Ascocotyle coleostoma. 



Mouth surrounded by a single crown of spines ; vitellaria do not extend 

 anteriorly beyond the level of the ovary Ascocotyle minuta. 



3. Circumoral spines about 70 fi long ; some of uterine coils in front of genital 



pore Ascocotyle angrense. 



Circumoral spines less than 25 im long; uterus limited to region between 

 testes and genital pore 4. 



4. Oral cecum more than half the length of the prepharynx ; circumoral spines 



16 to 24 iM long Ascocotyle longa. 



Oral cecum less than half the length of the prepharynx; circumoral spines 

 less than 15 /* long Ascocotyle nana or Ascocotyle italica. 



ASCOCOTYLE COLEOSTOMA (Looss. 1896) Looss. 1899, 

 Fig. 31. 



1896. Distomum eolcostomum Looss, 1896b, pp. 101-106. 154, pi. 7, figs. 



66-68 (in pelican; Egypt); 1899&, pp. 578, 581, 585 (type of 



Ascocotyle). 

 1899. Ascocotyle coleostoma (Looss, 1896) Looss, 18995, pp. 582, 585, 699 



(type of Ascocotyle). 



Specific diagnosis. — Ascocotyle: Length, 0.7 to 0.8 mm.; maximum 

 width, 0.25 mm. Cutaneous scales, 5 [jl long. Mouth surrounded 

 by a double crown of spines, 16 in each row, those of the anterior 

 row 13 [JL long, those of the posterior row a little shorter. Dorsal 

 lip prolonged anteriorly in a short triangular process. Oral sucker, 

 90 [JL in diameter; cavity funnel-like, continuous posteriorly with 

 a hollow tapering process 230 [jl long, usually bent in the form of 

 an S. Pharynx, 60 [jl long by 50 [l wide, immediately in front 

 of the bifurcation of the intestine. Branches of intestine very 

 short (150 [jl), terminating in front of the level of the ventral sucker. 

 Ventral sucker about midway of the body in contracted specimens. 

 Testes irregularly round or oval; maximum diameter, 70 [jl. Ovary 

 irregularly^ spherical; maximum diameter, 60 [x. Seminal receptacle 

 posterior of ovary, spherical, 80 [jl in diameter. Vitellaria in lateral 

 fields extending from the level of the anterior borders of the testes 

 to the level of the genital pore. Transverse vitelline ducts at about 



