616 W. S. NICKERSON, 



Macraspis Stichocotyle 



Single testis, near posterior end. Two testes in middle region ot' 



body or farther forward. 

 Ovary far forward. Ovary in middle region of body 



or farther forward. 

 Sexual aperture median. Sexual aperture on right of median 



line. 



Of the differences mentioned that in the number and position of 

 the testes is doubtless to be regarded as the most iraportant and will 

 probably be found to be accompanied by other differences in the re- 

 productive Systems. Monticelli's objection to the recoguition of the 

 genus Stichocotyle^ tho' valid when made, can no longer be maintained 

 and the genus is therefore entitled to füll recognition. 



Family Aspidohothridae Burm. 1856. 

 Body variously shaped, elongated or short, cylindrical or flattened. 

 Ventral surface bearing a large oval or elongated Compound adhesive 

 Organ composed of numerous alveoli arranged in one or in several 

 rows or the adhesive organ may be represented by a series of numer- 

 ous simple acetabula in a Single longitudinal row. Chitinous hooks 

 or similar structures lacking. Mouth terminal or subterminal not 

 surrounded by an oral sucker. Pharynx present; intestine simple, 

 tubulär or saccate, surrounded by a Single or double muscular sack 

 developed in the parenchyma; when the sack is double a part of the 

 genitalia lie ventrally between the outer and inner sacks. Single 

 aperture for both male and female genital Systems situated in or near 

 the midventral line anterior to the adhesive organ or to the foremost 

 acetabulum. Uterus usually long and tortuous. Ovary of medium 

 size. Testes one or two posterior to ovary. Laurer's canal present 

 or absent. Yolk glands extending for some distance longitudinally 

 near the lateral margins of body either as continuous masses or as 

 numerous separate follicles. Eggs without filaments, usually numer- 

 ous. Excretory System opening by a dorsal pore near posterior end. 

 Excretory vesicles paired extending forward a longer or shorter distance 

 near each side. Development direct with simple metamorphosis. 



Live as parasites in the intestinal tract or gali bladder and bile 

 ducts of fishes and turtles as well as upon the bodies or in various 

 Organs of Mollusca. 



