490 



I have found this species but once — seven large specimens far 

 back in the intestine of a perch. It agrees very accurately w^ith the 

 account given by Looss. 



44) Crepidostomum laureatum Zeder. 



Intes. Salvelinus fontinalis Mit. (Brook Trout). 



Smaller and slenderer than preceding. Ventral sucker 0,69 from 

 anterior end and perceptibly larger than oral, their dimensions being 

 0,20 and 0,26. Greater part of body often of uniform breadth, 

 narrowed in front of ventral sucker and behind second testis. Testes, 

 one a little behind the other and generally of irregular outline. 

 Ovary smaller and spherical, to one side mid-way between ventral 

 sucker and first testis. Uterus a duct lying in folds in the space 

 between the caeca at the sides and the ventral sucker and first testis 

 in front and behind. Eggs not numerous — 10 to 20. Vitellaria 

 from mouth-sucker to posterior end. Penis-sack extending behind 

 ventral sucker. 



This is the species occasionally reported from this continent 

 under the name of the preceding species. As varieties which I feel 

 almost forced to regard as species I may mention (1) one from the 

 perch [Perca flavescens Mit.) and the dory [Stizostedion vitreum Mit.), 

 with large regular testes flattened against each other and a little 

 obliguely placed, and with short penis-sack not reaching behind 

 ventral sucker. Some of these occurred in the same perch with Bu- 

 nodera nodulosa but far forwards in the intestine. These facts sug- 

 gest that they may be the young oi Bunodera, but they have scarcely 

 any resemblance to the young as figured by Looss especially in the 

 shape of the body and the character of the uterus. (2) One from the 

 duodenum of the Menobranch [Necturus maculatus Raf.), is still more 

 slender with ventral sucker, ovary and testes moved farther forward 

 in the body. 



45) Crepidostomum cornutum Osborn. 



Intes. Ambloplites rupestris Raf. (Rock Bass). 



1,57X0,26. Oral sucker 0,246X0,230, ventral sucker 0,154 

 X0,154, its centre 0,69 from anterior end. Large anterior sucker 

 with ventral papillae directed transversely, and the other four for- 

 wards. Small ventral sucker, slim body, long penis-sack, small testes 

 far back, and vitellaria beginning at the posterior end of a tolerably 

 long oesophagus. Numerous cysts, 0,68 in diameter, from the region 

 of the heart of Cambarus enclosed immature worms apparently of 

 this species. They agree in relative measurements and disposition 



