46 Papers from the Marine Biological Laboratory at Tortugas. 



ventral sucker inclosed in the posterior end of the cirrus-pouch ; prostate 

 gland not conspicuous, represented by cells in the walls of the cirrus- 

 pouch. Testes 2, close together, one following the other in the median 

 line near posterior end. Posterior testis usually long oval, with its long 

 axis corresponding to the long axis of the body; anterior testis smaller, 

 globular or subglobular, or oval; ovary at anterior border of anterior 

 testis, globular or oval. There is a seminal receptacle in front of the 

 ovary. The vitelline glands are diffuse, dense, filling the posterior part 

 of the body and often obscuring the other organs; they extend forward 

 to about the posterior end of the seminal vesicle, thus leaving a consider- 

 able area behind the ventral sucker where they do not occur. Folds of 

 the uterus between ovary and base of seminal vesicle; metraterm long, 

 parallel to the slender cirrus-pouch, and uniting with it near the genital 

 opening. The ova are relatively few and large; in preserved specimens 

 they are collapsed in the same manner as in Stephanochasmus casus, 

 that is, bv the formation of about 6 longitudinal furrows, producing a 

 ribbed appearance. The length of the ova in balsam is about 0.075 mm., 

 though measurements as great as 0.085 it^iti- were obtained. 



Host. 



Oral sk. Pharynx. Vent.sk. 



From 

 anterior 



end to 

 pharynx. 



From 

 anterior 

 end to 

 ventral 

 sucker. 



Length, i Breadth. 



Calamus calamus. . 



Do 



Haemulon plumieri. 



Do 



Do 



Haemulon sciurus . . 



Do 



o. 14 



O. II 



0.08 



0.30 I 

 0.30I 

 0.241 



0.2S 

 0.22 

 0.22 

 C.2I 



>.84 



..56 



).70 

 ).7o 

 ) .67 

 ).84 

 >.77 



3-64 

 1 .96 

 2 .91 

 2.28 

 2.66 

 3.78 



o.SS 

 0.42 

 0.30 

 0.38 

 0.30 

 0.47 



Host, Calamus calamus: 



1907, July 10, 2 fish, 9 distomes. 



1908, July 7, I fish, I distome; July 8, i fish, i distome; July 14, 



I fish, I distome. 

 Host, Hcemulon plumieri: 



1906, July 8, I fish, 2 distomes. 



1907, July I, 4 fish, I distome; July 3, 16 fish, i distome; July 12, 



II fish, I distome. 



1908, July 3, 2 fish, 2 distomes; July 6, 5 fish, i distome. 

 Host, Hcemulon sciurus: July 2, 1907, 3 fish, i distome. 



Lechradena edentula gen. et sp, nov. (Fig. 87.) 



Etymology: /.c//>t?, crosswise; w'^^jv, gland. 



A single distome evidently near the genus Stephanochasmus , but 

 without spines, is here described. It was found in a gray snapper 

 {Neomcenis griseus), July 5, 1906. 



