6 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 88 



One (U.S.N.M. No. 8148), collected July 1, 1924, from skin of 

 host, ventral side ; length, 14 mm. ; breadth, 8 mm. 



ENTOBDELLA HIPPOGLOSSI (O. F. Mailer) 



Plate 14, Figubes 164-169 

 See Sttles and Hassaix, U. S. Hyg. Lab. Bull. 37, p. 252, 1908, for references. 



I have records of this trematode from the skin of the halibut 

 {Hippoglossus hippoglossus) as follows: 



Record of collections.— Fouv (U.S.N.M. No. 8149), collected by 

 Vinal N. Edwards, June 15, 1906. In formalin specimens the suckers, 

 narrow margins of the body, testes, and genitalia in front of the 

 testes are white, elsewhere the color is purplish. 



Received from the U. S. National Museum two specimens on 

 December 7. Label: On halibut, Ward's Natural Science Establish- 

 ment; ace. 11828. These agree closely with van Beneden's descrip- 

 tion of this species. 



Table 1. — Measurements of two specimens of Entobdella hippoglossi in glycerin 



and in balsam 



Measurement 



Specimen 1 



Glycerin Balsam 



Specimen 2 



Glycerin Balsam 



Length 



Breadth 



Anterior suckers, length. . 

 Anterior suckers, breadth 

 Posterior sucker, length.. 

 Posterior sucker, breadth. 

 Length of anterior hook.. 

 Length of middle hook... 

 Length of posterior hook . 



Mm. 



17.00 



9.00 



L53 



.56 



4.75 



5.25 



.42 



.84 



.16 



Mm. 



13. 50 



7.00 



.77 



.51 



4.00 



3.50 



.42 



.70 



.16 



Mm. 

 10.00 

 7.00 

 1.20 

 .70 

 4.50 

 4.50 

 .56 



Mm. 



a 50 

 7.50 

 L33 



.63 

 4.50 

 4.50 



.74 

 1.40 



.12 



Subfamily Capsalinae Johnston, 1929 

 Genus TRISTOMA Cuvier, 1817 



TRISTOMA PAPILLOSUM Diesing 



Plate 14, Figuees 170-174 



Tristomum coccineum Cuvier, Linton, Proe. U. S. Nat. Mus., voL 20, pp. 509, 510, 

 pi. 40, fig. 9, 1898 ; Bull. U. S. Fish Comm. for 1899, p. 278, 1900 ; ibid, p. 448, 

 1901 ; Bull. U. S. Bur. Fish., vol. 31, pt. 2, p. 585, 1911. 



Beginning with the season of 1912, Dr. G. A. MacCallum under- 

 took investigations on the monogenetic trematodes of the Woods 

 Hole region, and thereafter such gill and skin parasites as I came 



