TKEMATODES FROM FISHES — ^LINTON 21 



which it emerges as the uterus to pass along the median line ventral 

 to the vas deferens to the genital atrium. Testes from 14 to 24. 

 In the seven specimens mounted in balsam one has 14 testes, four 

 have 15 each, one 16, and one about 24. They extend from the poste- 

 rior edge of the ovary to a point a little in front of the posterior end 

 of the vitellaria. The vitellaria begin a short distance back of the 

 level of the genital atrium and continue in a broad band on each 

 lateral margin to unite behind the testes. A few follicles continue 

 into the sucker-bearing portion. Y-shaped yolk ducts are a conspic- 

 uous feature in most cases. In some of them these ducts expand 

 into capacious yolk reservoirs. They originate, one on each side a 

 little in front of the middle, and unite in a common duct on the 

 median line a short distance in front of the ovary proper. 



Measurements in balsam: Length of body proper 2.1 nam., of 

 sucker-bearing portion 1.7 mm., breadth at level of anterior suckers 

 0.14 mm., at level of genital atrium 0.35 mm., at level of ovary 0.81 

 mm. ; anterior sucker, length 0.045 mm., breadth 0.06 mm. ; pharynx, 

 length 0.045 mm., breadth 0.039 mm. (in another specimen length, 

 0.045 mm., breadth, 0.045 mm.) ; posterior sucker, 0.075 by 0.045 mm. 

 Smallest number of suckers counted on one side 20, largest number 

 noted 28; one was noted that had 28 suckers on one side and 24 on 

 the other. 



Type specimen. — Holotype, U.S.N.M. No. 8164. 



Host. — Tautog {Tautoga onitis). 



Record of collections. — One, collected August 15, 1908, from gills 

 of host ; length, 3 mm., breadth, 0.5 mm. ; 42 suckers on sucker-bearing 

 portion. 



Many, collected July 9, 1910, from gills; color white, except in 

 vicinity of vitellaria. In some cases the intestine was red by reflected, 

 yellowish by transmitted, light. Length, 4 mm., more or less. 



Three, collected August 3, 1910, on gills. 



Few, collected August 10, 1910, on gills. 



One (U.S.N.M. No. 8164), collected by Vinal N. Edwards, May 4, 

 1914, from gills ; length, 4.25 mm. 



MICROCOTYLE SPINICIRRUS MacCallnm 



Microcotyle spmicirrus MacCaixxjm, Zoopathologica, vol. 1, No. 3, p. 95, fig. 50, 

 1918. 



Host. — Fresh- water drum {Aplodinotus grv/nniens). 



Record of collection. — A small number of these trematodes 

 (U.S.N.M. No. 8165), collected by T. Serbes, Fairport, Iowa, and sent 

 to me by Dr. R. E. Coker, were received on July 23, 1913. They 

 agree in general with Dr. MacCallum's description of the species. 



