14 PKOCEEDINGS OF THE NATIONAL. MUSEUM vol.88 



striction, which marks off the anterior portion from the body proper. 

 The esophagus is short. The intestinal rami appear to continue to 

 near the posterior end of the sucker-bearing portion. The genital 

 atrium is close behind the forking of the intestine, and appears to 

 lie a little to one side of the median line. It is surrounded by strong 

 muscles, but no hooks were seen either in whole mounts or in sec- 

 tions. The breadth of the muscular atrium in cross sections is 0.15 

 rmn., its vertical diameter, 0.08 mm. The ovary, with its spacious 

 portion containing large nucleated germ cells, lies a short distance 

 behind the genital atrium. The shell gland is dorsally placed. The 

 vitellaria begin at the level of the posterior end of the pharynx and 

 extend to the posterior end of the body proper. The testes are 

 numerous and fill a wide median space between the ovary and a 

 point near the posterior end of the body. The sucker-bearing por- 

 tion bears eight relatively large, pedicelled suckers, arranged sym- 

 metrically, four on each side. The suckers are supported by a chi- 

 tinous frame work which forms a cross, characteristic of the genus 

 Diclidophora. 



Type specimens. — Holotype, U.S.N.M. No. 8157; paratypes, No. 

 8158. 



Family DISCOCOTYLIDAE Price, 1936 

 Genus ANTHOCOTYLE van Beneden and Hesse, 1863 



ANTHOCOTYLE MERLUCCII AMERICANUS MacCallnm 



Plate 16, Figxibes 200, 201 



Anthocotyle merluccii americanus MacCallum, Zoopathologica, vol. 1, pp. 25-27, 

 figs. 10, lOA, 1916. 



I find one specimen of this species in my collection, from gills of 

 the whiting {Merluccius hilinearis), collected July 2, 1924. Length, 

 life, 8 mm. (U.S.N.M. No. 8191). 



Measurements in balsam : Length, 7.5 mm. ; maximum breadth, at 

 level of ovary, 1.26 mm. ; diameter anterior suckers, 0.07 mm. ; phar- 

 ynx, length 0.08 mm., breadth 0.07 mm.; larger posterior suckers, 

 left, length 0.52 mm., breadth 0.63 mm.; right, length 0.45 mm., 

 breadth 0.52 mm. ; smaller posterior suckers, length 0.06' mm., breadth 

 0.08 mm. ; length of terminal spines 0.06 mm. 



Some points of difference between this specimen and those studied 

 by Dr. MacCallum were noted. Thus, the left of the larger posterior 

 suckers are the larger instead of the right. The terminal booklets 

 are not of uniform size and shape. There are also paired vaginae 

 (pi. 16, fig. 200). 



