22 PROCEEDINGS OF THE NATIONAL. MUSEUM vou 88 



Measurements in balsam : Length, 2.8 mm. ; maximum breadth, 0.5 

 mm.; length of sucker-bearing portion, 1.3 mm.; anterior suckers, 

 length, 0.07 mm., breadth, 0.033 mm.; pharynx, length, 0.075 mm., 

 breadth, 0.048 mm.; diameter of circle of hooks at genital pore, 0.1 

 mm,; length of hooks, about 0.04 mm.; diameter of cluster of cirrus 

 hooks, 0,05 mm.; length of hooks, 0.036 mm,; length of a posterior 

 sucker about 0.06 mm., breadth about 0.08 mm,; length of ovum, ex- 

 clusive of filaments, 0.24 mm., diameter, 0.07 mm. The number 

 of posterior suckers was about 50 on each side. 



MICROCOTYLE species 

 Plate 17, Figxjkes 224-227 



Two specimens from the gills of the squeteague (Oynoscion regalis) 

 are here noted. The species differs from M. longicauda Goto, from 

 the same host, in the number of caudal suckers, the number of testes, 

 and in the character of the genital atrium. 



The collection consists of a single mounted specimen. 



Record, of collections. — One, collected August 9, 1903. It was acci- 

 dentally crushed while it was under examination. Hooks of the gen- 

 ital atrium of three kinds. Plate 17, figure 226, was sketched from 

 the crushed specimen. Ova fusiform, with filament at one end. 



One (U.S.N.M, No, 8166), collected August 22, 1914, This speci- 

 men, slightly damaged, is mounted in balsam. The number of testes 

 is about 20, The ovary is lobed. The portion containing ripe germ 

 cells forms a horseshoe-shaped loop with the open end toward the 

 posterior end. The vitellaria extend into the sucker-bearing portion. 



Measurements in balsam: Length, 4.5 mm.; breadth, at level of 

 anterior suckers, 0.2 mm., at level of ovary 0.9 mm. ; length of sucker- 

 bearing portion about 2.3 mm,; anterior sucker, length, 0,09 mm., 

 breadth, 0.06 mm.; pharynx, length, 0.08 mm., breadth, 0,05 nmi, ; 

 posterior suckers, 0.07 by 0.05 mm. ; about 70 suckers on each side. 



Genus AXINE Abilgaard, 1794 



AXINE GRACILIS, new species 

 Plate 17, Figuees 22S-230 



The collection contains three specimens, mounted in balsam: two 

 adults, one of which lacks the greater part of the region back of the 

 ovary, and one young specimen. 



These worms are slender and of nearly uniform breadth through- 

 out the greater part of the length, tapering slightly near the anterior 



