TREMATODES FROM FISHES — LINTON 47 



One, collected August 11, 1908, from tautog; length, 0.91 mm., 

 breadth, 0.42 mm.; diameter of oral sucker 0.14 mm., of pharynx 

 0.03 mm., of ventral sucker 0.22 mm. 



Three, collected August 6, 1910, from tautog; small, brownish 

 yellow, fusiform. Measurements, life: Length, 1.12 nmi. ; breadth, 

 0.54 mm. ; diameter of oral sucker 0.15 mm., of pharynx 0.05 mm., of 

 ventral sucker 0.3 mm. 



One, collected August 10, 1910, from tautog; length, 0.87 mm.; 

 breadth, 0.42 mm. ; uterus voluminous, but without ova. 



Three, collected April 21, 1913, from tautog. Measurements in 

 formalin: Lengths, 1, 0.96, 0.94 mm.; breadths, 0.43, 0.42, 0.42 mm.; 

 diameters of oral suckers, 0.16, 0.14, 0.15 mm., of ventral suckers, 

 0.26, 0.28, 0.26 mm. 



Six (U.S.N.M. No. 8194), collected October 23, 1913, from tautog. 



Dimensions of largest in formalin : Length, 1.8 mm., breadth, 0.51 

 mm.; diameter of oral sucker, 0.18 mm., of ventral sucker, 0.28 nmi. 



An immature distome which appears to belong to this species is 

 here recorded: One, immature, collected July 17, 1908, from round 

 herring. Measurements, life: Length, 0.48 mm.; breadth, 0.26 mm.; 

 diameter of oral sucker, 0.06 mm., of pharynx, 0.04 mm., of ventral 

 sucker, 0.08 mm. Fusiform, broadest at level of ventral sucker, the 

 posterior edge of which is at about the middle of the length. Testes 

 opposite and about on a level with the posterior half of the ventral 

 sucker ; ovary behind testes ; intestines extend nearly to posterior end 

 of body. The excretory vessels contained exceedingly small globular 

 bodies. 



Genus STEGANODERMA Stafford, 1904 



STEGANODERMA FORMOSUM Stafford 



Plate 21, Figures 278-282 



Steganoderma formosum Staffoed, Zool. Anz., vol. 27, pp. 486, 487, 1904. — 

 Manteb, Illinois Biol. Mon., vol. 10, No. 2, pp. 88-90, figs. 58-60, 1926. 



A single distome (U.S.N.M. No. 8195), found by Vinal N. Ed- 

 wards in a four-spotted flounder {Paralichthys ohlongus), June 1, 

 1914, agrees, so far as the anatomy is shown, with Manter's excel- 

 lent description of this species. 



The specimen, mounted in balsam, is oblong-elliptical, rounded at 

 the ends, minutely and densely spinose, spines flat and scalelike ; oral 

 and ventral suckers about equal; pharjmx small and rather indis- 

 tinct; esophagus much longer than pharynx. The intestinal rami 

 begin at a point about 0.28 mm. from the anterior end and 0.24 in 

 front of the ventral sucker. They could be traced as far back as 

 the level of the posterior edge of the ventral sucker, where they were 



