132 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.88 



STERRHURUS species 



Here is recorded a single distome from Histrio pictus^ on which the 

 following note was made at the time of collecting, August 9, 1904. 



Body smooth, with a few irregular transverse wrinkles; genital 

 aperture at posterior edge of oral sucker; cirrus, cirrus pouch and 

 prostate indistinct; testes transverse at posterior edge of ventral 

 sucker; ovary subglobular, on left side; vitellaria behind ovary, the 

 left one slightly lobed, its anterior border reaching nearly to the 

 middle of the ovary. The rami of the intestine extend to the 

 appendix, but were not seen to enter it. 



Measurements in glycerin : Length, 1.23 mm. ; breadth, anterior, 

 0.15 mm., middle, 0.45 mm., posterior, 0.15 mm.; diameter of oral 

 sucker, 0.15 mm., of ventral sucker, 0.28 mm. 



Subfamily Leicithasternae Odhner, 1905 



Genus LECITHASTER Luhe, 1901 



LECITHASTER CONFUSUS Odhner 

 Plate 11, Figtjkes 121-124 



Distomum hothryoplioron Olsson, Linton, Bull. U. S. Fish Comm. for 1899, p. 



439, figs. 355, 356, 1901. 

 Lecithaster confu^us Odhneb, Die Trematoden des arktischen Gebietes, Fauna 



Arctica, vol. 4, p. 359, 1905; Zool. Jahrb., vol. 26, p. 164, figs. 70-72, 1907.— 



LiJHE, ill Brauer's Siisswassei'fauna Deuslchlands, vol. 17, Trematodes, 



pp. 140, 141, 1909. 



Examples of small distomes have been found in a number of Woods 

 Hole fishes which agree closely with forms that appear in the litera- 

 ture of the Trematoda under a variety of specific names, but which 

 are included by Odhner and Liihe in the two species Lecithaster gib- 

 hosus (Rudolphi) and L. confusus Odhner. 



Unfortunately many of the specimens in the collection show the 

 anatomy imperfectly. 



According to Liihe, following Odhner, the two species may be 

 briefly characterized thus: 



L. gibhosus: Lobes of ovary roundish, scarcely longer than broad; 

 lobes of vitellaria slender, tending to pyriform; seminal vesicle dorsal 

 to, and not extending beyond the ventral sucker ; ova, 0.025 to 0.027 

 by 0.013 mm. 



L. confusus: Lobes of ovary longish; lobes of vitellaria short, 

 scarcely as long as broad ; seminal vesicle extending back of ventral 

 sucker; ova, 0.015 to 0.017 by 0.009 mm. 



In those cases in which the seminal vesicle, ovary, and vitellaria are 

 indistinct I have referred those with ova approximating 0.025 by 

 0.013 mm. to L. gibhosus, and those whose ova approximate 0.015 by 

 0.009 mm. to L. confusus. 



