326 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



the testes (fig. 12), and thus may be homologous to the lateral 

 excretory tubes. The lateral tubes do not occur in Opechona 

 pharyngodactyla. 



Family ACANTHOCOLPIDAE 



Genus STEPHANOSTOMUM Looss, 1899 



Stephanostonuim Looss, 1899, p. 576. 

 Stephanochasmns Looss, 1900, p. 603. 

 Lechradena Linton, 1910, p. 46. 

 Echinostephanus Yamaguti, 1934, p. 374. 



More than 30 species of Stephanostomum have been named. Of 

 these, three — Stephanochasmns hystrix (Dupardin, 1845, of 

 Olsson) Looss, 1899 ; S. rohustus MacCallum, 1917 ; and Stephanos- 

 tomum sobrinum (Levinsen, 1881) Looss, 1899 — are insufficiently 

 described. Since the genus is a large one and widely distributed 

 among marine fishes, a list of species and a key to aid in their 

 identification is presented. 



For many years species in this genus v^^ere considered in the 

 genus Stephanochasmns, which Looss (1900) named for them 

 because he considered Stephanostomum invalidated by Stephanos- 

 toma Danielsen and Koren, 1880. As Stephanochasmns species 

 were transferred to Stephanostomum, the literature frequently did 

 not clearly indicate the authors of new combinations. Of the 

 species in the following list, Dawes (1946) seems to have first 

 used the combination in one case, while four seem to be new com- 

 binations. Synonyms of only the new combinations are listed 

 here. 



SPECIES OF STEPHANOSTOMUM 



anisoti-emi Manter, 1940 



baccatum (Nicoll, 1907) Manter, 1934 



bicoronatum (Stossich, 1883) Manter, 1940 



caducum (Looss, 1901) Manter, 1934 



calif omicum (p. 328), new species 



casum (Linton, 1910) McFarlane, 1936 



cesticilhmi (Molin, 1858) Looss, 1899 (type species) 



cloacum (Srivastava, 1938), new combination ; synonym Echinostephanus 

 cloacum Srivastava, 1938 



coryphaenae Manter, 1947 



dentatum (Linton, 1900) Manter, 1931 



ditrematis (Yamaguti, 1939) Manter, 1947 



elongatum (Park, 1939) Hanson, 1950 



fistulariae (Yamaguti, 1940) new combination; (synonym Echinosteph- 

 anus fistulariae Yamaguti, 1940) 



hispidum (Yamaguti, 1934) Manter, 1940 



imparispine (Linton, 1905) Manter, 1940 



