STUDIES OX THE ECTOrARASITIC TREMATODES OF JAPAX. 937 



conspicuous, egg-shaped, hollow, with a thick wall, and communicat- 

 ing with the penis hy means of a short, slender duct. 



Habitat — Gill of Antliias SchleijcUi (Jap. Akasngi). 



Loca lit II — M isak i . 



Drt^^— August 1891. 



X. Tkisto:mu.m, Cuvier. 



This genns was created by Cuvier'^ in 1817 for a worm fouucT on the gill of 

 various species of fish and named by him T. coccinciim, a species which was afterwards 

 examined and described more minutely by T a s c h e n b e r g . Previous to C u v i e r ' s 

 erection of the genus, however, a worm of the same genus had been described (1786) 

 by La Marti nier e-\ the T, maculatinn of Eudolphi. In 183G a second species 

 was described by Diesing and was named by him T. jxijiUIuskih, a species which 

 was afterwards made the object of a more minute study by Küllicker'^ and 

 Taschenberg 0; in 18-47 two now species (2'. squall a.nà T. inolae) were described 

 by Blanchard'''^; in 1878 T. pehDinjdls was described by Taschenberg*^^ and 

 was afterwards redescribed somewhat more at length by Par ona and Pcrugia""', 

 and more cleiirly distinguished from the other species; in 1889 a seventh species, 



1). Cuvier — Règne animal, 1817, t. IV, p. i2. From the quotation in Braun's "Würmer" 

 (p. 528) it appears that Cuvier at first mistook the anterior end for the posterior, but in 

 a later edition the mistake is corrected (c/. Règne animal, t. Ill, Paris, 1830. p. 265). 



2). Martiuiere— Jouru. d. pliysique, 1787, p. 207. Also in " Voyage de Lapérouse," 1798, 

 t. IV, p. 79. Cited on the combined authority of Dujardin, Diesing, and St.-Remy. 



3). Kollicker — Ueber Tristomum papillosum Dies. Berichte von d. ki nigl. zoot. Anstalt 

 z. Wiirzburg, II. Ber. f. d. Schuljahr 1817/48. 1849. pp. 21-27. Cited on Br.iun's authority. 

 4). Taschenberg — Beiträge z. Kenntniss mar. ectopar. Trcuiatxlen, 1879. 



5). Blanchard — Recherches sur l'organisation des vers. Annales d. sciences natur., 3. ser., 

 VIII, 1847. Cited on the combined authority of Braun and St.-Remy. 



G). Taschenberg— Helmiuthologisches. Zeitsch. f. d. gesamm. Xaturwiss., 1878. p. 5G2-577 

 Cited on the combined authority of Braun and St.-Remy. 



7). Parona e Perugia — Di alcuni trematodi cctoparassiti di pesci adriatici. Op. cit., 

 ser. 2, vol. IX, 1890. Estratto p. 3-5. 



