186 REPORT OF THE COMMISSIONER OF FISTI AND FISHERIES. 



16. Genus et sp. incert. 



l'sor().s])(M'iiis ol" (robius JliiriatiUs, IjC.ydi^, 1851, Miiller's Arcliiv., p. 223, iiamo 

 only; ib. of Goh'io [error] JlurlatiUs Ludwif?, 1888, Jahresber. d. rheiu. 

 Fisch-Yerciiis, 1888, ]). 30. 



Hnhiiai. — l>0(ly cjivity of Gohim fluriatilis L.' (goby). 



17. Genus et sp, incert. 



Psor().s|ierm of crocodile, Solgor, 1877, Jahi'e.sber. sclilea. Gesellscli. f. Vatcrl. 

 Cnltiir, i.iv, p. 45. 



Name only, witli stateinei)t that it will be fully described elsewhere. 

 Habitat. — In mucosa and musciilaris of intestinal canal of "croco- 

 dile." 



18. Genus et sp. incert. 



I'sorosperm oi' Cltondrosioma nasus, Leydig, Miiller's Arcbiv., 1851, p. 222. 



No description or figure. 



Habitat. — Cysts in roots of tongue of Chondrostoma nasus L. 



19. Genus et sp. incert. 



Psorospenns of Lendscna riitihis, Leydig, Miiller's Arcliiv., 1851, pp. 222-3. 



Xo description or figure. 



Habitat. — White clumps of "psorosperms" in the heart (auriculo- 

 ventricular valve) of Leuciscus rutilus; also in heart blood of same fish. 



20. Geniis et sp. incert. 



Psorospenns of Cjjprhiiisiiiica, Lioberkiibn, 1854, Bull. Acixd. Roy. Belg., xxi, 

 pt. 2, p. 22. 



No description. 



Habitat. — Scales of Tinea tinea L. (tench). 



21. Genus et sp. incert. 



Psorospernis of CjiprbiKS criilhrophlhahnns, Lieberkiibn, 1854, Bull. Acad. Roy. 

 Belg., XXI, pt, 2, p. 22. 



Mention of occurrence only; no description. 



Habitat. — Subs(piainous, b\\ Leuciscus {IScardinius) erythrophthalmus. 



22. Genus et sp. incert. 



Psorosperms of GaMcrosteus acnleatus, Henseii,'- in Wittraack, 1875, Beitriige 

 z. Fiscberei-Statistik d. deutscb. Reichs, p. 190. 



Mention only; no description. 



Habitat. — On (Jasterostcus acnleatus L. (stickleback) near Kiel. 



23. Genus et sp. incert. 



I'sorosponns of Lucioperca satidra, Hockel &. Kner, 1858, Die Siisswasserfiscbe 

 der (Kstreicbische Monarcbie, Leipzig, p. 12; ib. Wittmack, 1875, Beitriige 

 z. Fiscberei-Statistik d. deutscb. Reicbs, p. 190. 



Heck el and Kner say: 



Tbeir gills arr, often beset witli small cysts lillcd witb a gelatinous fluid (tbe so- 

 called psorosperms) and in tbis condition tbey are regarded as unfit for food. 



'Tbe great similarity of name between tbe present fisb and Gobio JfHviaiUls, and 

 tbe i)reaence of a species upon tbe bitter in tbe same situation (body cavity, see p. 

 243) suggests tbe possibility of an ortbogranbic error. 



2 In response to aii in(|niry,Dr. Wittmack kindly informed me Ibat Prof. Heuseu's 

 observation is uiipublisbed, btiving been made upon a statistical question sbeet. 



