410 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
PLEISTOPHORA * gen. nov. 
Definition (provisional as regards negative characters) : Glugeidae destitute of a 
myxosporidium and in which the pansporoblast produces an inconstant but large 
number (always more than 8) of spores ; pansporoblast membrane, subpersistent (as a 
polysporophorous vesicle) ; type (and only) species, P. typicalis sp. nov. 
Fleistophora typicalis sp. nov. 
(Corpuscles of Cottus scorpio Thelohan, 1890, Anna!, de Microgr. Paris, ii, pp. 203, 212; ib. Th61o- 
lian, 1891, Compt. Rend, hebdom. Soc. Biol. Paris, in, pp. 27-8; ib. Henneguy and ThMohan, 
1892, Annal. de Microgr., iv, pp. 618-619, 622, 631, 636.) 
Pansporoblast: Spherical, diameter 15 to 18 pi. 
Spore: Ovoid; length 3 pi-, breadth 1.5 to 2.0 pr, chromatophile granules adplur. 4. 
Habitat: Interior of fibrilke of muscles of Cottus scorpio; diseased mass forming 
white streaks 5 to 6 by 3 mm. ; not leading to muscle degeneration. 
THELOHANIA Henneguy, 1892. 
In Th61ohan, Bull. Soc. philomat. Paris, iv, p. 174 (footnote); ib. Henneguy and Th61ohan, 
1892, Annal. de Microgr., iv, p. 639. 
Definition (provisional as regards negative characters) : Glugeidae destitute of a 
myxosporidium and in which the pansporoblast produces constantly 8 spores; pan- 
sporoblast membrane subpersistent (as an octosporophorous vesicle) ; type, T. giardi 
Henneguy.! 
Thelohania contejeani Henneguy, 1892. 
In Thdlolian, Bull. Soc. philomat. Paris, iv, p. 174 (footnote). 
Thelohania octospora Henneguy, 1892. 
In Thelolian, Bull. Soc. philomat. Paris, iv, p. 174 (footnote). 
Thelohania giardi Henneguy, 1892. 
In Thelohan, Bull. Soc. philomat. Paris, iv, p. 174 (footnote). 
Thelohania macrocystis sp. nov. 
(Sarcosporidian of Palcemonetes varians Garbini, 1891, Atti Reale Accad. Lincei Roma, vii, 
Sem. 1, pp. 151-152, with figs.; myxosporidian of ibid. Th61ohan and Henneguy, 1892, 
Compt. Rend, hebdom. Soc. Biol. Paris, iv, p. 586). 
Sporophorous vesicle (subpersistent pansporoblast) elongate-fusiform. 
Habitat: Muscles of Palcemonetes varians from the Mincio, near Yerona. 
II. PHiENOCYSTES ord. nov. 
It is in the classification of this order that the criteria furnished by Tlndohau most 
need to be supplemented by considerations drawn from the symmetry of the spore. 
Considering the taxonomic importance of symmetry throughout the animal kingdom, 
it is strange that no attention has yet been paid to it in the Myxosporidia. But a 
little study of it shows that, whereas in all fusiform spores the pointed extremities 
have heretofore been loosely lumped together as “ends,” those of Myxidium lieber- 
kiihnii Biitschli are not ends ( sens strict. ; = anterior and posterior), but sides; for the 
* Etymology: 7rAe«urof, very many ; (pepeiv, to carry, 
tl propose T. giardi Henneguy as the type of the genus. 
