190 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 
TRUE MYXOSPORIDIA. 
Ordo I. Cryptocystes Gurley, 1893. 
Etymology: «puyzroc, concealed, xvatic, capsule. 
Bull. U. S. Fish Com. for 1891, x1, p. 409; i6., Braun, 1894, Centralbl. f. 
Bakt. u. Parasitenkde, xv, p. 86. 
Myxosporidia in which the pansporoblast produces many (8 or more) 
spores; the latter minute; without distinct symmetry; with but a single 
capsule; type (and only) family Glugeide. 
Fam. GLUGEID Gurley, 1893. 
( Glugeidées” Thélohan, 1892, Bull. Soc. philomat. Paris, Iv, pp. 173-4; Glu- 
geidea [Thél.] Braun, 1893, Centralbl. f. Bakt. u. Parasitenkde, XIv, p. 
739). 
ee a Bull. U. S. Fish Com, for 1891, x1, p. 409; Glgeidz (error), Braun, 
1894, Centralbl. f. Bakt. u. Parasitenkde, xv, p. 86. 
Definition (provisional as regards negative characters).—Cryptocystes 
destitute of a bivalve shell, with the capsule at the anterior extremity ; 
an aniodinophile vacuole; type genus Glugea. 
This family now includes Glugea, Pleistophora, and Thelohania. Before 
the proposition of Pleistophora, only 2 genera had been proposed. Their 
distinction was practically based upon 3 characters, a comparison of 
which indicated very strongly that either there were too many genera 
or too few. If, as Henneguy and Thélohan and the writer believe, 
these characters are competent to determine generic lines at all (in the 
opposite case cadit questio and everything reduces to Glugea), then the 
spore of Cottus scorpio should form the type of a new genus, for (see 
table below) of the 3 characters but 1 is common to it and Glugea, and, 
although 2 are common to it and Thelohania, the third (divergent) 
character is one of no slight importance in Thelohania, as it iscommon 
to all the 3 (probably 4) typical species. For this genus I have pro- 
posed the name Pleistophora. 
+s Pansporoblast Pansporoblast 
Myxosporidium. producing spores. membrane. Genus. 
SEES Nae = stalaloi<i= == Inconstant, numerous. -..-| Not subpersistent..-.---- Glugea. 
PASS CI b= ome c= = .-| Inconstant, numerous....| Subpersistent -..--.--.--- Pleistophora. 
, i 
ASD Seni se seee <= = 2 | Gonstant, 8'-eecses-eeeamne- Subpersistent ........---- Thelohania. 
; 
| 
) 
; 
