190 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 



TRUE MYXOSPORIDIA. 



Ordo I. Cryptocystes Gurley, 1893. 



Etymology: Kpv-ror, concealed, Kvanc, capsule. 



Bull. U. S. Fish Com. for 1891, xi, p. 409; ib., Braun, 1894, Centralbl. f. 

 Bakt. u. Parasiteukde, xv, p. 86. 



Myxosporidia in Avhicli the pansporoblast produces many (8 or more) 

 spores; the latter minute; without distinct symmetry; with but a single 

 capsule; type (and only) i'amily Giugcidce. 



Fam. GLUGEID.li: Gurley, 1893. 



("Glugeiddes" TIk'IoIkui, 1892, Bull. Soc. philoiiiat. Paris, IV, pp. 173-4; Glu- 

 geidea [TlioL] Brauu, 1893, Ceutralbl. f. Bakt. n. Parasiteukde, xiv, p. 

 739). 



Glufjeidce, Bull. U. S. Fish Com. for 1891, xi, p. 409; Glgeidae (error), Brauu, 

 1894, Centralbl. f. Bakt. u. Parasiteukde, xv, p. 86. 



Definition (provisional as regards negative characters). — Cryptocystes 

 destitute of a bivalve shell, with the capsule at the anterior extremity; 

 an aniodiuophile vacuole; type genus Glugea. 



This family now includes Glugea, Pleistophora, and Thelolmnia. Before 

 the proposition of Plcistophora, 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 Tlielohan and the writer believe, 

 these characters are competent to determine generic lines at all (in the 

 opposite case cadit qmmtio 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 is common 

 to all the 3 (probably 4) typical species. For this genus I have pro- 

 posed the name Pleistophora. 



