292 EEPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 



Plate 5. 



Figs. 1-11. Genus incert. ap. 6 (after Schewiakoff. X 1). 

 1-3. Developmeutal stages of the plasmode. X 1500. 



4. Encystment. X 1500. 



5. Cyst-tube with spores. X 1500. 



6. A ruptured cyst with emerging spores. X 1500. 



7. Spores sessile on the muscles. X 1500. 



8. Individual spore. X 2600. 



9. Small plasmatic corpuscles proceeding from the spores. X 2600. 



lOa-l. Transverse division of the spore; the nucleus dividing karyokinetically. 



X 2600. 

 lla-5. Conjectural conjugation stages of the spores. X 2600. 



Plate 6. 



Fig. 1. GewMsincert 8^.9 (after Lieherkiihn in Biitschli. X |). X about 195. 



Myxosporidium from the gall bladder of Lota lota. 

 Fig. 2. Genus incert. sp. 10 (after Lieberkiihn in Biitschli. X I). X about 195. 



Myxosporidium from branchiae oi Lota lota with a very thick ectoplasm. 

 Figs. 3-8. Genus incert. {"Myxosporidium") congri (after Perugia. X 1). 

 3-4. Two forms with " vacuoles." 

 6. An individual attached to a vegetable filament. 



Plate 7. 



Figs. 1-3. Genus incert. sp. 12 (after Linton. X 1). 



1. Notropis megalops with dermal cysts caused by "psorosperms." X 1^. 



2. Spores from cysts, highly magnified. 



2a. Vertical view of spores in caustic potash. 

 2a'. Same, more highly magnified. 

 2b. Transverse view of spore. 

 2b'. Same, more highly magnified. 

 2c. Spore treated with sulphuric acid. 



3. Portion of thin section of cyst: a, pigment spot; i, granular protoplasm; 



c, spores ; d, wall of cyst and dermis. X about 150. 

 Fig. 4. Genus incert. sp. 13 (after Lieberkiilm. X |). 



4a. Spores from a subcutaneous cyst of Gasterosteus aculeatus. X 870. 

 46-e. The same in difi"ereut stages of development; &, spore with plain "nucleus" 

 of usual size; c, d. with smaller "nucleus;" e, "nucleus" scarcely per- 

 ceptible, the previously plain membrane no longer visible, animal 

 mature. 

 Fig. 5. Sarcosporidian spore of sheep with a " cajjsule" (after Pfeilfer. x 1). 



Plate 8. 



Figs. 1-4. Genus incert. ( "Myxosporidium" ) bryozoides (after Korotneff. X 1). 



1. Fi nicle of Alcyonella fungosa, with the spermatozooids and the parasite on 



them. X 3.50. 



2. A parasite inclosed in an Alcyonella zooid. X 350. 



3. 4. Creeping adults with nuclei and spores. X 750. 



Plate 9. 



Figs. 1-4. Genus incert. {"Myxosporidium") bryozoides (after Korotneff. X 1). 



la. Group of spermatoblasts, 2 of them containing very young stages of the 



parasite. X 900. 

 Ih-d. Difterent stages in the conversion of a spermatoblast into a plasmode; 



cell nuclei and parasite nuclei shown. X 900. 

 le. Plasmode in which 1 daughter, and 2 granddaughter cell nuclei are visible. 



Nuclei of parasite numerous. X 900. 



2. A plasmode in which the cell nuclei are atrophying and possess a jagged con- 



tour. X 900. 



3. Spores in which A^acuoles and urticant organs are to be distinguished. X 900. 



4. Nuclei of the i)ara8ite of plate 8, fig. 3. 



