THE MYXOSPORIDIA, OR PSOROSPERMS OF FISHES. 293 



PiTate 10. 



Figs. 1-3. Ghigea anomdla. 



la-h. (After Gluge. X 1.) 



la, h. Showing Gasterosteus aculeatus with tumors on sides of body and on tail. 

 X 1. 



Ic-e. Spores variously magnified. X 255-840. 



If, g. The same "coagulated." 



lit. Cyst meiiibrane. 



2. Section sliowing, from above downward, subcutaneous connective tissue, cyst 

 memltrane, protoplasmic contents of cyst, and spores (after Tbelohau. X 1). 



3a-i. Group of spores: a, b, fresh; c-i, safranin stained; c, d, spores with 1 

 nucleus; e, f, with 2 nuclei; g, with 3; h, i, with 4 (after Th61ohan. X 1). 

 Figs. 4-5. Thelohania contejeani (after Henueguy and Tliclohan). 



4. Longitudinal section of diseased craytish muscle (X 1). 



5a. Spores in sporophorous vesicle, and free (x f). 



5b. Individual spore, more highly maguilied (X i). 

 Fig. 6. Thelohania octospora (after Henneguy. X 1). 



6«. Sporophorous vesicle with spores, 



6b. Individual spores. 



6c. Longitudinal section of diseased muscle of Palcrmon rectirostris, showing 

 sporophorous vesicles between the separated librillae. 



6d. Portion of c more highly magniiied. ^ 



Plate 11. 



Figs. 1-5. Thelohania ociospora (after Henneguy and Tlu^loban. X 1 except fig. 5). 



1. Transverse section of entire abdomen of a badly diseased Palivmon rectirostris, 



showing, opposite the letters, the following : m, m, affected muscles ; dt, diges- 

 tive tube; n, uerve cord; cl, sections of the cJaws. 



2. Longitudinal section of muscle showing the dissociation of the fibrillai. 

 3: Transverse section of diseased muscle. 



4. A part of fig. 2, more highly magnified, showing fibrillar with very clear stria- 

 trion, and the sporophorous vesicles. 



5a-d. Showing the spores: b, in the fresh state showing the vacuole; a, c, d, 

 after action of ether; a, with the filament partially, c and d with it com- 

 pletely, extruded (X I). 



Plate 12. 



Figs. 1-2. Thelohania giardi (after Henneguy and Thdlohan). 



I. Spore formation (X ?). 

 la. Young pansporoblast. 



1^. Pansporoblast whose nucleus has lost its membrane and presents itself under 



the form of an equatorial plate. 

 Ic. Pansporoblast whose nucleus lias segmented into 2. 

 Id. Pansporoblast the protoplasm of which has segmented into 2 uninucleate 



plasma hemispheres. 

 le. Pansporoblast in the iv stage; fresh state. 

 If. Pansporoblast in the iv stage, the augumeutation of size of nuclei and change 



in disposition of chromatin preliminary to division. 

 Ig. Pansporoblast in the iv stage ; nucleus in repose. 

 lh,i. Pansporoblast in the viii stage; different dispositions of the sporoblasts 



(the 8th in i is not represented, being hidden by the others). 

 Vic. Sporophorous vesicle inclosing 8 ripe spores. 



II. Pansporoblast inclosing 4 normal spores, and 2 bodies each formed by the 



soldering together of 2 spores by their large ends : a, thickening of the pan- 

 sporoblast membrane; b, spores soldered; s, normal spores. 



Im, n. 2 sporoblasts with crescentic nucleus. In the concavity of the latter, a 

 clear vacuole. At n a small protoplasmic button projects into the vacuole. 



lo. Spores in fresh state showing at the large end a clear vacuole and at the small, 

 a brilliant point corresponding to the capsule. 



Ip. Spores showing the vacuole and the longitudinal shell-stria^. 



l^, r. Spores after action of sulphuric acid: g, filament incompletely unrolled; 

 r, filament completely unrolled. 



