THE MYXOSPOKIDIA, OR PSOROSPERMS OF FISHES. 291 



EXPLANATION OF PLATES. 



All figures copied are either of the same size as, or 1^ times the size of, thefigxire* 

 from which they were copied; that is, in copying only 2 ratios were used, 1:1 and 

 f:l. The relative sizes of the copied and the original figures are in every case 

 indicated hy the figures inthin the j)arcntheses. All figures outside the parentheses 

 indicate the total ami)liticatiou i'rom the specimens. For the derivation of any figure, 

 see table, pp. 131-134. 



Plate 1. 



Figs. 1-4. Psorospermia sciamcF-itmirce (after Robin, x |). 

 Irt. Tlie couvoluted string (cm-don enroaU). X 1^. 

 lb. Section of fig. la. X 1^. 



2. Cells of varictv 1. X 600. 



3. Cells of variety 2. X 600. 



4. Operculate cells of variety 3. X 600. 



Plate 2. 



Figs. 1-2. LHhocyslis schneideri (after Cu^not. X |). 



1. Gregarine stage, with volumiuous nucleus and clinorhombic crystals. 



2a. Spore at the extremity of the tube, showiug the truncated distal au... 



rounded proximal extremities, and the sporozoitcs in course of formation. 

 2b. Fully developed spore contaiuiug 8 sporozoites. 

 Fig. 3. Genus incerf. sp. 3 (alter iliiller & Retzius. X |). Spores fi'om the diseaaoa 

 air bladder of Gadiis niorrliiia. 



Plate 3. 



Figs. 1-5. Balbiania riletji (after Stiles. X 1). 



1. A portion of the pectoral muscles of Jnas boschas in the condition known as 



"measly duck." 



2. Longitudinal section of parasite (greatly enlarged). 



3. Transverse section (greatly eularged) : et, connective tissue cyst with numer- 



ous nuclei; cu, cuticle of the parasite; m, sections of muscle. 



4. Microtome section ol meshes containing falciform bodies greatly enlarged. 



5. Falciform bodies: a, stained, showing nucleus and vacuole; b, unstained. 



Plate 4. 



Fig. la-m. Genus incert sp. 4 (after Valentin. X I). 



la. The original globular form. 



Ib-d. Different stages of the unrolling of the tail. 



le. A globule in which the separate dark granules aiipear to be inclosed iu w..»»a- 

 rate peduncles. 



If. Peduncle ideally enlarged. 



lf/-m. Various forms of the deve]f)p('d animal. 

 Figs. 2-8. Genus incert. sp. 6 (after Schewiakotf. X 1). 



2. Amcebiform stage. X 1500. 



3-5. Encvstment. X 1500. 



6. Cyst with 6 spores. X 1500. 



7. Cyst thickly filled with spores. X 1500. 



8. Plasmode proceeding from the fusion of 3 amoeba}, X X500. 



