68 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 
(c) Describe important and constant structures before unimportant 
and inconstant ones. 
(d) Describe structure before function. 
The principal exception is the change of place of the cyst, which for 
convenience is placed before the myxosporidium. Properly (were 
arrangement an end rather than a means) it should follow the myxo- 
sporidium. But the cyst occupies quite a subordinate (almost, so to 
speak, an accidental) position in the life cycle, and it sheds little light 
upon any of the structures either of the adult or of the spore. Further, 
to place it between the myxosporidium and the spore would make an 
awkward break in the continuity of the life-history. 
The following is the order adopted, based upon the principles given: 
I. Synonymy: VE: See 
a. Recognized binomial name, au- . General description (form, size, 
thority, date. : * tailed or not, etc.). 
b. Synonymy prior to recognized b. Shell: 
name, in parenthesis. (1) Physico-optico-chemical 
ce. Reference to proposition of recog- characters. 
nized name, followed by sub- (2) Valves, position and separa- 
sequent synonymy. bility. 
II. Cyst: ce. Tail. 
a. Formation. d. Capsules: 
b. Structure. (1) Number, position, etc. 
(1) Macroscopic (form, size, color, (2) Filaments. 
etc.). e. Sporoplasm : 
(2) Microscopie (a) structure and (1) Form. 
origin of membrane and (b) (2) Nuclei. 
contents. (3) Vacnole. 
(4) “Granules” and ‘‘ globules.” 
III. Myxosporidium: VI. Exit of sporoplasm, and “completion 
a. General characters (form, size, of life cycle with earlier stages of 
color, etc.). development of myxosporidium. 
b. Ectoplasm. VII. Habitat; seat, season, frequency. 
c. Endoplasm: Vil Pathological anatomy : 
(1) General description. a. Morbid structures (in order of 
(2) Nuclei. formation): 
(3) Granules” and ‘ globules.” (1) Cell infection. 
(4) Vacuoles. (2) Tumors. 
(5) Inclusions, notably pigment. (3) Ulcers (later stage of tumors). 
d. Pseudopodia. IX. Effects and symptoms. 
e. Amceboid movements. X. Epidemics: 
a. Fishes affected; territory cov- 
IV. Spore formation: ered; extent of ravages. 
a. Formation and segmentation of b. Causes, 
pansporoblast. (1) Predisposing or contributory: 
b. Development of sporoblast into (a) Age, etc. 
spore (in same order as descrip- (b) Pollution of streams. 
tion of spore, below). (2) Exciting: Mode of infection. 
Further, were it not for the abundant evidence to the contrary, fur- 
nished by the literature, it would seem superfluous to urge that every 
report should contain, at least, the following data: 
Host.—The place and date of collection, the water-temperature, the 
scientific name! of the host, together with the age (or size) of the latter, 
1 Upon this last point too much stress can not be laid. The habit of recording the 
host merely by the popular name (often local, always more or less ambiguous, and 
not infrequently designating a whole genus) is greatly to be deprecated, as identi- 
fication is rendered difficult or impossible, especially for students of other times and 
countries, 
