120 REPORT OF THE COMMISSIONER OF FISTT AND FISHERIES. 



FilaintMit extrnsiou: Most certainly produced in llie fresh state by 

 strong" sulphuric acid, iodine water, glycerin, nitric, hydrochloric, 

 acetic, formic acids, alkaline hydrates, boiling water, ether, etc., es])e- 

 cially the lirst two. In alcoholic specimens, also, occasional sjioics 

 extrude their lilaments under the action of sulphuric acid or iodine. 



VIII.— DEFINITIONS. 



Anterior (and i^osterior): There can be no question that the longitudi- 

 nal diameter is the anteroposterior axis of the body* The discrimina- 

 tion of anterior from posterior is, however, in theabsenceof cephalization, 

 impossible. I have followed custom in calling the sharper, capsular end 

 "anterior," and the o])p!)site ronndcMl end " posterior.'' 



Capsules: The pyriform, hollow, lilament-containing bodies charac- 

 teristic of the myxosporidian spore ("twinned \-esicles" of Balbiani; 

 "polar capsules" of Biitschli). "0ai)sule" is preferred to "vesicle" on 

 account of greater detiniteness, and to "i)olar capsule," as the situation 

 implied by the latter is not constant. 



Cornua: The pointed anteriorly projecting extremities of the sporo- 

 plasm. They are infero-, and superolateral, and infero-, and supero- 

 median. (See also Surface, superior, p. 122.) 



Diameter, longitudinal: The line formed by the intersection of the 

 longitudiiml and vertical planes. 



Diameter, transverse: The line formed by the intersection of the 

 transverse and longitudinal planes. 



Diameter, vertical: The line formed by the intersection of the verti- 

 cal and tranvsverse planes. 



Ducts: The ducts into which the ca])sule is drawn out anteriorly and 

 which serve for the exit of the filaments. 



Ends (of the sp(n'e): The median (anterior and posterior) extremities 

 in contradistinction to the wings. 



Filaments: The filaments which lie coiled within the capsules. The 

 "capsular filaments," "spiral filaments," and "coiled lilaments" of the 

 authors. Notto be confounded with theriljbonettes. 



Host: In the usual sense; see also Seat. 



Myxoplasm: The X)r()to])lasni of the my xos])()ridium. 



Myxosporidium: The am(eb()id adult stage; Muitrrblase, Leydig. 



Pansporoblast: see Sporohlast. 



Pericystic space: The si)ace apparently empty (presumably fluid- 

 filled) surrounding the capsules. 



Plane, longitudinal: ^ Horizontal ami i)ercapsular, passing through 

 l)oth capsules and the sporoplasm, ami dividing the si)ore into a supe- 

 rior and an inferior portion. 



'For brevity .aud clearness these planes are dolined as if rectanjjiilarly arran<fed 

 abont tbe center of the Mjxobolun spore, the latter being supposed to bo viewed " on 

 the Hat." 



