CERATOMYXA ACADIENSIS. 



567 



on either side are very long and thin. Their exact 

 length in the spore of the parasite from Urophycis 

 chuss was not measured. Their extreme fineness 

 and great length make this very difficult, except in 

 very favorable preparations. They were measured 

 in the case of the parasite of Zoarces angularis 

 (Fig. B), where they were found to be 300 ju in 

 length, and in the case of the parasite of P. ameri- 

 canus, where they measured about 250 /z in length, 

 or from five to six times the width of the spore, 

 exclusive of the filaments. In Plate III, Figure 51, 

 is shown a myxosporidium in which two spores 

 have developed side by side in the relative positions 

 described in a previous section. The protoplasm 

 of the myxosporidium extends out along the lateral 

 filaments of the spores. The lateral filaments were 

 not seen at any time wound around the developing 

 spores as described by Doflein ('98) for the spores 

 of Ceratomyxa linospora. The cavity of the valves 

 does not appear to be continued into the filaments. 

 The length of these filaments is greater, both rela- 

 tively to the width of the spore exclusive of them, 

 and absolutely, than the length recorded for the lat- 

 eral filaments of any other species of Ceratomyxa. 

 The longest lateral filaments hitherto described are 

 those of C. linospora Doflein, which are 20 ^t in 

 length, or twice the width of the spore excluding 

 filaments. In their length these lateral filaments 

 may be compared with the long posterior filaments 

 found by Nemeczek (:11) attached to the spores of 

 Henneguya gigantea Nemeczek, which attain a 

 length of 77-100 /x, or about nine times the length 

 of the spore. Long filaments are most common in 

 the two genera Ceratomyxa and Henneguya. 



It is generally believed that the filamentous 

 appendages of myxosporidian spores aid the 



Figure B. Ceratomyxa acadiensis, n. sp., spores 

 drawn with the Abbe camera lucida from fresh prepara- 

 tions; a., from the gall bladder of Zoarces angularis 

 showing lateral filaments, lower filament full length, 

 upper one cut off; h., from the gall bladder of TToph>cis 

 chuss showing polar filaments extruded. X 270 diameters. 



