276 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 



as the anterior), rouuded; the other (posterior) usually attenuated, 

 pointed, sometimes, however, swollen, rounded or bifurcate, or 7-, or 

 8- (or more) lobed. Limit between ectoplasm and eudopiasm almost 

 indistin<;uishable; myxoplasm finely granular, presenting constantly, 

 near the anterior end, grouped in variable number, some small, very 

 refringent, fatty globules. 



Pseudopodia diii'ering markedly from those of other 3fi/xosporidia, 

 always limited to anterior end; number variable up to 7 or 8, perfectly 

 distinct from one another, almost filiform, progressively attenuating 

 to their drawn-out pointed extremities; length very considerable, ad 

 max. one half that of the myxosporidium ; composed of exceedingly fine 

 granular plasma resembling the ectoplasm of other Myxosporidia^ 

 whence their ectoplasmic nature may be inferred. 



Movements of i)seudopodia very rapid, describing a semicircle, 

 always from before backward. Thelohan could not determine whether, 

 upon arriving at their limit of backward motion, the pseudopodia fuse 

 with the myxosporidium or move forward to repeat their sweep. Loco- 

 motion of myxosporidium thus produced, relatively rapid (3 times its 

 length in 25 seconds). Remainder of myxosporidium motionless, appar- 

 ently, however, possessing a certain contractility, as is seen when the 

 anterior (pseudopodia!) end becomes lodged against an obstacle. 



Spore. — Similar to that of Ceratomyxa splicemlosa; breadth 60 //. 

 Never more than 2 spores in one myxosporidium. 



Habitat. — Free in the gall-bladder of Basyatis pastinica L. ( = Trygon 



vulgaris) sting-ray at Coucarneau in September, 1892. 



86. Ceratomyxa appendiculata Thelohan, 1892. 



Compt. Rend. Acad. Sci. Paris, cxv, pp. 963-964. 



Cyst none. 



Myxosporidium. — Presenting special characters which clearly dis- 

 tinguish this species. Fully developed forms assume very irregular and 

 very variable shapes; renuirkable for the i^resence of 1 to 4 or 5 immov- 

 able prolongations, composed of an endoplasmic axis and an ectoplasmic 

 covering, which extend out from a central portion of a very variable 

 form. Length of prolongations may reach twice the diameter of the 

 central portion. Pseudopodia lobed, originating from the ectoplasm of 

 the central mass at no fixed point, which is changeable from moment 

 to moment. 



Spore-formation. — Taking place in the above-mentioned central por- 

 tion, each myxosporidium producing 2 spores. 



^j,ore.— Length (?), 5 to 8 //; breadth (?), 65 }x. 



Habitat. — Free in the gall-bladder of Lophius piscatorius (angler) 

 collected at Koscoff and at Le Croisic in August and September, 1892. 



