276 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 
as the anterior), rounded; the other (posterior) usually attenuated, 
pointed, sometimes, however, swollen, rounded or bifurcate, or 7-, or 
8- (or more) lobed. Limit between ectoplasm and endoplasm almost 
indistinguishable; myxoplasm finely granular, presenting constantly, 
near the anterior end, grouped in variable number, some small, very 
refringent, fatty globules. 
Pseudopodia differing markedly from those of other Myxosporidia, 
always limited to anterior end; number variable up to 7 or 8, perfectly 
distinet from one another, almost filiform, progressively attenuating 
to their drawn-out pointed extremities; length very considerable, ad 
maw. 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 pseudopodia very rapid, describing a semicircle, 
always from before backward. Thélohan 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 (pseudopodial) end becomes lodged against an obstacle. 
Spore.—Similar to that of Ceratomyxa spherulosa; breadth 60 yu. 
Never more than 2 spores in one myxosporidium. 
Habitat.—Free in the gall-bladder of Dasyatis pastinica L. (= Trygon 
vulgaris) sting-ray at Concarneau in September, 1892, 
86. Ceratomyxa appendiculata Thélohan, 1892. 
Compt. Rend. Acad. Sci. Paris, cxv, pp. 963-964, 
Cyst none. 
Myzxosporidiwm.—Presenting special characters which clearly dis- 
tinguish this species. Fully developed forms assume very irregular and 
very variable shapes; remarkable for the presence of 1 to 4 or 5 immoy- 
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-mentionea central por- 
tion, each myxosporidium producing 2 spores. 
Spore.—Length (?), 5 to 8 uw; breadth (7), 65 yu. 
Habitat.—Free in the gall-bladder of Lophius piscatorius (angler) 
collected at Roscoff and at Le Croisic in August and September, 1892, 
