260 REPORT OF THE COMMISSTONER OF FISH AND FIS^HERIEH. 



94. Chloroinyxum leydigii Mingaz/:ini, 1«90. PI. 87, il-a. 2-7; pi. 38; pi. 39, 

 figs. 1-3. 



' Leydig's description is as follows (p. 233, pi. 8, flg. la-/) : Myxosporidmm (developmental stages). 

 (1) Roundish myxosporidia (Mxitterhlage) , 29^ to llS/x (-0135 to -0540'") with a thin menihrane and 

 yellowish semifluid contents, containing a mass of yellow granules concentrated toward the center, 

 leaving a granule-free border (flg. la). (2) Other myxosporidia of the same size contain, in addition, 

 several transparent pansporohiasts (TochUrhlase), whoso number varies with the size of the myxo- 

 sporidium, the smaller having but 1, the largest as many as 6. (3) Other rayxoaporidia show spores 

 In the sporoblasta, always 1 iu each (flg. Ic, d). (4) In the later stages the sporoblasts become very 

 large, nearly filling the myxosporidium, and separated from \i» membrane only bj' a zone which 

 represents a greatly diminished state of the graunlai- mriss. Yellow color due to the absorption of 

 bile pigment. That the pansporoblast membrane is impervious to this pigment is shown by tho 

 unstained condition of the iatter. Spore: Sharp-contoured, untailed, acute cunoate-oval, anterior 

 extremity pointed. Caiisulcs 4, situated at the anterior end. Pree spores also occur. Habitat: Free 

 ,in gall-bladder of S^jnatina angelus. 



2 The form found iu gall-bladder of Aeanthias (Spivax) vulgaris is (Jide Perugia) referable to this 

 species. Leydig's description is as follows (pp. 224-5, 233, pi. 8, fig. 2): Myxospon'-'ium: Visible to 

 naked eye, similar to that of Squatina angelus except that the appearance is more varied; round, 

 vermiform, and retort-shaped forms occurring; frequently 2 or 3 round forma are united resembling 

 a segmenting ovnm; no movements or pansporoblasts seen. Habitat: Free in gall-bladder of jSpinaa; 

 vulgaris. 



'Leydig's description (pp.225, 233, pL 8, flg. 3) : Jfya;osport(iiMm (developmental stages). (1) Large 

 (29 to 118.a ; -0135 to -0540 ' ") yellow club-shaped protoi)lasmic masses of same general character as in 

 Squatina angelus; pansporoblasts absent from this stage. (2) The large yellow masses contain 

 much smaller (15/x; -00675 '") colorless vesicles with granular contents, the latter mostly heaped 

 together. (3) A transparent pansporoblast is visible through the finely granular contents. On addi- 

 tion of sodium hydrate, spores become visible in it. Numerous free spores are also seen. Habitat: 

 Free in gall-bladder o[ Torpedo narke. 



^Leydig's description (pp. 225, 234, pi. 8, flg. 5): Myxosporidium: Size 29;* to 147ft (-0135 to -0675'"); 

 shape, roundi.sh, elongated, retort-shaped, or vermiform with clubbed ends. Many show only 

 membrane and contents; others show well-doveloped pansporoblasts, sometimes as many as 12, each 

 containing 1 spore. Habitat: Free in gall-bladder of Scyllium canicula. 



« On the page cited, Leuckart virtually says that his figure is "after Leydig," and a comparison 

 with figs. 2a,, 2a2 (plate 39) shows it to be a generalized composite from them. 



Concerning the synonymy, Mingazzini says: 



All those examined by me in the various .species of the PJagiosiomi {Torpedo, Scyl- 

 lium, Squatina, Trygon, liaja, Musielus, Pristiurus, etc.) belong to the same species. 



Tliere is, however, in Mingazzini's paper almost nothing to show that 

 he studied the spore at all. Only a single sentence refers to the 



