260 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 
94. Chloromyxum leydigii Mingazzini, 1890. Pl. 37, figs. 2-7; pl. 38; pl. 39, 
figs. 1-3. 
Saas Spinax | Torpedo } Soy itian 
PP eelae vulgaris | narke, | canicnia, | |alaeniout 
“oe? | “psoro- |‘ psoro- | ‘psoro- | leydigii. | eS val Date. Authority ; reference. 
eee sperms” | sperms”) sperms” Resta ome | 
Lae of. of. of. | | 
| | 
| | * ‘| 5s 
x1 x2 x3 2. fo pseseoc esl osoctaars: ' 1851 | Leydig, Miiller’s Archiv., pp. 
| | | 224-5, 233-4, pl. 8, figs. 1-3, 5. 
a eae Saal ee ecten es Seeetedaec| este c ace clsceciscencliaece eae MLQoo) MGIC kant maul iia tan E ATG 
| Heilkde, XI, p. 435, plate, fig. 
22.5 
Se secrets Hae |..-se-----|---.------| Chloro- |........| 1890 | Mingazzini, Boll. Soc: Nat. 
myxum. Napoli, CV, pp. 160-4. 
ee a i piealieite ne Gall spenshs Sool etae ates |..........| Myxo- 1891 | Perugia, Boll. Scientif., Pavia, 
| | sporid- XIII, p. 23, figs. 1-6. 
| | ium. 
Reins Seis ete | ere'=satelteiasis (Saves ee _..-++++e+--| Chlero- | Myxo- | 1892 | Thélohan, Bull. Soc. philomat. |” 
| | myxum. | sporid- Paris, IV, pp. 166, 169, 170, 
| | ium. | | 173, 176. 
Bsniae ics [ikuwecee esses ste cee seweee ance Ghloxos |S2ess. 20) o1893' |) Gurley, bulls Ueissehishicone 
myxum. for 1891, XI, pp. 418-19. 
Reto krae eicta| Cap atte ne ras Sete eras | eae meeeies | Chloro- |........| 1893 | Braun, Centralbl- f. Bakt. u. 
| myxum. | Parasitenkde, XIV,pp. 738-9. 
Bie cee |eMtecwirece|voseesasoc|seneeceseet Chiloro-"|2..5s5--| 18940) Braun, .Centralbl sie Balsimus 
| | myxum. | | Parasitenkde, XV, p. 87. 
1 Leydig’s description is as follows (p. 233, pl. 8, fig. la—f): Myxosporidiwm (developmental stages). 
(1) Roundish myxosporidia (Mutterblase), 29u to 118 (:0135 to :0540’/) with a thin membrane and 
yellowish semifluid contents, containing a massof yellow granules concentrated toward the center, 
leaving a granule-free border (fig. la). (2) Other myxosporidia of the same size contain, in addition, 
several transparent pansporoblasts (Lochterblase), whose number varies with the size ef the myxo- 
sporidium, the smaller having but 1, the largest asmany as 6. (3) Other myxosporidia show spores 
in the sporoblasts, always lin each (fig. 1c, d). (4) In the later stages the sporoblasts become very 
large, nearly filling the myxosporidium, and separated from its membrane only by a zone which 
represents a greatly diminished state of the granular mass. Yellow color due to the absorption of 
bile pigment. That the pansporoblast membrane is impervious to this pigment is shown by the 
unstained condition of the latter. Spore: Sharp-contoured, untailed, acute cuneate-oval, anterior 
extremity pointed. Capsules 4, situated at the anterior end. Free sporesalso occur. Habitat: Free 
in gall-bladder of Squatina angelus. 
2The form found in gall-bladder of Acanthias (Spinax) vulgaris is (fide Perugia) referable to this 
species. Leydig's description is as follows (pp. 224-5, 233, pl. 8, fig. 2): Myxosporidiwm: 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 forms are united resembling 
a segmenting ovum; nomovements or pansporoblasts seen. Habitat: Free in gall-bladder of Spinax 
vulgaris. 
3 Leydig’s description (pp. 225, 233, pl. 8, fig. 3): Myxosporidiwm (developmental stages). (1) Large 
(29 to 118; 0135 to :0540'/’) yellow club-shaped protoplasmic masses of same general character as in 
Squatina angelus; pansporoblasts absent from this stage. (2) The large yellow masses contain 
much smaller (154; *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 of Vorpedo narke. 
4Leydig’s description (pp. 225, 284, pl. 8, fig. 5): Myxosporidium: Size 29u to 147u (:0135 to -0675/") ; 
shape, roundish, elongated, retort-shaped, or vermiform with clubbed ends. Many show only 
membrane and contents; others show well-developed pansporoblasts, sometimes as many as 12, each 
containing 1 spore. Habitat: Free in gall-bladder of Scyllium canicula. 
5 On the page cited, Leuckart virtually says that his flgure is ‘‘ after Leydig,” and a comparison 
with figs. 2a), 2a, (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 Plagiostomi (Torpedo, Scyl- 
lium, Squatina, Trygon, Raja, Mustelus, Pristiurus, etc.) belong to the same species. 
There is, however, in Mingazzini’s paper almost nothing te show that 
he studied the spore at all. Only a single sentence refers to the 
