THE MYXOSPORIDIA, OR PSOROSPERMS OF FISHES. Ze) 
Finally Thélohan’s observations on Ceratomyxa spherulosa (pp. 76, 
277) indicate that perhaps a proper pigment (and not merely an extra- 
neous one, as hematoidin) may exist in this genus. 
VI. CHLOROMYXUM Mingazzini, 1890. 
Etymology not given. 
Boll. Soc. Nat. Napoli, tv, p. 160; ib., Thélohan, 1892, Bull. Soc. philomat. 
Paris, Iv, pp. 173, 176; ib., Gurley, 1893, Bull. U. S. Fish Com. tor 1891, 
XI, pp. 411, 412, 418; ib., Braun, 1893, Centralbl. f. Bakt. u. Parasitenkde, 
XIV, p. 739; ib., Braun, 1894, Centralbl. f. Bakt. u. Parasitenkde, xv, p. 87. 
Definition.—Chloromyxide with subspherical or ovate spores, whose 
breadth does not much exceed the length; valves hemispherical; spo- 
roplasm bilaterally and symmetrically situated; type C. leydigii. 
Synonymy.—By reference to table on page 115, it will be seen that 
Spherospora and Myxosomea differ in none of the characters there given, 
the genera at present resting solely upon spore-form. This is entirely 
insufficient to warrant the retention of both genera, especially as any 
reason which would justify the generic separation of the ovate from 
the subspherical bicapsulate spores, would equally justify a similar 
separation of the ovate from the subspherical quadricapsulate spores. 
From Chloromyxum the Spherospora-Myxosoma section has indeed 
the additional character of 2 capsules as opposed to 4 in Chloromyxum 
proper. I have already given (p. 115) my reasons for regarding the 
number of the capsules as a character secondary in importance to their 
grouping and position. Spherospora (including Myxosoma) is therefore 
here accorded subgeneric rank. 
CHLOROMYXUM, sens. strict. 
Definition.—Quadricapsulate Chloromyxa; type C. leydigit. 
93. Chloromyxum incisum Gurley, 1893.! Pl. 57, fig. 1. 
(Psorosperms of Raja batis, Leydig, Miiller’s Archiv., 1851, pp. 225-6, 234, pl. 
8, fig. 4a-f.) : 
Chloromyxum incisum, Bull. U. S. Fish Com. for 1891, x1, p. 419; ib., Braun, 
1894, Centralbl. f. Bakt. u. Parasitenkde, xv, p. 87. 
Oyst unknown. 
Myxosporidium.—Biliary-yellow, mostly roundish or somewhat elon- 
gate, 29 to 88 yw (°0135--0405/’) in diameter, without or with 1to 4 pan- 
sporoblasts (Tochterblase), most of which last contain spores. As in 
the spore of Squatina squatina (M. leydigii), the sporoblasts increase at 
the expense of the other portions of the cell contents until they nearly 
fill the cell (fig. le, /). 
Spore.—Sharply cuneate-ovate, posterior border radiate-incised (caus- 
ing it to resemble a radiate-ribbed Lamellibranch shell); capsules 4, 
situate anteriorly, converging. 
Habitat.—Free in gall bladder of Raja batis L. (skate); present in 
great numbers. 
1 Concerning the relation between this species and the next, see the latter, under 
Synonymy. 
