THE MYXOSPORIDIA, OK PSOROSPERMS OF FISHE3. 259 



Fiiiiiliy Tlu'loliaii's observatioiKs on Ccrdiotni/.ra splufrnlo.sa (pp. 7(i, 

 277) indicate that perhaps a proi)i'r pigment (and not merely an extra- 

 neous one, as lia^matoidin) may exist in this genus. 



Vr. CHLOKOMYXUM Miugaz/iui, 18i)0. 



Etymolof^y not givcMi. 



Boll. Soc. Nat. Napoli, iv, p. 160; ih., Thelohau, 1892, Dull. Soc. philoinat. 

 Paris, IV, pp. 173, 176; ib., Gurloy, 1893, Bull. IJ. 8. Fish Com. for 1891, 

 XI, pp. 411, 412, 418; ih., Brauu, 1893, Ceutralbl. f. Bakt. u. Parasiteukde, 

 XIV, p. 739; ib., Hraun, 1894. Coiitralbl. f. Bakt. u. Parasiteukde, xv, p.87. 



Definition. — Ghloromifxidte with subspherical or ovate spores, whose 

 breadth does not much exceed tlie length; valves hemisi)herical; spo- 

 roplasm bilaterally and symmetrically situated; type 6'. leijdiyii. 



Synoni/my. — By reference to table on page 115, it will be seen that 

 Spliwrospora and Mfixosoma differ in none of the characters there given, 

 the genera at present resting solely upon spore-form. This is entu-ely 

 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 quad ricapsul ate spores. 



From Ghloromyxam the Sphwrospora-MtjxoHoma section has indeed 

 the additional character of 2 capsules as opi)osed to 4 in Chloromyxnm 

 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 und position. Spha;rospora {inclwdiug Myxosoma) is therefore 

 here accorded subgeneric rank. 



Chi.oromyxum, sens, strict. 

 Definition. — Quadricapsulate Ghloromyxa; type C leydigii. 

 93. Chloromyxum incisum Gurley, 1893.^ PI. 37, tig. 1. 



(Psorospenus of Haja halis, Leydig, Miiller's Arcliiv., 1851, pp. 225-6, 234, pi. 



8, tig. 4a-/.) 

 Chloromi/xum incisum, BnU. U. S. Fisli Com. for 1891, xi, p. 419; ib., Braun, 

 1894, CeutralM. f. Hakt. u. Parasitenkde, xv, p. 87. 



Cyst unknown. 



MyxoHporidium. — Biliary-yellow, mostly roundish or somewhat elon- 

 gate, 29 to 88 fx ('Oloo-'Olon'") in diameter, without or with Ito 4 pan- 

 sporoblasts {Tochterhlase), most of which last contain spores. As in 

 the spore of Sqnatind sqiidtina {M. leydigii), tlies])oroblasts increase at 

 the expense of the other portions of the cell contents until they nearly 

 fill the cell (tig. le,/). 



iSpore. — Sharply cuneate-ovatc, posterior border rddiate-ineised (caus- 

 ing it to resend)le a radiate-ribbed Lamellibianch shell); capsules 4, 

 situate anteriorly, converging. 



Habitat. — Free in gallbladder oi Raja batis L. (skate); present iu 

 great numbers. 



'Concerning the rolatiou hctwccii this spcrios and the next, soo the latter, under 

 Sr/novijmy. 



