ON THE CLASSIFICATION OF THE MYXOSPORIDIA. 
419 
Chloromyxum mucronatum sp. nov. 
(Psorosperms of Gadus lota Lieberkiihn, Muller’s Arcliiv., 1854, pp. 352-3, 368, t. 14, f. 5,6.) 
Myxosporidium : Measuring 75 /< or less; spherical or ellipsoidal, rarely irregular. 
Spore: Broadly rounded-oval; concave pointed anteriorly; length ad max., 8 ■//. 
Habitat : Free in urinary bladder of Lota lota L. 
Chloromyxum leydigii Mingaz., 1890. 
Boll. Soc. Nat. Napoli., iv, pp. 160-4 (see also the nest species). 
Chloromyxum incisum sp. nov. 
(Psorosperms oi Raja batis Leydig, Muller’s Archiv., 1851, pp. 225-226, 234, t. 8, f. 4a-/.) 
Myxosporidium: Biliary yellow, roundish or somewhat elongate, 29 to 88 ja in 
diameter, without or with 1 to 4 pansporoblasts. 
Spore : Sharply cuneate-oval, posterior border radiate-incised , resembling a radiate- 
ribbed Lamellibrancli shell. 
Habitat : Free in gall-bladder of Raja batis L. 
In face of the striking difference between this spore-form and C. leydigii , the 
present evidence (which consists of Mingazzini’s opinion* without any detailed evi 
dence, Perugia’s opinion,! too little explicit, and the probably not independent opinion 
of TMlohan t) is insufficient to warrant the fusion of the two forms, especially as it 
does not appear that either Mingazzini or Perugia examined the gall-bladder of 
Raja batis. 
Chloromyxum ? ? congri Perugia, 1891. 
Myxosporidium congri. Boll. Scientif. Pavia, xm, pp. 24-5, f. 15-20. 
Habitat: Gall-bladder of Leptocephalus conger collected in August, 1890. 
Subgenus Si'H.krospoka Thdlohan, 1892. 
Bull. Soc. philomat. Paris, iv, p. 175; Mixosoma) et Myxosoma ibid., p. 175. 
Definition: Bicapsulate Cliloromyxa; type Chloromyxum (8.) elegans Thel. 
Chloromyxum elegans Thdlohan, 1892. 
Sphcerospora elegans, Bull. Soc. philomat. Paris, iv, pp. 167, 175. 
Chloromyxum dujardini Thdlohan, 1892. 
(Psorosperms of Cyprinus rutilus (pars) Muller, Miiller’s Arcliiv., 1841, pp. 481, 486, t. 16, f. 4 b, c; 
psorosperm of Cyprinus erythrophthalmus Dujardin, 1845, Hist. Nat. des Helminthes, p. 
644, t. 12, f. 12 N,, 12 No.) 
Mixosoma dujardini, Bull. Soc. philomat. Paris, iv, p. 175. 
Myxosporidium: 1.25 to 1.50 mm. long. 
Spore : Ovate, pointed anteriorly, broadly rounded posteriorly ; length 10 to 12 p • 
capsules 2, of equal size. 
Habitat: Branchial lamellae of Leuciscus ( Scardinius ) erythrophthalmus from the 
Vilaine, at Rennes, France ; pseudobranchiae of Leuciscus rutilus , from German rivers. 
Concerning the form observed by him, Muller says : 
Once there was found on the pseudobranchiae ( Nebenkiemen ) a mass of small yellow cysts. The 
size of this mass was 4 lines. This time all the cysts contained elongate capsules with pointed ante- 
rior and bluntly rounded posterior ends (f. 4 b). On the flat border the convex surfaces were exactly 
equal and the two diverging vesicles were attached interiorly at their points. 
*Boll. Soc. Nat. Napoli, 1890, iv, pp. 160-161. 
t Boll. Scientif. Pavia, 1890, xii, p. 138. 
1 Bull. Soc. philomat. Paris, 1892, iv, p. 176. 
) Type Chloromyxum ( Mixosoma ) dujardini. 
