418 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Myxobolus creplini, * sp. nov. 
(Psorosperms of Acerina vulgaris Creplm., 1842, Wiegm. Archiv. f. Naturgesch, i, pp. 61-63, t. 1, 
f. 1 a-e; of. Weltner, 1892, Sitzungs.-Ber. Ges. Naturf. Freunde Berlin, pp. 29-31, 34). 
Spore: Body elongate ventricose-elliptic; length 17.3 //; breadth 5.8 //; tail simple, 
as long as or a little longer than the body; capsules 2, equal. 
Habitat: On Gymnocephalus cernua L., collected March 14, 1837. 
Weltner believes the form observed by him in the ovary of Esox Indus to be iden- 
tical with this form. Weltner’ s species was sometimes tailed and sometimes untailed. 
Myxobolus psorospermica Thelohan, 1892. 
Henneguya psorospermica , Bull. Soc. pliilomat. Paris, iv, pp. 167, 176. 
Myxobolus diplurus, sp. nov. 
(Psorosperms of kidney of Lota vulgaris Biitschli, 1882, Bronn’s Thier-Reich, i, t. 38, f. 21.) 
Description (from figure). 
Spore : Capsules 2, equal, posteriorly situated ; tail double from base, the 2 halves 
adnate. 
Habitat: Kidney of Lota lota L. 
CHLOROMYXIBJE fam. nov. 
( “ Chloromyxdes ” et “Myxidi^es” (pars) Thelohan, 1892, Bull. Soc. philomat. Paris, iv, pp. 
173, 176.) 
Definition: Phatnocystes destitute of antero -posterior, but possessing bilateral, 
symmetry;! capsules in 1 group at the anterior end; a bivalve shell, the plane of 
junction of whose valves is perpendicular (*?) to the longitudinal; no vacuole; type 
genus Chloromyxum Ming. 
CHLOROMYXUM Mingazzini, 1890. 
Bull. Soc. Nat. Napoli, iv, p. 160; ib., Sphcerospora, Myxosoma et Mixosoma i Thflohan, 1892, 
Bull. Soc. philomat. Paris, iv, pp. 173, 175-6. 
Definition : Chloromyxidce with subspherical or ovate spores, whose breadth does 
not exceed their length; valves hemispherical; sporoplasm bilaterally and symmet- 
rically situated; type G. leydigii. 
Chloromyxum sens, strict. 
Definition: Quadricapsulate Chloromyxa; type G. leydigii. 
Chloromyxum fluviatile Thelohan, 1892. 
Bull. Soc. philomat. Paris, iv, pp. 173, 176, fig. 2. 
* Dedicated to the discoverer, J. C. L. Creplin. 
t Imperfect from unilateral position of sporoplasm in Ceratomyxa. 
(See subgenus Sphcerospora. p. 419. The table on p. 411 shows that Sphcerospora and Mixosoma 
differ from Chloromyxum by only a single character, viz : the number of the capsules. As shown on p. 
411, this character is a subordinate one compared to the grouping and position of the capsules, in 
which latter all the three genera agree. They may, therefore, all be grouped under one genus. 
The two unispecific genera Sphcerospora and Mixosoma have (at least as far as the record now 
shows) absolutely no distinctive character but the shape of the spore. They are therefore fused. Provi- 
sionally (but with some hesitation) I have recognized Sphcerospora (including Mixosoma) as a sub- 
genus. Its sole claim to such distinction rests on 2 capsules as against 4 in Chloromyxum proper. It 
is also worthy of note that the possibility of transitions are by this definition arbitrarily excluded, 
inasmuch as all our experience shows that increase of capsule number is by duplication and not by 
addition. So that the possibility of its ultimate entire fusion with Chloromyxum seems by no means 
remote. 
