214 REPORT OF THE COMMLSSIONER OF FISH AND FISHERIES. 



Kelative to its generic relations Perugia says: 



This form might be referred to the genus Myxoholiis, from which it seems to me 

 to differ only by a little. The different hosts and the form of the spores only might 

 canse it to be regarded as a distinct species. 



40 Myxobolus sp. incert. PI. 14, fig. 7. 



(Pso#Dsperm of Xais proioscidea, Lieberkiihn in I^iitschli. 1882, Bronn's Thier- 

 Reicli, I, p. 590, pi. 38, fig. 23 ; ib., Th<?lohan, 1890, Anual. de Microgr., ii, p. 

 193; ib. Pfeiffer, 1890, Virchow's Archiv. f. pathol. Auat. u. Physiol., txxii, 

 p. 5.57; (7). Brann, 1893, Centralbl. f. Bakt. n. Parasitenkde, xiv, p. 739.) 



No description. Its symmetry sliows it to be a Mi/xoholus. Observed 

 by Lieberlviilm, and communicated by him to Biitschli; publislied only 

 by the latter.' 



Habitat. — Fais prohoscidea (a Tvorm). 



41 Myxobolus sp. incert. PI. 15, figs. 1-6. 



Psorosperms of Esox luciuf, Lieberkiihn, 1855, Mem. Cour. et Mem. Sav. Strang. 

 Acad. Roy. Belg., xxvi, p. 37, pi. 10, figs. 10-12, pi. 11, figs. 1-4; f ib. Biitschli 

 1882, Bronn's Thier-Reich, i, pi. 38, fig. 11. 



Cyst. — Size 8 mm. (0-31 inch) by 4-25 mm. (0-17 inch); contents "granu- 

 lar matter" alone, spores alone, or both " granular matter" and spores, 

 in variable proportion. 



Myxosporidium unknown. 



Spore. — Oval or circular, tailed or un tailed; the 2 kinds often mixed 

 without order in the same cyst. 



Rahitat. — Cysts of branchii^e of Lncins lucuis L. (pike). 



It is hard to know what to do with this form. In spite of his asser- 

 tion that tailed and untailed forms occur in the same cyst, Lieberkiihn 

 appears to figure only untailed forms. In view of this, and provision- 

 ally until some other observer shall confirm this observation, I prefer 

 to recognize this as a "form" distinct from the tailed one having 

 approximately the same habitat. (See also p. 256.) 



42 Myxobolus oviformis Th61ohan, 1892. PI. 14, fig. 8, 



( " Myxosjioridian spore f If. muHfri Biitschli?) " oi Cyprinns carpio and of 



GobioJiuviatiUs,- Thelohan, 1890, Annal. de Microgr., ii, pp. 200, 204, 209, 



210, 211, 213, pi. 1, figs. 8-11 ; spore of C. carpio, Th<51ohan, 1890, Compt. 



Rend. Acad. Sci. Paris, cix, p. 921). 

 Myxobolus oviformiH Th(^lohan, Bull. Soc. philomat. Paris, iv, p. 177; ib., Gurley, 



1893, Bull. U. S. Fish Com. for 1891, xi, p. 414; t6., Braun, 1893, Centralbl. 



f. Bakt. u. Parasitenkde, xiv, p. 739; ib., Braun, 1894, Centralbl. f. Bakt. u. 



Parasitenkde, xv, p. 87. 



Cyst and myxosporidium not mentioned. 



Spore. — Flattened-ovoid, with notably attenuate anterior extremity; 

 length, 10 to 12 /<; breadth, 8/<; capsules relatively large (6/^); nuclei 

 adplur.^3', vacuole, present. 



1 Braun's language is slightly ambiguous : "Eine lil'erc Notiz, von Lieberkiihn, 

 erwiihnt" the occurrence of Myxosporidia in invertebrates. 



2 An ambiguous expression of Lieberkiihn's (Bull. Acad, Roy. Belg., 1851, xxi, pt. 

 2, pp. 22-23) may refer to an observation of a species upon the branchiae of this fish. 



