290 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 



Spore. — Possessing only one i)lane of symmetry, viz, tlie valve- 

 junction plane, ditlering in this respect from most other myxosporidiau 

 spores, Avhich have another such jjlane perpendicular to valve-juuctiou 

 plane. Form very remarlcable, comparable to a pod whose acuminate 

 extremities are oppositely directed; length ( ?),4to5// ; breadth (?), 8 to 

 9// . Capsules, 1 at each end (or wing?), their long axes oblique and 

 oppositely directed with reference to tlie long (transverse'?) diameter of 

 the s])ore. Filanumt extrusion very diflicult of i)roduction; produced 

 by nitric acid; length of til anient, 113//; sporoplasm nonvacuolate. 



Habitat. — Gall bladders of Onus trieirratus { = Moteila tricirraia), 

 Syngnathus {=Untelurus) ccquorcus (pipefish), and Blennius pholis, all 

 from Koscoff; in B. pholis from Concarneau; in Biphostoma { = Syngna- 

 thus) aeus (pipefish) and Callionymus lyra. 



The description of this species is not sufficient, in the absence of 

 figures, to warrant a positive ()i)iiiion as to its generic attinities. I have 

 attempted to construct from Tlielohan's description a diagram of the 

 spore, but without success. The prevalent very loose use of such terms 

 as "ends," ''extremities," "length," "breadth," etc., renders them 

 invalid for taxonomy, and the only course open seems to be to retain 

 this provisionally in Myxiilium^ noting that in its bivalve structure it 

 differs markedly from M. UeherlcUhnii^ the tyx)e S])ecies. 



102. Myxidium? sp. incert. PI. 47, iig, 6. 



Psorosperms of liaja batis, Leydig, 1851, Miillcr's Arcliiv., pp. 226, 234, pi. 8, fig. 

 4*7; ib., Leuckart, 1852, Archiv. f. yjbysiolog. Heilkde., xi, p. 436, fig. 21b. 

 Myxidium? sp. Gurley, 1893, Bull. U. S. Fish Com. for 1891, xi, p. 420. 



No description. The distinctness of this form from Chloroniyxum 

 incisnm was recognized by Leydig (j). ^I'A). 

 Jffabitat. — Free in bile ducts of Ra^a batis L, (skate). 



