166 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 



NON-MYXOSPORIDIAN. 



1. Psorospermia sciasnae-umbrae Robin, 1853.' PI. 1, figs. 1^. 



Hist. Nat. des Veget. Parasites, pp. 314-321, pi. 14, figs. 14, 15; pi. 15. 



Robin defined the species as follows: 



Cellulne ovoideiB vel raro sphericse aut ovoideo-elongatie ; coriaceie, intiis granu- 

 losfB, acliromaticiB, luteo-succineiB vel luteo-fuscae. Long., mm. 0"027; lat., mm. 

 0-018; spbericae, mm. 0-017. In stratis (colonise) indefiuitis, vel cylindi-icis, fila- 

 meutosis, circiilatiiu flexuosis, continiiis coli;prentes, raro isolatie. 



Hab. Infra membranam raucosam cavl brauchialis iusitam in septo abdoinino-bran- 

 cliio 8cia»nie-uinbr;e. 



The species consists of three varieties. The description is Robin's 

 condeiised and rearranged. 



Vahikty 1.— (Robin's plate 15, figs. 2a, h; 4a, h; 6.) 



Microscopic. — Cells ovoid (27 by 18 ,a) or spherical (diameter 17 //.), a 

 little flattened on one side, having an amber-yellow tint with a white 

 shining retlex, strongly refringent, resembling fat drops; ovoid cells a 

 little flattened with clearly defined borders and double contoured walls 

 (1 , a thick) rnptnrable by pressure, cell-contents then escaping. . Con- 

 tents clear, yellow, homogeneous, strongly refracting, liquid, in which 

 float 5 to 8 or more, strongly refringent granules, 1 /i in diameter. Cells 

 not altered by acetic acid or ammonia. 



Macroscopic. — Cells cohering into grayish yellow, flexuous cylinders 

 (CDlonies) O-o mm. in diameter (plate 15, fig. 1) ; length sometimes 1 m. or 

 more. Cylinders convoluted, circular, endless, usnally united in pairs 

 by a double or triple delicate transparent connective tissue sheath 

 (fig. 2e, /, g), the whole forming a delicate string rolled upon itself, in 

 everj^ direction (pi. 1, fig. la of this paper) into a flattened spherical, 

 lobulated or nonlobulated mass, whose size varies from that of a nutlet 

 to that of a fist. • 



Variety 2. — (Robin's plate 15, figs. 2c, d; 4c, d.) 



Microscopic. — Cells ovoid, white, colorless, transparent, with a shining 

 reflex, with more numerous and larger granulations than the other 

 varieties. 



Macroscopic. — Cells united into opaque, milk-white, filamentous, con- 

 tinuous, endless cylinders, eitlier by simple cohesion or by amorphous 

 matter, which latter forms around each cylinder a (hardly perceptible) 

 thin enveloping membrane (plate 14, figs. 2c, d; 46', d). These fila- 

 ments are only visible under a lens, being only -^^q to ^ as thick as the 

 cylinders of the first variety. 



'This species was first described as a constituent part of the body of the host by 

 Robin, in his paper "Auatomie d'un organe deconvert sur Tombre (Schrna umbra) 

 read to the SocUU i)hUnmatique Nov. 28, 1846 (Proc^s verb. d. la Soc. philomat. Paris, 

 1846, p. 140; also .Tonrn. I'Institut No. 683, Feb. 3, 1847, Paris, xv, p. 41). Not seen; 

 jide Robin, 1853, p. 314. 



