166 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES, 
NON-MYXOSPORIDIAN. 
1. Psorospermia scizenz-umbre Robin, 1853.!_ Pl.1, figs. 1+. 
Hist. Nat. des Végét. Parasites, pp. 314-321, pl. 14, figs. 14, 15; pl. 15. 
Robin defined the species as follows: 
Cellule ovoidex vel raro spherice aut ovoideo-elongate; coriacee, intus granu- 
lose, achromatice, luteo-succinee vel luteo-fusce. Long., mm. 0-027; lat., mm. 
0:018; spherice, mm. 0-017. In stratis (coloniw) indefinitis, vel cylindricis, fila- 
mentosis, circulatim flexuosis, continuis coherentes, raro isolate. 
Hab. Infra membranam mucosam cavi branchialis insitam in septo abdomino-bran- 
chio scizene-umbre. 
The species consists of three varieties. The description is Robin’s 
condensed and rearranged. 
VARIETY 1.—(Robin’s plate 15, figs. 2a, b; 4a, b; 6.) 
Microscopic.—Cells ovoid (27 by 18 ~) or spherical (diameter 17 »), a 
little flattened on one side, having an amber-yellow tint with a white 
shining reflex, strongly refringent, resembling fat drops; ovoid cells a 
little flattened with clearly defined borders and double contoured walls 
(1 » thick) rupturable 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»in diameter. Cells 
not altered by acetic acid or ammonia. 
Macroscopic.—Cells cohering into grayish yellow, flexuous cylinders 
(colonies) 0-5 mm. in diameter (plate 15, fig. 1); length sometimes 1 in. or 
more. Cylinders convoluted, circular, endless, usually united in pairs 
by a double or triple delicate transparent connective tissue sheath 
(fig. 2e, 7, g), the whole forming a delicate string rolled upon itself, in 
every direction (pl. 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, either by simple cohesion or by amorphous 
matter, which latter forms around each cylinder a (hardly perceptible) 
thin enveloping membrane (plate 14, figs. 2c, d; 4c, d). These fila- 
ments are only visible under a lens, being only +5 to $ as thick as the 
cylinders of the first variety. 
1This species was first described as a constituent part of the body of the host by 
Robin, in his paper ‘‘Anatomie d@’un organe découvert sur l’ombre (Sciana wmbra) 
read to the Société philomatique Nov. 28, 1846 (Procés verb. d. la Soc. philomat. Paris, 
1846, p. 140; also Journ. l’Institut No. 683, Feb. 3, 1847, Paris, XV, p. 41). Not seen; 
Jide Robin, 1853, p. 314. 
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