106 ILLINOIS BIOLOGICAL MONOGRAPHS [344 



SINUOLINEA OPACITA Davis 

 [Fig. 219] 

 1917 Sinuolinea opacita Davis 1917 : 234 



Habitat: Urinary bladder of Paralichthys albigiUtus; Beaufort (August). 



Vegetative form: Rounded or slightly irregular. Body colorless and 

 opaque. Movements slow. Pseudopodia short lobose. Ectoplasm not 

 distinct, except around ends of pseudopodia, where it forms a thin hyaline 

 layer. Endoplasm opaque, finely granular, with numerous greenish-yellow 

 fat globules varying greatly in size. Diameter of rounded sporulating 

 trophozoites 22jli, exceptionally large trophozoites 100;u. Disporous. 



Spore: Nearly spherical, with flattened, lateral appendages extending 

 from the posterior side. Sutural plane slightly twisted on its axis. Sutural 

 ridge distinct. Polar capsules large. Coiled polar filament distinct. 

 Sporoplasm finely granular, containing several comparatively large fat 

 globules. Dimensions: diameter 12 to 13/x, diameter of polar capsules 4/*. 



SINUOLINEA BRACHIOPHORA Davis 

 [Fig. 220] 

 1917 Sinuolinea brachiophora Davis 1917 : 234 



Habitat: Urinary bladder of Paralichthys albiguttus; Beaufort (August 

 only in one fish). 



Vegetative form: Rounded to somewhat irregular. Body colorless. 

 Ectoplasm hyaline. Endoplasm granular, with numerous large fat glob- 

 ules. Disporous. 



Spore: Nearly spherical, with a long lateral appendage from each 

 valve. These appendages are empty except at extreme distal end, which 

 contains a granular mass, probably the remains of the parietal cell. Sutural 

 plane slightly oblique to longitudinal axis. Sutural ridge distinct. Polar 

 capsules and capsulogenous cells large, occupying more than half of cavity 

 of spore. Sporoplasm finely granular. Dimensions: length exclusive of 

 appendages 9 to ll/x, length of appendages 18 to 22/i, breadth of spore 9fx, 

 diameter of polar capsules 3.5ai- 



Remarks: Davis mentions that in many respects this species is very 

 similar to S. opacita, which occurs in the same host. 



Suborder PLATYSPOREA nom. nov. 



The definition of the suborder is recorded on page 57. 



Family MYXIDIIDAE Thelohan 



1892 Myxididees Thelohan 1892 : 173, 175 



1893 Myxidiidae Gurley 1893 : 412 



The characters of the family are described on page 57. 



