THE MYXOSPORIDIA OF THE BEAUFORT REGION. 237 



practically every individual of these species examined except in very young sharks. Both vegetative 

 and sporulating trophozoites were abundant. "Gregarinoid forms" similar to those described by 

 Mingazzini and others were common. 



y, Chloromyzum granulosum, n. sp. (PI. xxiv, fig. 136-138.) 



Trophozoite. — Colorless to light yellow; elongated when first placed on the slide (fig. 136) but soon 

 became contracted and motionless; progressing by very slow amceboid movements. Ectoplasm usu- 

 ally not distinguishable, but in a few cases trophozoites were noticed which had formed one or two 

 short, lobose pseudopodia of hyaline ectoplasm. 



After having been on the slide for some time rounded trophozoites often became surrounded by a 

 distinct ectoplasmic layer. Entire trophozoite usually distinctly and coarsely granular, the granules 

 varying greatly in size and shape (fig. 136); sometimes indistinctly vacuolated. A few small fat glob- 

 ules present in younger trophozoites becoming more abundant with age. 



Diameter of rounded polysporous trophozoites about 30;u. 



Disporous and polysporous. 



Spore. — Approximately spherical, with four distinct ridges on post-capsular half of each valve 

 converging toward the capsular side (fig. 137, 138.) Sutural line forming a distinct ridge. Cap- 

 sules distinctly pyriform, convergent. 



Diameter of spore 7/1, diameter of capsules 2)i. 



Habitat. — Common in the urinary bladder of Tylosurus marinus during July and August. 



Remarks. — There is an interesting variation in the appearance of trophozoites from different fishes. 

 In some fishes all were colorless, while in others the larger trophozoites were distinctly yellow. 



Family MYXOBOLID.a; Thelohan. 

 Genus Myzobolus Butschli. 



Myzobolus capsulatus, n. sp. (PI. xxiv, fig. 139.) 



Trophozoite. — Very irregular in shape; distributed through connective tissues in state of "diffuse 

 infiltration." 



Polysporous. 



Spore. — Distinctly pyriform, strongly compressed parallel to sutural plane. Characterized by 

 exceptionally large pyriform capsules (fig. 139), which fill almost the entire cavity of sporocyst. Sporo- 

 plasm relatively small, limited to extreme postcapsular end of spore. lodinophilous vacuole visible 

 in living spore. 



Length of spore (i. e., along longitudinal axis) lo-ii^, width (along transverse axis) i6n, capsules 

 4fi wide by ii/i long, length of filament 84/11. 



Habitat. — Not uncommon in the visceral connective tissues of Cyprinodon Tiariegatus. 

 69571°— 18- 16 



