236 BULLETIN OF THE BUREAU OF FISHERIES. 



porarily) anterior end (fig. 129), the advancing edge of the ectoplasm forming small, conical pseudopodia, 

 which are rapidly retracted and new ones formed in their place. Endoplasm not as transparent as 

 ectoplasm, vacuolated, the vacuoles in some cases being very distinct, in others barely distinguishable. 

 Endoplasm between the vacuoles distinctly granular. As trophozoites increase in size, vacuolated 

 structure becomes more evident, the endoplasm often having the appearance of a foam or emulsion, 

 as is well represented by Thelohan (1895, pi. vni, fig. 55). Tlie large sporulating trophozoites present 

 a very different appearance. They are flattened, leaflike, with a very irregular contour and usually 

 distinctly yellow, although large sporulating trophozoites were seen which were perfectly colorless. 

 In medium-sized trophozoites the ectoplasm forms a transparent layer around the entire trophozoite, 

 but in larger individuals ectoplasm becomes thinner until it can be distinguished only at the ends of 

 the rounded, pseudopodialike projections. Larger trophozoites are often filled with spores arranged in 

 pairs inclosed in a common membrane, as described by Schroder (1907) for S. sabrasesi. Such tropho- 

 zoites often lose the characteristic vacuolated and granular structure and appear hyaline throughout. 

 This is probably due to degenerative changes preparatory to the disintegration of the trophozoite. The 

 trophozoites vary greatly in size and shape, the largest trophozoite measured having an extreme diameter 

 of 900^. 



Polysporous. 



Spore. — Fusiform, ends strongly truncated. Sporocyst comparatively thick and impervious to 

 reagents; usually showing on its outer surface indistinct, parallel, longitudinal striations (fig. 130). 

 Capsules large. Coiled filaments distinct, short, thick with rounded ends (fig. 131). Sporoplasm 

 granular, the two nuclei distinctly visible as clear vacuolarlike structures. 



Length of spore 17-20/i, width 5-6/1; length of filament 20^. 



Habitat. — Common in the gall bladder of Siphostoma floridct a^d S. louisiance. A large number of 

 fishes were examined during June, July, and August and were all found to be infected. Usually the 

 parasites were folded together in a mass which sometimes almost filled the gall bladder. 



Remarks. — Both spores and trophozoites differ in some minor respects from Thelohan 's description, 

 the trophozoites being much more irregular and the spores larger, while the longitudinal striations 

 are very faint or entirely absent. 



Genus Zschokkella Auerbach. 



Zschokkella globulosa, n. sp. (PI. xxiv, fig. 132-135.) 



Trophozoite. — Colorless, transparent; rounded; slowly amoeboid, forming short, lobose pseudopodia 

 (fig. 132, 134). Ectoplasm not distinct, trophozoites being distinctly granular throughout. Charac- 

 terized by the presence of several large fat globules. 



Diameter of rounded sporulating trophozoites about 15-16;!. 



Monosporous and disporous. 



Spore. — Capsular side flattened; postcapsular side rounded (fig. 134, 135). Sutural plane twisted 

 on its axis and oblique to longitudinal axis; sutural line forming a distinct, sinuous ridge around spore. 

 Capsules located at ends of spore and opening on capsular side. Sporoplasm finely granular, very 

 transparent. 



Length of spore iifi, width 7/n; diameter of capsules 3m. 



Habitat. — Found in the lu-inary bladder of Spheroides maculatus taken August 2, 1915. Both 

 vegetative trophozoites and spores were abundant. 



Family CHLOROMYXrD.a; Thelohan. 



Genus Chloromyxum MLngazzini. 

 Chloromyium leydigi Mingazzini. 



ChtoToviyxum leydigi, Mingazrini, 1890, p. 160. 

 ChloTomyxum leydigi, and C. inctsum, Gurley, 1893. p. 359. 

 Chloromyxnm leydigi and C. incisum, Thelohan, 1895, p. 345. 

 Chloromyxum leydigi, Doflein, X898, p. 160. 

 Chloromyrum leydigi, Erdmaxin, 1911. 



This species is very widely distributed among elasmobranchs. It was found In the gall bladder 

 of the following species: Dasybatis hastatus, Dasybatis sabina, Pteroplatea maclura, Socliodon terrcE- 

 novcB, Cestracion zygcBna, Cestracion tiburo, and Carcharhinus limbaius. Trophozoites were present ia 



