SPOROZOA, GREGARINIDA 547 



cysts ellipsoid, with thick envelope; with 6-8 sporoducts; spores 

 barrel-shaped. One species. 



A. dacnccola V. (Fig. 233, c). In the midgut of the coleopteran 

 Dacne rufifrons; 2 sporadins in syzygy 1 00-300 m by 20-50^; cysts 

 without envelope, 130-150 n by 80-90/*; sporoducts 40-50/x long; 

 spores in chain, dolioform, 6> by 4^ (Vincent, 1924). 



Genus Carcinoecetes Ball. Sporadins in syzygy of 2 or more indi- 

 viduals; epimerite rudimentary; cysts without sporoducts; spores 

 round to ovoidal, not in chain; in gut of Crustacea (Ball, 1938). 



C. hesperus B. (Fig. 233, d, e). 2-6 sporadins in association; sporad- 

 ins up to 320^ by 9m ; cysts about 140/i by 123^, attached to the wall 

 of hindgut; spores 8.6/i by 7.7/z, with 8 radially arranged sporozoites; 

 in gut of the striped shore crab, Pachygrapsus crassipes; in California, 



C. bermudensis B. In the mid- and hind-gut of Pachygrapsus trans- 

 versus; in Bermuda (Ball, 1951). 



C. mithraxi B. In the gut of Mithr ax forceps; in Bermuda. 



C. calappae B. In the gut of Calappa flammca; in Bermuda. 



Genus Heliospora Goodrich. Elongated, septate; spores more or 

 less spherical, with equatorial ray-like processes (Goodrich, 1949). 



H. longissima (Siebold) (Fig. 234, b-e). Trophozoites elongate fili- 

 form, up to 228m long; no intracellular stage; epimerite small, and is 

 retained until the sporadins roll up for encystment; spherical cyst 

 thinly walled and ruptures easily; microgametes flagellated; spores 

 7-8/x in diameter, with eight sporozoites and bear six long ray-like 

 processes at the equator; in the gut of Gammarus pulex. 



Genus Rotundula Goodrich. Rotund; button-like epimerite; pre- 

 cocious association; cyst without duct; spores, small, spherical or 

 subspherical (Goodrich, 1949). 



R. gammari (Diesing) (Fig. 234,/). Cysts 40-50^; microgametes 

 flagellate, 4/z in diameter; spores spherical, 5-6^ in diameter; in the 

 gut of Gammarus pulex. 



Family 6 Leidyanidae 



Similar to the last two families; but sporadins are solitary and 

 epimerite simple knob-like; cysts with several sporoducts. 



Genus Leidyana Watson. Solitary; epimerite a simple globular 

 sessile knob; cysts with ducts; spores dolioform (Watson, 1915). 



L. erratica (Crawley) (Fig. 233,/). Sporadins up to 500^ by 160/x; 

 cysts about 350^ in diameter; membrane about 30/x thick; 1-12 

 sporoducts; spores extruded in chains, 6/z by 3^; in gut of Gryllus 

 abbreviatus and G. pennsylvanicus. 



