2l6 BULLETIN OF THE BUREAU OF FISHERIES. 



Genus i. Leptotheca Thelohan. 

 Valves of the spore short and roimded. 



Genus 2 . Ceratomyxa Thelohan. 

 Valves of the spore produced into long, conical processes. 



Legion II. POLYSPOREA DoBein. 

 Each trophozoite produces more than one, usually a number, of pansporoblasts. 



Family 1. MYXIDIID.S Thelohan. 

 Spores with two capsules. 



Genus i. Sphaerospora Thelohan. 

 Spores spherical. 



Genus 2. Myxidium Butschli. 



Spores more or less fusiform with capsules at each end. Longest diameter along the sutural plane. 



Genus 3. Sphaeromyxa Thelohan. 



Spores fusiform with truncated ends. Capsules opening at the ends. Filaments short and thick; 

 coiled parallel to the longitudinal axis. Trophozoites forming a flattened disk. 



Genus 4. Zschokkella Auerbach. 



Spores when viewed from above semicircular; pointed at the ends. Capsules spherical; situated 

 at ends of spore but opening on the flattened surface. Sutural line curved. 



Genus 5. Myxosoma Thelohan. 



Spores ovoid, flattened, elongated, and pointed at the capsular end. 



Genus 6. Myxoproteus Doflein. 



Spores somewhat pyramidal, with spinous processes from the base of the pyramid. 



Genus 7. Lentospora Plehn. 



Spore lenticular; resembling Myxobolus but without iodinophilous vacuole in the sporoplasm. 



Family 2. CHLDROMYXID.S Thelohan. 



Spores with four capsules. 



Genus i. Chloromyxum Mingazzini. 



With the characters of the family. 



Family 3. MYXOBOLIDjE Thelohan. 



Spores with one or two capsules and with an iodinophilous vacuole in the sporoplasm. 



Genus i. Myxobolus Butschli. 



Spores ovoid, flattened, with one or two capsules. Sporocyst not prolonged into a postcapsular 

 process. 



Genus 2. Henneguya Thelohan. 



Spores ovoid, with one or two median taillike processes at the postcapsular end. 



Genus 3. Hoferellus Berg. 



Spores pyramidal, compressed, with two lateral, taillike processes at the postcapsular end. 



