EEPORT ON THE TETRACTINELLIDA. 
clv 
Genus 1. Corallistes, 0. Schmidt. 
Corallistes, O. Schmidt, Spong. Atlant. Gehiet., p. 22, 1870. 
„ Zittel, Ahhandl. d. k. haier. Akad. d. Wiss., Bd. i. p. 120, 1878. 
Corallistidse in which the ectosomal spicule is a dichotrisene, and the microsclere a 
spiraster. The pores and oscules are simple. 
Type — Corallistes typus, 0. Schmidt (p. 301). 
Genus 2. Macandrewia, Gray. 
Macandrewia, Gray, Proc. Zool. Soc. Bond., p. 438, 1859. 
Dactylocalyx (jpars), Bowerhank, Proc. Zool. Soc. Bond., p. 86, 1869. 
Macandreioia, Carter, Ann. and Mag. Nat. Hist., ser. 4, vol. xii. pp. 438, 441, 1873. 
Corallistidse in which the epirabd of the desma is smooth, zygosis is chiefly terminal ; 
the ectosomal spicules are phyllotrisenes, and the microsclere a microrabd. The pores and 
oscules are simple. 
Type — Macandreivia azorica, Gray (p. 340). 
Genus 3. Dsedalopelta, n. gen. 
Corallistidse in which the desma and discotrisene are similar to those of Macandrewia 
but the microscleres are spirasters. 
Type — Dsedalopelta nodosa (0. Schmidt) (p. 342). 
Genus 4. Heterophymia, Pomel. 
HeteropJiymia, Pomel, Pal. de I’Oran, p. 143, 1872. 
„ Zittel, Ahhandl. d. k. haier. Akad. d. Wiss., Bd. i. p. 121, 1878. 
Dactylocalyx (p-p-), Bowerhank, Proc. Zool. Soc. Bond., p. 85, 1869. 
Corallistidse with separate poriferous and oscular surfaces which are distinguished by 
different ectosomal spicules, dichotrisenes occurring on the poriferous, and small, smooth, 
irregularly branched desmas on the oscular surface. 
Type — Heterophymia heteroformis (Bowerhank) (p. 343). 
Genus 5. Callipelta, n. gen. 
Corallistidse in which the ectosomal spicule has the form of a discotrisene, but the 
axis of a rhabdus. The microsclere is an amphiaster. 
Type — Callipelta ornata, n, sp. (p. 309). 
