482 MR. H. N. MOSELEY ON THE STRUCTURE OP THE STYLASTERID2E. 
(IX.) Genus Cryptohelia, M. Ed. and H., l.c., p. 127. 
Species 1 . Cryptohelia pudicci, M. Ed. ancl H., Ann. des Sci. Nat. 3 ser., t. xiii., 
fig. 3, pi. 3, fig. 1, 1850 ; = Endohelia Japonica (?), M. Ed. and H., 
Hist. Nat. des Cor., t. ii., p. 128, of which no figure is extant. 
New Guinea, Japan, Atlantic, West Indies, S. Pacific, Japan, 
390 to 1,530 fathoms, ‘Challenger;’ Moseley, Proc. Hoy. Soc., 
No. 170, 1876, p. 548. 
Species 2. Cryptohelia Peircei, Pourtales, c Deep Sea Corals,’ l.c., p. 37, pi. ii., 
figs. 18 and 19. Off Havana, &c., 270 to 600 fathoms. = C. 
pudica (?). 
(X.) Genus Distichopora, Lamarck, Hist, des Anim. sans Vert., t. ii., p. 198. 
Species 1 . Distichopora violacea, M. Ed. and H., Hist. Nat. des Cor., t. iii. 
p. 451 ; M. Edwards, ‘Atlas Regne Animal, Zoophytes,’ pi. 85, 
fig. 4, 4 a, 45, 4c. Island of Timor ; Fiji. 
Species 2. Distichopora coccinea, Gray, Proc. Zool. Soc., 1860. Abundant at 
the Marshall Group, Pacific Ocean. 
Species 3. Distichopora nitida, Verrill, Bull. Mus. Comp. Zool. Cambridge, 
i., p. 46. 
Species 4. Distichopora cervina, Pourtales, ‘Deep Sea Corals,’ p. 39, note; 
111. Cat. Mus. Comp. Zool. Harvard, No. 8, pi. vii., fig. 11. 
St. Thomas, Danish West Indies. 
Distichopora foliacea, Pourtales, ‘Deep Sea Corals,’ p. 38, pi. iv., figs. 12, 13. 
Off Florida and Key West, 100 to 262 fathoms. 
Species 6. Distichopora sulcata, Pourtales, ‘Deep Sea Corals,’ p. 38, pi. iv., 
fig. 14, pi. vii., fig. 7. Off Havana, 270 fathoms; off Cuba. 
Species 7. Distichopora barbadensis, Pourtales, 111. Cat. Mus. Comp. Zool. 
Harvard, No. 8, p. 43, pi. vii., fig. 10. 
Species 8. Distichopora rosea, Kent, Proc. Zool. Soc., 1871. East coast of 
Australia. 
Species 9. Distichopora antiqua, Defrance ; M. Ed. and H., Hist. Nat. des Cor., 
t. iii., pp. 451, 452. Tertiary fossil at Chaumont and Valmondois. 
Pedigree of the Hydrocorallina:. 
The line of descent of the various genera of the Stylasteridse from a parent form 
seems to be traceable with especial clearness. All gradations are present by which 
simple circular mouthed pores sporadically scattered over the corallum become grouped 
and modified into cyclo-systems of the most symmetrical and complex character. 
Since styles appear in some genera in the dactylopores as well as in the gastropores, it 
seems probable that in the ancestral form or Archistylaster styles were present in both 
forms of pores. If the Milleporidee prove closely related to tlie Stylasteridse when 
