TABULATE. 



219 



Suborder TABULATE Agassiz. 



Tabulatm Agass. Sill. Journ., XXVI. p. 140. 1858. 

 Corallaria Tabulata Edw. & Haime. Archiv du Mus., V. 

 Madreporaria Tabulata Edw. & Haime. Hist. Corall., IH. p. 223. 

 Tabulate Agass. Cont. Nat. Hist. U. S., IV. p. 292. 1862. 



Family MILLEPORIDiE Agass. 



MILLEPORA Linn. 



Millepora Linn. Syst. Nat. 



Millepora alcicornis Lin. 



Millepora alcicornis LiK. Syst. Nat., X. 1758. 



Millepora alcicornis Dana. U. S. Ex. Exp. Zoophytes, p. 543. 



Millepora alcicornis Edw. & Haime. Hist. Corall., HI. p. 228. 



Millepora alcicornis Agass. Cont. Nat. Hist. U. S., HI. p. 292, PI. 15, Figs. 3-13. 1860. 



Millepora alcicornis Verrill ; in BuU. Mus. Comp. Zodl., p. 59, No. 3. 1864. 



The absence of radiating partitions in the Tabulatse seems to show, 

 without much doubt, that their true place is among the Hydroids. It 

 is true that Professor Agassiz has not observed the Medusae buds on 

 tlie specimens he has figured (Fig. 358), yet the Hydroid character 

 of the animal, and their similarity to Halocharis-hke Hydroids, is very 



strildng. It certainly is not more wonderful to have among Acalephs 

 Hydroids which should deposit hard hmestone parts (Figs. 359, 360), 

 as Millepora and the hke, than it is to find among the Polyps animals 

 in which we find partitions of every stage of hardness, from a gelati- 

 nous or a horny nature, to the most solid deposits of limestone. We 

 have already something of the same diversity in the formation of the 



Fig. 358. Magnified view of extended Hydroids of Millepora. a, a, small Hydroids ; b, larger 

 ones ; m, mouth ; t, tentacles. 



Fig. 359. Branch of I\Iillepora alcicornis ; natural size. 



Fig. 360. Transverse section of branch, a, a, pits of Hydroids. 



