TABULATiE. 



219 



Suborder TABULATE Agassiz. 



TahulaUc A<;ass. Sill. Joiini., XXVI. p. 140. 1858. 

 Corallnria Tuhnliita Edw. & 1I.\imk. Aniiiv du Mus., V. 

 Muilrcporarid Tabulntu Edw. & IIaimk. Hist. Coral!., HI. p. 116. 18G0. 

 Tabulatce Agass. Cunt. Nat. Hi.st. U. S., IV. p. '2!i2. l.S(J2. 



Family MILLEPORIDiE Agass. 

 MILLEPORA Linn. 



Mlllepora Linn. Syst. Nat. 



Millepora alcicornis Lm 



Millcpora alcicornis Lix. Syst. Nat., X. 1758. 



Millepora alcicornis D.A.XA. U. S. Ex. Exp. Zoophytes, p. 543. 



Millepora alcicornis Edw. & IIaimk. 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 Bull. Mus. Comp. Zool., p. 59, No. 3. 1864. 



The absence of mdiating partitions in the Tabulata} seems to show, 

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

 is true that Professor Agassiz has not observed the Medusa) buds on 

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

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



Fig. 359. 



^f 



Fig. 360. 



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

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

 as Millepora and the like, 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 ; /, tentacles. 



Fig. 359. Branch of jNIillepora alcicornis ; natural size. 



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



