202 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



cycles, wbicli are equal in proraineuce. The septa are distant, thio, 

 weak, aud show no marked thickening at the wall. 



Pali are before every cycle of sejita. Those before the first cycle 

 are the broadest. The pali belonging to each septal gronp included 

 between the members of the first cycle are deltoid in arrangement. 

 The arrangement is well shown in Plate XVI, fig. 6. The pali are 

 broad and are simple lobes, excepting usually there is an inner tooth 

 before the delta composed of the pali of each group of septa of the 

 third and fourth cycles. The margins ofthe])aU are entire. The trabec- 

 ular make-up of the pali is the same as that of the septa ; each palus 

 has its own line of divergence, etc. The fusion of the septa into deltas 

 through the pali is effected usually by synapticula. Excepting these 

 synapticula the interseptal loculi are entirely vacant. 



Some hints have already been thrown out as to the make-up of the 

 wall. It is entirely naked, imperforate, and rather thin, thickening 

 very little from internal calcareous deposit; no processes extending 

 inward from it between the septa (such as are quite common in some 

 Turbinolid genera) were seen. As the septa and costte do not thicken 

 in crossing the wall, this coral would be said to possess a eutlieca. In 

 my mind the point to be emphasized is that the septa are distant and 

 thin, and the connecting wall is also thin. The wall between the costse 

 possesses no ornamentation. 



The columella is large, well-developed, trabecular, and spongy. 



Locality. — Boshiu (=Awa), eastern coast of Japan. 



Tyj^e.— Cat. ^o. 19391, U.S.KM. 



Batliy metric distrihution, not known. 



Remarlis. — The natural group to which this coral belongs is very 

 evident. It is very closely related to TrocJiocyathus and Deltocyathus. 

 It is separated from the latter genus solely by possessing one more 

 crown of pali. The genus Leptocyathus Milne-Edwards and Haime, 

 was founded to receive the coral from the London Clay, designated by 

 them Leptocyathus elegans,^ which, according to them, possesses dentic- 

 ulate i^ali before all cycles of the septa. The pali of Ljeptocyathns, 

 according to the figure (Plate III, fig. 6c), are small, and do not exhibit 

 a noticeably deltoid arrangement. There are other differences; the 

 septa are much thickened at the wall, and the costte possess very broad 

 bases. Pourtales^ has described a species, found off Conch Eeef and 

 Tennessee Reef, Florida waters, as Leptocyathus stimpsoni. I doubt if 

 this coral is really a Leptocyathus. It possesses many points of differ- 

 ence from the type species L. elegans, and certainly is not closely related 

 to the species here described. 



It may be repeated that Levipalifer is most closely related to 

 Deltocyathus. 



'Monograiih Brit. Foss. Corals, PaleontograpTi. Soc, 1850, pp. xiv, 21, 22, pi. in. 

 figs. 6, 6a-c. 



nil. Cat. Mus. Coiiip. Zool., No. IV (Deep Sea Corals), 1871, p. 12, pi. in, iigs. 

 1-3. 



