320 PROFESSOR P. M. DUNCAN ON THE 
The columella is deep and not very large. 
There are four cycles of unequal septa in six systems. 
The pali of the third order are higher than the others. 
The calice is sebpealk 
Height of corallum 3% inch; length of calice 7’ inch. 
The American deep-sea Paracyathi are Paracyathus confertus, Pourtales, rare, in 
50 to 100 fathoms off the Florida reef; and 
Paracyathus de filippi, Duch. et Mich., of the Antilles. 
Division TURBINOLIACES, 
Genus SpuEnotrocuus, Milne-Edwards & Jules Haime, op. cit. 1848. 
SPHENOTROCHUS INTERMEDIUS, Miinster, sp. (Plate XLI. figs. 1-5.) 
MM. Milne-Edwards and Jules Haime distinguish between Sphenotrochus intermedius, 
Miinster, sp., and Sphenotrochus milletanus, Defrance, sp., by writing “cette espéce 
(Sphenotrochus milletanus) est extrémement voisine du Sphenotrochus intermedius: elle 
nous parait n’en différer qu’en ce qu’elle est un peu plus élevée proportionnellement a 
la largeur, et presque aussi épaisse a la base qu’au calice; de plus les cotes sont moins 
saillantes latéralement, et sont plus souvent interrompues” (Hist. Nat. des Corall. vol. ii. 
p. 69). Ido not think this establishes a specific distinction; and it appears to me 
that the form from the British Crag, which was described by Mr. Searles Wood as 
Turbinolia milletiana, and which-was decided to be Sphenotrochus intermedius by 
MM. Milne-Edwards and Jules Haime, is really a variety of the French Falunian form. 
Many specimens resembling the Crag forms have been dredged up in Tangier Bay in 
35 fathoms, and off Cape Sagres in 45 to 50 fathoms. 
Genus SaBinorRrocuus, Duncan. 
The corallum is simple, flatly turbinate, and adherent by a delicate peduncle. ‘The 
calice is flat. The septa are exsert; the coste are delicate and numerous; and the 
columella consists of growths from the septal terminations. 
SABINOTROCHUS APERTUS, Duncan. (Plate XLI. figs. 6-9.) 
The corallum is button-shaped. 
The wall is nearly horizontal, and forms a flat inverted cone, which is marked with 
unequal cost. 
The calicular margin is open and circular, being festooned, however, by the projecting 
primary and secondary septa. 
The fossa is shallow; and the calice, as a whole, is slightly concave. 
There are four cycles of septa in six systems; but occasionally some members of the 
