FROM THE UPPER GREENSAND. 19 
Genus—Smitotrocuus, Lad. and H. 
The corallum is simple, straight, cuneiform, free, and without a trace of former 
adhesion. There is no columella. 
The wall is naked and costulate. 
There is no epitheca. 
The simple cost are distinct from the base to the calice. 
This is the simplest form of Aporose Zoantharia, and its structures only comprise a 
wall, septa, and cost. Madellum has an epitheca in addition, and Stylotrochus of De 
Fromentel is a Smilotrochus with a styliform columella, the septa uniting also by their 
thickened internal margins. Onchotrochus, nobis, has a pellicular epitheca, no columella ; 
but, like Stylotrochus, the septa are united internally. 
1. SmrLorrocuus tuBErosus, Hd. and H. 
TROCHOSMILIA TUBEROSA, Ed. and H. 
TURBINOLIA comPRESSA (?), Morris. 
This species, with five cycles of septa, was described in the ‘ Monograph of the Brit. 
Foss. Corals, Upper Greensand,’ Milne-Edwards and Jules Haime. 
2. Smitotrocuus Austent, Hd. and H. Pi. VII, fig. 12. 
This species is thus described in the ‘ Hist. Nat. des Corall.,’ vol. u, p. 71: 
The corallum is regularly cuneiform, very much compressed below, and slightly elongate. 
The calice is elliptical; the summit of the larger axis is rounded. 
Forty-eight costae, subequal, straight, fine, and granular. 
Height of the corallum, about jrd inch. 
Locality. Farringdon. 
MM. Milne-Edwards and Jules Haime do not mention where the specimen is 
deposited. 
3. SmiLoTRocHus ELONGATUS, Duncan. PI. VII, figs. 1—6. 
The corallum is tall, straight, and nearly cylindrical. 
The columellary space is iarge. 
The septa are fine and unequal, especially in length. There are four cycles of septa. 
Height, about an inch. 
