8 BRITISH FOSSIL CORALS 
Genus—J'ROCHOSMILIA. 
Sub-genus—CCLOsMILIA. 
1. Trocnosmin1a (Cenosminia) vaxa, Ed. & H. Pi. Ill, figs. 11—17; PL IV, figs. 
9—12. 
In examining good specimens of this species I found the fourth cycle of septa to 
be present. Its laminz are small, but decidedly visible. Consequently the calice as 
drawn by MM. Milne-Edwards and Jules Haime (‘ Monog. Brit. Foss. Corals,’ P. I, Pl. 
VIII, fig. 4c) is incorrect. ‘The following description will apply to three varieties of the 
species. 
Variety 1—The corallum is conico-cylindrical and straight. 
The costz are intensely granular inferiorly, and two large coste are separated by 
three smaller. Near the calice the larger costa have a wavy cristiform ridge upon them, 
the intermediate costz being very granular, with chevron patterns, or they may be moni- 
liform. At the calicular margin the coste are nearly flat and granular. The fourth cycle 
of septa is distinct. 
Variety 2.—Inferiorly in structure as variety 1. Superiorly the principal cost are 
very cristiform, and well marked with a secondary ridge. The chevron markings of the 
intermediate coste are very distinct. 
Variely 3.—Coste inferiorly wavy and sparely granular. Superiorly the coste are 
subcristiform and plain, the continuity of the crests being defective. The interme- 
diate costze are broken and moniliform, and here and there chevroned. 
Localities.—Norwich Chalk; Wiltshire Chalk. In the British Museum and in the 
Salisbury Museum. 
2. 'TRocHOsMILIA (C@LOSMILIA) corNnucoPia, Duncan. PI. III, figs. 6—10. 
The corallum is strongly curved in the plane of the smaller axis, and it is compressed 
superiorly, and is finely pedunculate. The growth rings and swellings are moderately — 
developed. 
The costa are subequal above, and cristate and unequal inferiorly. 
The septa are numerous and very unequal. ‘There are five cycles of septa and six 
systems. he primary septa are very exsert, and the secondary are less so. The septa 
of the fifth cycle are very small. 
