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HILL: GEOLOGY OF JAMAICA. 239 
crown surrounding the columellar termination, The upper end of the col umella 
is in a depression surrounded above by the crown. These swollen ends of the 
septa sometimes fuse laterally with one another. The sides of the septa are beset 
with crowded pointed granules. Endothecal dissepiments very abundant ; in 
the cross section of one interseptal loculus seven were counted ; usually at least 
three are present in each cross section of the loculi. The dissepiments are thin. 
Locality. Craigie, Parish of Hanover, 
Type. Collection of Institute of Jamaica, Kingston, Jamaica. 
DIPLORIA, EDWARDS AND Har, 
In examining the literature on Diploria 1 find that certain of its features are 
so vaguely described that one is likely to fail to recognize the genus. In 
characterizing the genus Edwards and Haime state, “la columelle est spon- 
gieuse, essentielle et bien développée."! Duncan's description of the columella 
in his “Revision of the Families and Genera of the Madreporaria,” ? is merely 
a translation of the original French. In examining specimens of the species of 
Diploria herein described, of D. crassolamellosa, Edwards and Haime, and from 
figures of D. floxuosissima, d? Achiardi, the persistent presence of a lamellar 
columella was noticed. 
In the first characterization of Diploria,® only jo Meandrina cerebriformis 
of Lamarck is mentioned, so this species, the common Diploria cerebriformis of 
the West Indies, is the type of the genus. A study of this species has shown 
that it possesses a lamellar columella, which is given a spongy appearance in 
places by the inner termini of some septa fusing to it and sending out some 
processes in the axial space, The columella is not continuous throughout the 
whole length of a series, but is broken here and there by what probably are 
calicinal centres. A section of one series parallel to the septal planes showed a 
perfectly distinet lamellar columella through a vertical distance of 1 cm. 
This was the length of the section. 
The usual definition of Diploria must be modified so as to include the obser- 
vations above noted. 
Diploria conferticostata, sp. nov. 
Plato XXXIX. Figs. 1-3. 
1365. Diploria crassolamellosa, Duncan (non Edwards and Haime) Quart. Jour. 
Geol. Soc. London, Vol. XXI. pp. 7, 12. 
1808. Diploria crassolamellosa, Duncan, Quart. Jour. Geol. Soc. London, Vol. XXIV. 
p. 24. 
1 Hist. Naturelle des Coralliaires, 1857, Tom. II. p. 401. 
2 Journ. of the Linn. Soc. (Zoöl.), 1884, Vol. XVIII. p. 88. 
8 Comptes Rendus de l'Acad. des Sc. (Paris), 1848, Tom. XXVII. p. 493. 
