FOSSIL CORALS FROM WEST INDIES WELLS 91 



Vaiighan (1899), after repeating Duncan's original description, 

 adds : 



The usual number of cycles of septa is three; the arrangemeut into cycles 

 does not appear perfectly regular and unifonn, so Duncan's figures must be used 

 •with a qualification. In the best preserved portions there Is no granulate 

 area on the summit of the wall between the ends of the septa. Apparently 

 the upper edge of the wall is acute in perfect material. Diameter of the calices 

 2.5 to 4 mm ; the usual diameter is slightly less than 3 mm. The specimen 

 does not permit the details of the pali ( ?) to be made out. It seems quite 

 proliablo that the species is a Litharaea, and not Pontes. 



Bernard in his discussion (1906) adds practically nothing to our 

 knowledge of this species, but questions whether the supposed type 

 in the Museum of the Geological Society of London is the same as 

 the specimen figured and described by Duncan in 1865, adding (p. 

 160) : " There is not a character in the drawing [Duncan's] which 

 agrees in the remotest with the calices of the specimen." 



Details regarding the structure of this species can now be added 

 from tlie well-preserved specimen in the Trechmann collection. The 

 walls between the calices, where they are acute, are marked by a 

 single row of granulations, but where there is some separation, the 

 walls are rounded and may have 2 to 4 rows of granules. The septa 

 are almost always 20 in number, arranged in a modification of the 

 ty])ical septal formula of the recent members of the genus that have 

 "24 septa, as it is given by Bernard (1903, p. 21) ; this is best ex- 

 plained by plate 5, figures 4 and 5, representing the formulas of 

 recent Goriiopora and G. reussiana. There are three trabecular ele- 

 ments between the wall and a palus. There are five tubercular pali. 

 The columella consists of a single tubercle surrounded below the 

 floor of the calice by a ring of synapticulae uniting the palar tra- 

 beculae. The under surface of the corallum, where exposed by the 

 superposed, laminar growth layers, is covered by a thin epitheca. 



Measurements. — The diameters of the branches of the specimen 

 are 12 by 15, 11 by 13, and 11 by 15 mm. 



GONIOPORA TRECHMANNI, new speci€i 

 Platk 3, FiGXJBES 16, 17 



Desa^ptlon.. — Corallum massive, with a flat or concave base, grow- 

 ing upward by the addition of superimposed layers into a hemi- 

 spherical or subspherical mass. The corallites average 1.8 mm in 

 diameter and are embedded in a porous reticulate coenenchyme 0.5 

 to 1.5 mm apart. There is no definite corallite wall, and the outer 

 ends of the septa merge with the coenenchyme. The calices are 

 polygonal in outline, of moderate depth, bounded by a rounded 

 reticular intercalicular ridge. The septa are well developed, always 



