DBSCRIPTiONS OF SPECIES. 179 



extremely tliiu, with faces covered with numerous small, pointed grains. Those of 

 the last cycle fuse at about two-thirds the length of the neighboring septa. Height, 

 25 mm.; longer axis of the calice, 19; shorter, 16; the approximate proportion, 

 100:118. Fossil from Alabama. Collection of Alcide d'Orbigiiy. Tiie general form 

 of the single specimen we have seen differs very little from that of iJ. trochiformis, but 

 the base is feebly curved in the plane of the shorter axis of the calice. 



PI. XX, figs. 21, 21a, are two views drawn from photographs of the 

 type specimen and kindly furnished by Prof Aljjhonse Milne-Edwards. 

 When in Paris, in January, 1898, tlu-ough the courtesy of M. Boule, of the 

 Collection Paleontologique, I had the opportunity to examine this specimen 

 and several others that Milne-Edwards and Haime had. The type specimen 

 is the most abnormal specimen of the s^jecies that I have seen ; it repre- 

 sents the extreme of elongation of the species. PI. XX, fig. 22, represents 

 a specimen intermediate in character between the type and the usual form. 

 There is a second specimen in the Collection Paleontologique that presents 

 the ordinary characters. 



The species is transferred to the genus Balanophyllia because the speci- 

 mens always show a distinct and often fairly large scar of attachment. 

 Some specimens may become free, but others evidently are permanently 

 attached during the life of the animal. Usually there is a thin pellicular 

 epitheca over the lower portion of the corallum. These two characters are 

 the essential ones by which Balanoi)hyllia is differentiated from Eupsammia. 



The following is a characterization of the usual form of the species: 



Corallum compressed, conical, rather short; cross section broadly ellip- 

 tical, usually curved in the plane of the shorter transverse axis of the calice, 

 occasionally in the plane of the longer transverse axis. 



All of the specimens examined show indications of attachment on the 

 base. Costse usualh^ broad and flat, except at their origin, when they are 

 composed of a single row of granules, in the wide portion composed of a 

 double, sometimes treble, set of granules arranged transversely, jierforated. 

 Intercostal furrows very small, perforated. Base of the corallum usually 

 covered by a thin pellicle of epitheca. Wall thick, vesiculated, perforated. 

 Columella very vesicular. Septa thin, in five cycles, with usual Eupsammid 

 grouping, their surfaces covered with granules. 



