114 



above, vermiculate below, equal in size and separated by rather broad, 

 flat intercostal spaces. Epitheca pellicular, smooth, shining. Septa very 

 much thickened at calicular margin exsert, closely and thickly granular. 

 Systems six, cycles four, the fourth rudimentary, though its correspond- 

 ing septa do not differ from the others. Primaries very thick ; second- 

 aries smaller ; tertiaries rather thick, but not reaching more than half 

 ■way to the centre. Pali high, broad, and granular ; probably before all 

 except the last ; yet this is uncertain, as the coral is broken. Columella ? 

 Calice broadly elliptical, not deep. Dimensions — alt. 5, maj. diam. 6, 

 min. 4|. One broken specimen, in which the endotheca could not be 

 well made out ; but its general habit and appearance induces me to refer 

 it to the Astreicke rather than 1 rochocyathus, to which genus it would 

 belong if there were no transverse interseptal dissepiments. 



The next fossil in the collection has remarkable affinities and rela- 

 tions. It is a Conosmilia without an epitheca and simple granular costse, 

 but with a very remarkable columella, which terminates in two con- 

 spicuous round tubercles. This distinction is of generic value, and I 

 propose a new genus for its receptiou. In reference to the peculiar 

 columella, I shall designate it by the name of Bistylia. 



Bistvxia (new genus). 



Simple corals, without epitheca, and a bistyliform columella. 



There are two divisions in the Trochosmiliacese — (1) without any 

 epitheca; (2) with epitheca. This genus belongs to the first, and is 

 associated with Lophosmilia, Parasmilia, Ccelosmilia, having, like all 

 these, scanty endotheca. The first-named, however, has a lamellar 

 columella, the second a spongy one, and the third none. All three are 

 upper mesozoic fossils, with one living Ccelosmilia. Axosmilia is one of 

 the Trochosmiliacese, with a styliform columella, but it has a distinct 

 epitheca. 



Bistylia adherens, n. sp., pi. 1, fig. 5. 



Corallum small, more or less contorted, nearly always adhering by a 

 large portion of its side, cylindrical, suddenly contracting to a point. 

 Costcs small, rounded, granular, continuous, corresponding with septa, 

 and alternating in size with them, broader than intercostal spaces, which 

 have numerous concentric folds, probably the former margins of the 

 corallum. Calice circular, generally a little contracted or bending in. 

 Systems, six. Cycles, three. Septa slightly exsert ; rather thick, granu- 

 lar, prim aries largest, secondaries a trifle smaller, tertiaries half the size, 



