| OCR Text |
Show 187L] MR. W. S. KENT ON N E W MADREPORES. 283 of the polype-cells, and in miniature they bear a certain resemblance to the nariform calices of various species of Madrepora ; their true relationship, however, is probably identical with the many-patterned intercalicinal developments peculiar to the genera Montipora and Styloccenia. Subfamily S T Y L O P H O R I N _ E. PENTALOPHORA, n. gen. Reussia, Michelotti, M e m . sur les Corall. des Antilles, p. 63, 1860. This new generic name is proposed in substitution for that of Reussia, in consequence of the latter having been used by Presl in 1838 to distinguish a genus of fossil ferns. The single species referable to this genus, Reussia lamellosa (Mich.), is remarkable for its septal system being composed of a multiple of five, each calice being furnished with ten evenly developed septa, which are united internally to the stylate columella. The constant quintuple arrangement of the septal elements isolates this form from all known Madreporaria; in other respects it is closely allied to the genus Stylopora. Family ASTREID_E. T R I D A C O P H Y L L I A ALCICORNIS, n. sp. (Plate XXIII. fig. 4.) Corallum slender, elevated ; margins of thecae produced into elk-horn- like prolongations. Columella absent. Septa forming three or four cycles, their internal edge dentate or lacinate, their lateral surfaces granulate. Costae prominent, echinate. Epitheca rudimentary ; en-dothecal dissepiments little developed. Hab. San Cristoval, Solomon Islands. B.M. This species differs from those previously described in the branching instead of foliaceous character of the walls of the thecae. TRIDACOPHYLLIA ECHINATA, n. sp. (Plate XXIII. fig. 3.) Corallum infundibuliform, foliaceous ; margins of thecae bidentate, little elevated. Columella moderately developed, trabecular. Septa forming four or five cycles ; the primaries and secondaries prominent and equally developed, having their internal edge remarkably thickened, coarsely tuberculate and echinate ; the remaining septa little developed, denticulate or slightly echinate. Costae not prominent, almost even, finely granulate. Epitheca moderately developed. Endothecal dissepiments of large size at the base of the corallum. Hab. San Cristoval, Solomon Islands. B.M. This species is at once recognized by the anomalous character of the primary and secondary septa. OXYPORA*, gen. nov. This name is proposed in place of Trachypora of A. E. Verrill * ogt's, sharp, cutting. |
