828 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxx. 



The base, besides possessing corrugations, has seV' eral deep sinuses, 

 and numerous fine, not prominent, granulated costfe, which usually 

 alternate rather regularly in size, and correspond to all septa. Toward 

 the central portion of the base they are resolved into a great number 

 of granulations without apparent definite arrangement. The wall over 

 the greater portion of the base appears solid, but rather often near the 

 peripherj' synapticula ma}^ be seen joining the septa together. In 

 places the wall is clearly synapticulate. The appearance is that the 

 wall is at first synapticulate and later becomes secondarily^ thickened 

 so as to be imperforate almost throughout. 



The septa are extremely numerous, thin, and very much crowded, at 

 the edge of the corallum equal or subequal, above the edge and near 

 the fossa unequal. In specimen No. 1 there are ten or twelve larger 

 septa, with about twenty or more smaller interv'ening septa. The 

 cycles are not distinctly differentiated, but apparently the arrange- 

 ment is between six and seven cj^cles, with the members of the first 

 and second cycles of the same size. Those of the third cycle are 

 shorter; those of the fourth are shorter than those of the third. The 

 members of the fifth cycle are shorter than those of the fourth. In 

 places it could l)e seen that the two outer septa of the sixth cycle in a 

 ([uarter system (that is, a septum of the sixth cycle standing next to 

 the one of the first cycle and the one next the member of the third 

 cycle in the same quarter S3'stem) are prolonged beyond the imier end 

 of the included member of the fourth cycle and equal in length the 

 member of the third cycle. The members of the sixth C3xle seem 

 always to be longer than those of the fifth. The seventh cycle is not 

 complete; they appear to be short, hut often it does not seem possible 

 to distinguish ])etwcen the members of the sixth and seventh cycles, 

 so that sometimes an outer septum of the seventh ma3" be prolonged 

 and combined with one of the sixth for the inclusion of one of the 

 fifth. 



The septal margins are very finely dentate. Laterally the septa are 

 striate, the stria' usually opposed in pairs, with granulations arrangcnl 

 along their courses. P^ach dentation on the septal margins corresponds 

 in position to the termination of a pair of strife. Septal perforations 

 are numerous in the younger septa, especially near the margin; they 

 occur between and sometimes in the courses of the septal trabecuhe, 

 and are not perfectly regular in occurrence. The older septa, except 

 near the margin and inner termination, are usually imperforate. 



Thecalicular fossa is deep, extending almost to the base of the coral- 

 lum, and is narrow. There is no columella. A considerable number 

 of septa meet in the bottom of the fossa. 



Locality. — Toshibetzt Valley, Yesso, rFapan. K. Pumpeliy, col- 

 lector. 



Geologic Iidi'lzon. — Tertiarv; nothing more definite known. 



Tf/pc—Oxt. No. 154^26, U.S.N.M. 



