BULLETIN 59, UNITED STATES NATIONAL MUSEUM. 



151 



their inner nuuiriiis may I'li.-^e of uiaj' be merely close together. From each .septal 

 jrroup there i.s a jjrolonyation to the columella; occasionally both .septa of the fourth 

 cycle may reacli the cohiniclia. Tiie upper niai'ginsof the lirst and second cycle.s are 

 equal in prominence and exsert; those of the third cycle the least exsert, while those 

 of the fourth reach a level halfway between that attained by the third and the first 

 two cycles. The edj^es of the septa are entire, e.vcept near the coliunella there may 

 be some irreguhir dentations. Inner portions of the septal faces minutel3' striate and 

 granulate. Interseptal loculi in the ba.sal portion filling solidly with stereoplasm. 



Calicular fossa elongate, rather large, moderately deep. 



Columella well developed, compressed, vesiculate. i)rojecting in the bottom of 

 the bottom of the fossa. 



Locdlity. — Vicinity of Laysan, Station :i987; depth, 130-148 fathoms; bottom, 

 white sand, small shells; temperature, 63- F. ; 1 specimen. 



Type. -Out. No. 20901, U.S.N.M. 



BALANOPHYLLIA DIOIVIEDEiE, new species. 

 I'late XLV, W^^i^. :',, 4, An, b. 



Corallum attached by a ratlier wide base, ratiier elongate, increasing in diameter 

 ver\' slowly, cross section bioadly elliptical or almost ciicular. 



Measurenicnls. 



Specimen No. 2 is rather sharply constricted immediately above the base. About 

 midway between the base and the calice it has a greater diameter of 8 mm. and a 

 lesser of 7.5 mm. 



There is always some epitheca on the ba.sal portion of the corallum. It is thin, 

 incomplete, and usually extends about half way up the wall. The wall is thick and 

 vesiculate. Costa; indistinct, low. Hat, etjual, intercostal furrows narrow and shal- 

 low, both costie and furrows with numerous perforations. Where cost* can be dis- 

 tinguished, the whole surface shows numerous perforations. 



Septa usually in four complete cycles; occasionally some members of the fourth 

 are lacking in a quarter .system. The first cycle decidi^dly tliicker than the other 

 septa, the.se extend directly to the columella and take no part in the septal groups. 

 The septa of the fourth cycle standing next the first in any .system, or those of the 

 third, when the fourth is incomplete, bend awaj' from the first and toward the 

 included septum of the second cycle, often meeting in front of it and inclosing it. 

 The members of the fourth cycle, standing next the niemlier of the second cyi le in 

 any system, bend away from the second, around the ends of the members of the third 



