BULLETIN 59, UNITED STATES NATIONAL MUSEUM. 205 



PORITES LOBATA forma CENTRALIS subforma EPSILON, new. 

 Plate XCVI, lifiH. 1, •_', ?,. 



A fragincnt of u curallimi. will l)e descrilx'd tir->l. iuhI tlicii u six-ond specimen 

 will bo coinpiircd with it. 



Tiie corulluin consists of usceiulinu' lotios, with Mianiniillutc surfaces and obtuse 

 ends. Depth of livinjr portion, 100 mm.; width of two lobes, To mm.; width of 

 upper ends of lobes, 27 to 30 mm.; thickness just below ends, 9 to 13 mm. The 

 lower broken portion shows successive overlapjiinij;' layers, at least three of which 

 can be seen, the under surfaces epithecate, edires flarinjr out. TIk^ jri'owth alonjf the 

 axes of the lobes is continuous. 



The calices are deep, poly o-onal. from 1.25 to 1.75 nun. in diameter, mareined by 

 straiijht walls varying' in height, but always forming bounding ridges. The mural 

 denticles are somewhat compressed perpendicular to the wall ])lane, gramdate, 

 slightly ragged, but still of fairly uniform si/.e. 



The upper ends of the septa are usually narrow, luit sometimes have more or 

 less ))late-like comiections with the nuiral denticles. Hetween a ])alus and the wall is 

 one septal traliecula. the trai)ecuhe joined bj* a constantly present ring of synapticula, 

 which reach higher up in the talice than the tops of the i)ali, and may be fused with 

 the wall or are separate from it. The wall is fre(|ueiit ly distinctly trinuirate. The 

 septal graiudes are indillerently developed, never j)romiiient, and often not distinct. 

 There are often several rather small denticles on a septal margin, one or two pro- 

 je<'ting from the mural, the others from the septal trabivula. In some cases the 

 septal granule is represented by a thin j)late, detaclievl from the wall, and situated on 

 the inner edge of the sjMiapticular ring. Septal faces with a few small granulations; 

 interseptal loeuli open. 



The pali are poorly developed. They are small, low, rounded knobs on the 

 inner ends of the septa. The fornuda is sometimes complete, but there is often none 

 on the dorsal direction, anfl usually none on one or more members of the triplet. 



A compressed columella tubercle may or may not be present; columella tangle 

 rather large, of loose or rather compact texture. 



The calicular characters of the second spfM'imen are so similar to those of the 

 first that they need no additional tlescription, but its habitus deserves notice. 

 The base of the corallum is incrusting. over dead I'uritix. (ireater diameter of 

 base, 115 ram.; lesser, 7o nun.; height, ln2 nun. The up])cr surface is thrown into 

 lobes, or rises into stiun[)y protid)erances. wliicli may be 2o nun. tall, with a greater 

 diameter of 20 mm.; lesser. 16 mm. The stumpy elevations of the upper surface 

 are the features to which it was desired to call attention. 



Locality. — Pukoo, Molokai, W. T. Hrigham: Waikiki and Kaneohe, Oahu, 

 J. E. Duerden, collector. 



Type.— Oi.t. No. 22238, U.S.N.M., received from Dr. W. T. Hrigham. 



Pamtypex.-'l'l-im, 22678, collected l)y Di-. J. E. Duerden. 



The following is a detailed description of another specimen belonging to this 

 subforma (Plate XC\T, Hgs. 1, 2, 3. Cat. No. 22()7S): 



The specimen, which has been broken from a larger corallum. is composed of 

 lobes and crests solidly fused in theii- lowei' ])ortion. (^n the sides ai-e longitudinal 



