BULLETIN 59, UNITED STATES NATION.Ai MUSEUM. 153 



species. The greater portion of the outer surface of the wall, beneath the epitheca, 

 is granulate and reticulate. The septal preserve the same general scheme of arrange- 

 ment iis ill the cotypes, except the fourtli cycle is not so much developed and thc^ second 

 cycle remains small. There are very few or no septal perfoi'ations; the septal faces 

 are distinctly striate. The caliculur fossa is moderately deep, 2 mm. and 2.5 mm. in 

 the youngest and the next to the youngest, lespectiveh-. _ The columella is similar to 

 that of the types, except it is looser in texture; not so compact. 



This specimen is, or these three specimens are, interesting because they combine 

 the mural ornamentation of the types of the species and of the variety inxxuiensu 

 next to be described. 



BALANOPHYLLIA DIOMEDE/E var. MAUIENSIS. new variety. 

 I 'late XLV, tifis. ti ti.i. 



Corallum attached by a widely expanded base above which it is constricted and 

 then gradually increases in size toward the calice. Transverse outline of calice 

 broadly elliptical. Greater diameter of calice, !•.. 5 mm.; lesser, 8. .5; greater diameter 

 just above base. 8 mm.; lesser, G.5 miu. ; greatest diameter of basal expansion, 

 15 mm.; height of corallum, 13.5 mm. The thickest portion of the corallum is 

 about 4 mm. below the upper edge of the wall, here the greater diameter is 10.5 mm. ; 

 lesser, 9.5 mm. 



The lower portion of the corallum is covered by a very thin, wrinkled, fragile 

 and easily detachable epitheca, which apparently did not extend very liigli up. There 

 are no vestiges of costre, the outer surface of the wall minutely perforate and finely 

 granulate, the granulations sometimes occurring in definite longitudinal lines along 

 stria'. In other instances the wall seems to be an indefinite, perforated network. 

 The theca is thick, and spongj- in appearance when viewed from al)ove. 



Septal arrangement precisely as in typical B. diomedeif. The fourth cycle 

 is incomplete in four ((uarter systems in the type, the only sp(>cim(Mi. The first 

 cycle is dccidedlj* thicker than the other septa and is slightly exsert, the other septa 

 scarcely exsert. The second cycle usually thicker than those of the two higher 

 cycles. Margins of the first and second cycles entire, those of the other cycles entire 

 or faiiitl}' crenate. The ornamentation of the septa consists of weak, faint striie, 

 with small granulations along them. P^xcepting immediately at the wall, no septal 

 perforations could be discovered. 



Columella precisely the same as in typical />. diomedein. 



Calicular fossa moderately deep, 2.5 mm. from upper end of columella to the 

 summits of the tallest septa. 



Liivality. — Pailolo channel, between Maui and Molokai islands, Station 4101; 

 depth, 122-143 fathoms; bottom, coral sand, shells, foraminifera; temperature, 59.7° 

 F. ; 1 specimen. 



Type.— C-Ai. No. 20826, U.S.N.M. 



Remarks. — This variety is shorter and thicker than the tj'pe specimens of 

 B. d/'ciDedea;, it is entirely without costa', there are no septal perforation except 

 immediately along the line of the wall, and its calice is deeper. 



