r.fl.LKTIX 50, UXITKD STATES NATIONAL MUSEl'M. I(l8 



Asexual ii'i)rt>ductiuii by gctiuiiulioii liotvvL'oii the caliee.-^ iiiul ai'ouiul tin' inaiyin 

 of the spreadiiiff edoe. 



Locality. — Pulvoo, Molokai; clepth. 'i t(j ti feet: received fidiii W . T. l>ii<;liaiii. 



7}//'-.— Cat. No. L'lt>3L'. r.S.N.M. 



The I'liited States National Museum lias ()l)tained four additiimal si)ecini('ns from 

 the Huerdeu collection of Hawaiian corals, one of them from I'ukoo, Moh)kai. the 

 three others from WaiUiki. Oahu. The salient did'erences between L. ojjaxsizi and 

 L. haivailensis are well >li(i\\n liy the enlarj^ed figures of their respective caliees and 

 are indicated in the synoptic table of the specific chai'acters. The se])ta of the former 

 are more nearly cipial in thickness and arc more crowded, particularly aroiuid the 

 cohunella. which is more developed than in the latter species. Five specimens of each 

 specie-- have l)een carefully comi)ai'ed. and ther(> is no suggestion of intergradation. 



Genus CYPHASTREA Milne Edwards and Haime. 



CYPHASTREA OCELLINA (Dana). 



Plate XXV, tig8. 4, .5, ha, Plate XXYI, fig. 1. 



1S4(>. Aalrica (OrbicfUa) orelliim Dan.\, Zooph. Wilkes Expl. ExpeJ., p. 218, pi. x, tig. 10. 



1850. Cyphaglrea.' ocellinn .\Iilxe Enw.MiDS and Haime, .\nii. Sci. Xat., 3ieme ser., XII, p. ll.">. 



1857. Cijpliastra'af ocellina Milxe Edwards, Hist. Xat. C'orall., II, p. 487. 



1866. Cyphamtrea ocellina Verrill, Proc. Essex Inst., V, p. 37. 



1901. Cijphastrxa ocellina Studer, ZooI. .Jahrb., XL, p. 402, pi. xxx. 



Original deiicripfion. — Dana's original description is as follows: 



Cilomeratc and lebed. uften inonisting; polyps scarcely a line in lireadtli, lamoUa" 24. Ceralluin 

 with the calicles globoso-cylindrical, a,-* in the micTophOiahna, but smaller, with 12 minute lamellae 

 equally exsert; iiiti-istices nearly naked; cells deep: in a transverse section, septa nearly solid and 

 stars few-rayed. 



Professor Dana adds further information in his remarks on the species, and Pro- 

 fessor Studev has published an excellent and very detailed description. Four figures 

 are given in the present memoir. 



The corallum begins growth as an incrustaliou on stones, pieces of dead coral, 

 etc. In some instances there is a projecting free edge, whose lower surface is 

 epitheeate. As growth proceeds the upper surface becomes lobed and glomerate. 

 The larger of the coralla that I have seen are about the size of a man's tist. 



Caliees deep; from 1 to 1.5 mm., or 1.75 mm. in diameter. The calicidar margins 

 may or maj- not be prominent, on the thin incrusting portions of the coralhun they 

 usually are low, on the lobate portions they may project as much as 1.5 mm. The 

 free pcjrtions of the corallites are rather strongly costate: nocosta^ on the intercorallite 

 areas. Both the costsv and the intercorallite areas rather eoar.sely granulate. 



Septa 24 in number. The primhries and secondaries reach the columella and 

 have decidedly exsert margins: llu> former are slightU' thicker and a little more 

 exsert. The tertiaries are thin and ha\e free inner margins. .Vrches of the septal 

 margins microscopically dentate, suijentire; inner margins distinctly dentate, the 

 dentations becoming coarser toward the columella, sometimes simulating pali; septal 

 lamelhe perforate near their inner edges. Septal faces minutely granulated. 

 Endothecal dissepiments abundant, but very delicate. Exotheca composed of thin. 

 vesicular dissepiments that surround the corallites. 



