BULLKTIX 50, rXTTF.D ST ATKS XATIOXAI, MTSEUM. 2(19 



l>ut ilo not t'usi' to it liy tlii'ir inner ciul^; tlicy arc joinod to it, iiowcvcr, liy ."-ynap- 

 ticula. Till' peripheral thickenin",'' of the .septa has been mentioned; from tiii^ /.one 

 thoii' margins fall almost perpendicularly to the hottom of a deep, narrow, ealieular 

 fo.s.sa. Pali are very poorly dc\('lo])ed: four small ones, one before eai'li lateral pair, 

 arc usually present; the dorsal directive may bcai' a weak [laius, likewi.se each one of 

 the miMnhcrsof tiie triplet. The [loorly developed pali is one of the strikin;;- charac- 

 ters of the species. Kach septal mari,''" usually bears 4 or .") inwardly projecting' 

 dentations between the palusand the upper end of the .septmu, but ]>robably there is 

 only out; septal trabci'ula. The palar rinj;' of .synapticula is poorly developed; the 

 spaces between the lateral ])airs fre([ucntly are eritii'cly open, the synapticula present 

 beini^ weak. The openness of the interseptiil loculi within the circle of niural .synap- 

 ticula is very striking. 



The cohimella consists of a single compressed tubercle; it .seems often to connect 

 the dorsal with the ventral directive, but usually' is otherwise free. 



Laealities. — Piikoo. Molokai; depth, 3 to 6 feet; 2 specimens received from W. T. 

 Brigham, i! specimens collected by l)r. J. E. Duerdeu; Waikiki, Oahu. 5 specimens 

 collected by Dr. J. E. Duerden. 



Type. —Cat. No. ;i 1 t>-i5, L' . S. N . M . 



Remarks. — This species is similar to /'. hilmtn in its scjjtal arrangement, but 

 (litters by its more compact mural apparatus, it.s less developed pali. its poorly devel- 

 oped palar ring of .synapticula, and its columella tubercle usually being attached 

 only to the directives. 



The principal variation shown by the suite of specimens is in the configuration 

 of the upper surface. The corallum has an incrusting base; as it grows upward it 

 may be flat topped, as the type, or lobed; it may form stout plates, or crests with 

 rounded edges, or the surface may be glomerate in appearance. Tlie largest S])eci- 

 mens are the size of a man's fist, or .somewhat larger. The calices in some instances 

 may be 2 nun. in diameter, but usually are smaller. The deep, funnel-shaped calices 

 are constant in character. 



9. PORITES LANUGINOSA Studer. 

 Plate I. WWII; I'Uitc I.WWIll, li;;s. 1, 1,(. 

 1901. Poriles latmginoiia Stidkk, Znnl. .laluli.. Svst., \ l„ \i. A'S.i, pi. xxix, tig. 9. 

 Description. — Professor Studer's original descrii)tion is as follows: 



The corallum grow.-.- in heail-shap&l iiia-sseK, and is altaihed by a narrow pedicel; the upper sur- 

 face is uneven, with numerous, prominent, sometimes spherical, sometimes elongated, oompres.scd 

 hlll(jcks. The haliitus is tlierefore similar to that of the jjreceding species [P. (jnelchi], only the 

 hillocks are lower and the whole colony appears more uniforndy rounded. The height is 122 nun., 

 diameter 191 mm., height of hillocks 20 mm., with an average diameter of 27 mm. 



The calice.s are very shallow, however, clearly separated one from another by a very loose, 

 reticular wall, whose component trabecuUe project on the surface as rough spines. There are 12 septa, 

 their margins cxscrt, and small sjiines are on both their edges and their faces; the septa fuse sometimes 

 in pairs, sometimes unite in the bottom of the ealice to form a ring which surrounds the styliform 

 columella. Around the columella are six pali, that can be recognized « ith the naked eye. Diameter 

 of the calices, 1 mm. They are somewhat larger on the hillocks than in the valleys. 

 32301—07 14 



