140 RECENT MADKEPOBAIUA oK THE HAWAIIAN ISLANDS AND LAYSAN. 



Type.— Cat. No. 20S84, U.S.N. M. 



Bemarks. — There sire ac-cording to Alcock « 3 speeies oi BatJn/actis that have 

 five (■ompletc cycles of septa, namely: B. slhagte, B. stepJiana, and B. pal if cm, all 

 of Alcock. B. sihogx ditfers from B. .■<yiiniidrica (Pourtales) by having one more 

 cycle of septa, l)y the more delicate texture of its corrallnm. and its greater size, 

 attaining a diameter of tu nnn. B. /ifima/'/t'nsis diflers in form from B. si/ininefrica 

 by the decidcnUy elevated margins of its ])rimary and secondary septa, and B. si/m- 

 metrlca has oidy four cycles of septa. B. t<f,j>Iiiinii, with which I at first identified 

 this species, has a very concave base and still taller septa. Alcock's figure'' indicates 

 another and probably more important difference. In //. ntepliana the septal margins 

 are distally narrow or even excavated, and are elevated near the calicular fossa. As 

 pointed out in the description of B. Jiawaiicmttn,, the i)uter edges of its septal mar- 

 gins descend perpendicularly and connect with the costal ends beyond the limit of 

 the wall. B. paHfern possesses six distinct, thickened pali before the secondary 

 .septa. The paliform lobes of B. hairaileKsis are distinct before some but not all of 

 th(! i)rimary and secondary septa, they are inconstant in development, they are, 

 when present, wider than in />. palifeni, and are not thickened. 



I have recently described another species of Bathijartix.^ B. marenzeUe7'i, col- 

 lected liy the Bureau of Fisheries sie&m&v Albatross at Station 4721, between the 

 Galapagos Islands and Barrett Ridge, at a depth of 2,0S4 fathoms. This species 

 possesses only four cycles of septa, and differs from the Hawaiian species in other 

 notable j)articulars. 



MADREPORARIA PERFORATA. 



Family EUPSAMMID.F: Milne Edwards and Haime. 



Genus STEPH ANOPH YLLIA Michelin. 



STEPHANOPHYLLIA FORMOSISSIMA Moseley. 



I'late XLIV, fig.«. 2, 2a. 



1876. Slcphanuplnilliii foDiiofissima iUtsEhEY, Proe. Roy. Soc, 1876, p. 561. 



18S1. Sle]>li(iiwplnilliit fonnosissiiiia ilosELEY, Deep-Sea Madreporaria, Challenger Rept., p. 201, 



pi. IV, fig. 11; pi. .Mil, figs. 6, 7; pi. .xvi, figs. 8, 9. 

 1902. Stephmwphylliaformosissima Alcock, Deep-Sea Madreporaria, Siboga Exped., ]i. 39. 



A considerable number of specimens of this species were obtained. The only 

 noticeabhi difference from Moseley 's original description is, the Hawaiian specimens 

 are smaller than those obtained by Challenger expedition, the largest measuring 

 27 mm. in diameter. Often, or usually, the first and second cycles of septa are as 

 tall as those of the 3'oiuiger cycles. 



Mo.seley's specimens came from off the Ki Islands, and off Zebu, Philippine 

 Islands. Alcock reports specimens from 4 stations of the Siboga expedition. 



Localities. — 



South coast of Molokai Island: 



Station ;}S:3S; depth, 92-212 fathoms: bottom, fine, gray, brown sand; tempera- 

 ture, 67^ F. ; 3 specimens. 



"Deep-Sea Madreporaria of the Siboga Expedition, p. 37. 

 ''Investigator Deep-Sea Madreporaria, pi, in, fig. .5a. 



