120 PAPERS FROM THE DEPARTMENT OF MARINE BIOLOGY. 



Septa, 14 to 15 to centimeter, usually equal, occasional intermediate rudimentary septa. 

 Margins steeply or broadly arched over the wall summits, falling steeply or perpendicularly 

 to bottoms of valleys. Septal dentations well developed, senate. Columella trabecular. 



Station, Murray Island.— Southeast reef, line I, 1,600 feet from shore. 



In my opinion Dana's Meandrina rustica from Wake Island is the same as 

 M. lamellina Ehrenberg. Klunzinger has elaborately described the variation of 

 this species. There are in the U. S. National Museum good suites of specimens from 

 Djibouti (French Somaliland), received through Dr. Charles Gravier, and from the 

 southern Philippines, J. B. Steere, collector. The Murray Island specimen is some- 

 what denser than those from the other localities, and the collines average lower. 



Distribution— Red. Sea; Indian Ocean; Murray Island, Australia; southern 

 Philippine Islands; Samoa; Wake Island. An excellent specimen collected by 

 Mr. Carl Elschner at Fanning Island is in the U. S. National Museum. The species 

 therefore extends from the east coast of Africa to Fanning Island. 



Masandra astreiformis (Milne Edwards and Haime). 

 Plate 14, figure 19, of Dr. Mayer's article. 



1849. Aslroria astreiformis Milne Edwards and Haime, Ann. Sci. nat., 3d ser., Zool., vol. II, p. 299. 



1850. Cceloria astraiformis Milne Edwards and Haime, Hist. nat. Corall., vol. 2, p. 417. 

 1899. Cceloria astraiformis Gardiner, Proc. Zool. Soc. London for 1899, p. 743, plate 46, fig. 4. 



Description of a specimen from Murray Island: 



Corallum incrusting, rounded above, about 4 cm. long and 5 cm. wide. 



Valleys from 6 to 9 mm. long; 5 mm. wide. Not more than 2 calicinal centers in a valley. 

 Walls usually with a sharp edge, but thickened below, where they are up to 2 mm. wide. 

 Depth of valleys up to 4.5 mm. _ 



Septa average about I mm. apart, usually no rudimentanes; exsert up to a little more 

 than I mm.; upper edges flattened; inner edges perpendicular or overhanging, raggedly 

 dentate. 



Columella poorly developed, trabecular. 



Station, Murray Island.— Southeast reef, line I, 1,620 to 1,670 feet from shore; 

 water 15 inches deep at lowest tides; hard, rocky bottom. 



It seems to me that Cceloria astreiformis and esperi of Milne Edwards and 

 Haime must be the same species, as the only definite difference is in the thickness of 

 the walls, which may range from a perforate membrane up to 2 mm. in thickness, 

 as in the Murray Island specimen. 



Distribution.— The species ranges from the Red Sea eastward to Wakaya, Fiji 

 Islands. 



Maeandra stricta (Milne Edwards and Haime). 

 Plate 45, figures }, 3a specimen from Murray Island. 

 1857. Cceloria stricta Milne Edward; and Haime, Hist. nat. Corall. vol. 2, p. 417. 



The following is a description of a specimen of this species from Murray Island : 



Corallum with flattish upper surface, apparently incrusting. 



Corallites polygonal. Walls of adjacent corallites applied one to the other, fused, or 

 more or less imperfect. Thickness from about 0.5 to nearly 1 mm. Ends of septa in the 

 walls often hollow, probably a pathologic character. 



Calices, maximum length about 7 mm.; width 3.5 to 4.5 mm., depth, 2.5 to 3 mm. 



Septa, 6 or 7 to 5 mm., less than 1 mm. apart, subequal at the wall. In a calice 6 mm. 

 long by 4.5 mm. wide, n reach the columella; 3 fuse to the sides of larger septa near the colu- 

 mella; and 7 smaller septa, one of them rudimentary, have free edges, total number 21. 

 Edges scarcely or not at all exsert; those of the longer septa flattened or gently sloping from 

 the wall to near the columellar region, where they are perpendicular; smaller septa narrower 

 and slope steeply. Margins irregularly but rather finely dentate. No pali. Very fine granu- 

 lations on the septal taces. 



