88 PAPERS FROM THE DEPARTMENT OF MARINE BIOLOGY. 



Solenastrea bournoni Milne Edwards and Haime is not a synonym of C. chal- 

 cidicum, as is stated by Matthai; in fact, they are not even closely related. I 

 studied the cotypes of the former while in Paris and subsequently Dr. Charles Gravier 

 kindly sent me four photographs of them: two general views, natural size; two ot the 

 calices X4; and one of the longitudinal section X4. This is a West Indian species, 

 which is closely related to Solenastrea hyad.es (Dana). Neither of these species 

 has sharp, clear-cut costae around the calices, and the intercorallites areas are 

 almost without ornamentation, except that in some instances there may be low, 

 rounded, rather flexuous costal markings. The calices of S. bournoni are smaller 

 than in S. hyades, and in the former the inner margins of the tertiary septa are 

 normally free, while in the latter they usually fuse to the sides of the included 

 secondary septum. As these species do not occur in the Pacific Ocean they wdl 

 not be further discussed here, but I will say I have descriptions of them in my 

 unpublished manuscript on the fossil corals of the southeastern United States 

 and the West Indies and that figures have already been prepared. 1 



Cyphastrea microphthalma (Lamarck). 

 Plate 29, figures I, la, specimen from Cocos-Keeling Islands. 



1816. Astrea microphthalma Lamarck, Hist. nat. Anim. sans Vert., vol. 2, p. 261. 



1914. Cyphastrea microphthalma Matthai, Trans. Linn. Soc. London., 2d ser., Zool., vol. 17, p. 43, plate 7, 

 fig. 6; plate 12, figs. 4-9; plate 13, figs. 1, 2, 7; plate 34, fig. 4. 



As Matthai has described this species in detail, and as the specimens from 

 Cocos-Keeling Islands exhibit no noteworthy peculiarities, a redescription seems 

 unnecessary. One specimen and fragments of another are spheroidal or sub- 

 hemispherical. Another fragment is from a specimen with a hillocky surface. 



Habitat, etc., Cocos-Keeling Islands. — Dr. Wood Jones states in his notes: 

 "The species is found on the lagoon margin of barrier flats, .in pools, and also in 

 the lagoon. Usually greenish in color." 



Distribution. — Red Sea; Indian Ocean; Philippine Islands. 



Cyphastrea serailia (Forskal). 



Plate 29, figs. 2, 2d, 2b, from Murray Island. Also plate 17, fig. 38, plate 18, fig. 39, of Dr. Mayer's article. 



1914. Cyphastrea serailia Matthai, Trans. Linn. Soc. London., 2d ser., Zool., vol. 17, p. 39, plate 7, fig. 4; 

 plate II, figs. 1-9; plate 13, fig. 8; plate 38, figs. I and 5. 



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



Corallum massive, upper surface rounded, with some undulations; up to 12 cm. long 

 by 6.5 cm. wide, and 4 cm. or more thick. 



Calices, usual diameter 1.5 mm., from 1 to 1.5 mm. deep. Wall not at all or only 

 obscurely elevated. Distance apart 1.25 to 1.75 mm., evenly distributed over the surface. 



Septa in adult calices, 12 are equal or subequal in size and extend to the columella; 

 upper margins arched and distinctly exsert. The primaries are slightly longer than the 

 secondaries, and may be traced farther into the columellar tangle; they are also usually 

 slightly thicker. Interseptal loculi between primaries and secondaries about as wide as 

 the combined thickness of a primary and secondary septum. The inner margins fall per- 

 pendicularly to the level of the columella; beset with slender dentations which incline upward 

 and have bluntish ends. Faces with crowded, low, blunt granulations. Perforations 

 usually near the columella. A third cycle of very rudimentary septa, which are mostly 

 represented by costae between the costal ends of the primaries and secondaries. All septa 

 thickened in the rather thick thecal ring, where they are all represented by short costs. 



'These species are figured in U. S. Geological Survey, Professional Paper 98-T. Plate 98, figs. 1, la, 2, 

 2a, 3, represent S. hyades (Dana); plate 99, figs. 1, la, lb, 2, 3, 3a; and plate 100, figs. 1, 2, 2a, 3, 3a, 3b, 

 illustrate S. bournoni M. Edw. and H. 



