750 MB. J. STANLEY GAEDINEB ON [June 6, 



represented in Klunzinger's figure. The large, distinct, primary- 

 septa are extremely characteristic. 



Funafuti ; dredged in the South Ship's Passage from 5 fathoms. 



7. AsTR^A EOTUMANA, u. sp. (Plate XLVn. fig. 3.) 



The corallum forms large incrusting masses, covered under- 

 neath by a thin epitheca. The colony does not seem to increase 

 much by fission and budding at the edge, which is very thick and 

 costulated down to the epitheca. 



The calices vary from 6 to 11 mm. in diameter by 4-6 mm. in 

 depth to the top of the columella. The septa are usually rather 

 thin, except in their exsert portions, and the interseptal loculi are 

 wide and deep. In the largest calices two orders of septa are 

 complete and there are commonly 8 or 10 septa of the third order. 

 The primary septa are about 2*5 mm. exsert, and about 2 mm. 

 broad at the level of the thecal rim. Lower down they broaden 

 out, the edges still lower running almost horizontally into the 

 columella, but giving off first each a blunt, vertical paliform tooth. 

 In the smallest calices the primary septa alone join the columella, 

 but in the larger calices often 3 or 4 of the secondary septa fuse 

 with it as well. The latter may somewhat simulate the primaries, 

 but the secondaries never attain the same exsertness nor are their 

 paliform lobes well-marked. The tertiary septa are about 1 mm. 

 exsert, and are very thin and narrow, being seldom more than 

 1'5 mm. broad. 



The walls vary from 1*5 to 3 mm. in thickness, and the rims of 

 the calices are about 1 mm. high. The septa are not continuous 

 between the calices, so that the sulci are very conspicuous and 

 deep. The columella is formed by fine, loosely joined trabeculse 

 from the septal edges, and in the larger calices, in which it is 

 often 1-1*5 mm. broad, has a finely papillate surface. In the 

 smaller calices the columella is often scarcely visible. 



The interseptal loculi are open for about 1 cm., below which 

 they are closed by nearly horizontal eiidothecal dissepiments, 

 about 1 mm. distant from one another. The thecse of neighbouring 

 corallites are joined also by similar exothecal dissepiments. 

 (PI. XL VII. fig. 3.) 



Eotuma ; a single specimen, 13 cm. long by 1 cm. broad, part of 

 an incrusting mass. 



8. AsxejEA aepinis, Milne-Edwards & Haime. 



Favia affinis, Milne-Edwards & Haime, Cor. ii. p. 429 (1857). 



I have referred a single specimen with 19 calices to the above 

 species, as it differs from A. denticulata and agrees with the 

 above species in the characters given by Milne-Edwards and 

 Haime. The dividing walls of the specimen are as thick as in 

 my specimens of A. denticulata, but the thickness varies enormously 

 in all species of Astrcea. My specimen is too small for any 

 definite statement, but the two species will, I think, be found to 

 be identical. 



Wakaya, Eiji ; outer reef. 



