306 PEOF. p. M. DUNCAN ON THE 



Tlie corallum is compound, adherent, thick, and mseandroid. 

 The base is naked, sublobed, and finely costulate. The calicos 

 are grouped in simple linear series, and each series is separated 

 from its neighbours by simple and low collines. The calicinal 

 centres are distinct, and there is a papillary columella. The 

 septa are numerous, radiate, and are very granular and " cre'pus." 



The diagnosis of M. Bottce and a figure are given by Eousseau *; 

 and the diagnosis is repeated by MM. Milne-Edwards and Jules 

 Haimef. It refers to one specimen, and relates also to shape, 

 which depends upon peculiar growth. 



A specimen from Mergui collected by Dr. Anderson, P.E.S., in- 

 dicates that the following is a correct specific diagnosis : — 



The corallum is flat or slightly concave above, not universally 

 adherent, tall or short. The base bas its costal markings long 

 and alternately large and small, finely dentated, and somewhat 

 flesuous. 



The collines bound long and short series of calicos, and, on the 

 whole, radiate from the centre to the circumference ; they are 

 broad, but high, and often show no trace of develoi^ment in a 

 special direction. The calicos are shallow, the columellary space 

 is small and deep, the columella is papillary, and the septa, often 

 formed by th.e union of several, are close, confluent, subequal, 

 stout, and granular at the sides, and warty and crisped above. 

 There are from 30 to 40 septa. The calicos are from 4 to 8 mm. 

 in breadth, and tlie increase is by budding between contiguous 

 calicos. 



The Construction of the Hard Parts o/Mseandroseris Bottse. — 

 The interseptal loculi extend from calico to calico and over the 

 collines ; they are very narrow, and hence their depths cannot be 

 penetrated by vision from above. They are widest and deepest 

 near tbe calicular centres, and are narrow and shallow else- 

 where. 



The compound granulations on the free edge of the septo- 

 costte are warty, broad, tall, and separate, and each one is the 

 summit of one of the trabeculse of which the septum is comjDosed. 

 Tbese granulations extend laterally, but do not touch over the 

 interseptal space, neither do they touch their neighbours on the 

 same septum. They arise from more or less constricted necks. 



* Op. c?y.pl. 28. fig. 1. 



t ' Hist. Nat. cles Corall.' vol. iii. p. 61. 



