22 VERRILL, SYNOPSIS OP 



cells with- twelve septa, the six primary ones equal, the sec- 

 ondary well developed, about half as broad as the primary 

 ones. The cells at the bases of the branches are wholly 

 immersed, but have twelve conspicuous septa ; on the lower 

 surface there are very few cells ; these are very small, and 

 wholly immersed. Surface of the coenenchyma openly re- 

 ticulate and porous, with spinose granules ; exterior of cor- 

 allites densely covered with small, lacerate spines. 



Breadth of largest specimen 18 inches; height from 

 base 5. 



Hong Kong, China. Dr. Wm. Stimpson. 



This species is allied to M. plantaginea Lamarck. The 

 latter has, however, shorter and more crowded corallites, 

 with the exterior distinctly striated, and they are scarcely 

 tumid at the base. The terminal ones are also much larger 

 and thicker, giving an obtuse appearance to the branches. 



MADREPORA PROLIXA Verrill, nov. sp. 



Corallum diffusely branched, consisting of several di- 

 verging branches, which are divided into very numerous 

 branchlets, forming densely branched clumps. Branchlets 

 very proliferous, some of them consisting of several long, 

 slender, often curved corallites, others are slender and elon- 

 gated ; terminal one surrounded below by several appressed 

 tubular corallites, thus forming a slender, irregular branch. 

 Corallites all slender, tubular, and much elongated, the ter- 

 minal ones particularly so, often half an inch or more. 

 Cells small, terminal, with six distinct septa. Surface of 

 the coenenchyma and exterior of the corallites evenly and 

 crowdedly covered by delicate granulations, without distinct 

 striations, but showing irregular pores in some places. 



Height 6 inches ; cells .02 of an ineh in diameter. 



Ousima. Dr. Wm. Stimpson. 



This species closely resembles M.longicyathus Edw.and H. 

 A typical specimen of the latter, sent by M. Edwards to the 

 Museum of Comp. Zoology, with which I have had an opportu- 

 nity of comparing this, differs in the structure of the ccenen- 

 chyma, which is penetrated by numerous linear pores, giving 



