198 Mr. W. L. Distant on Malayan Entomology. 



are rarely seen, but It is evident that they arise from the outer 

 part of the parent by a growth of several spinules in a de- 

 finite direction, by their arching upwards and inwards, and 

 meeting so as to form a hood closed behind. 



The texture of the hood is very close, the openings in it 

 are extremely small, and the spinules on the parent corallite, 

 which were within the boundary of the hood-forming ones, 

 are still visible, and remain so until after the septa have ap- 

 peared on the opposite side of the inner part of the young 

 corallite. The usual exogenous growth produces a slight 

 nariform swelling on the end of the bud. One minute bud 

 may be seen behind another on the same axial corallite ; but 

 this is not a common occurrence, for the solidity of the struc- 

 tures of the colony appears to have been the result of very 

 slow growth, and slow growth seems to be incompatible with 

 budding, although not with increased deposit of the calcareous 

 element of the sclerenchyma. Exceedingly narrow tubular 

 passages may be seen in sections or in fractures, and they lead 

 from the cavities of corallites to the surface, where their open- 

 ing is to be detected with some difficulty, as it is surrounded 

 by the bases of spinules. 



The wall of the corallites is a thick lamina, as seen in 

 transverse sections, and is surrounded by very regularly spaced 

 radially disposed spinules, looking as if they were sections of 

 costffi ; but these last do not exist. Two opposite primaries, 

 separate at the calice, are seen to be often united lower down, 

 and they are stout and singularly imperforate. 



Sometimes the four other primary septa, which are small 

 and inconspicuous in the calice, are well developed deeper 

 down ; there they may unite with the larger primaries. Any 

 members of the second cycle are rarely seen ; but still they 

 do sometimes exist. Finally, it is remarkable that although 

 the other species of Madrepora noticed in this communication 

 have either fairly developed dissepiments, endothecal in kind, 

 or else true tabulse, this last-mentioned form has neither of 

 these internal structures. 



XXVI. — Contributions to a Knowledge of Malayan Ento- 

 mology. Part III. By W. L. Distant. 



The present short paper is again devoted wholly to Rhopalo- 

 cera, and is descriptive of some new species contained in a 

 collection made by Herr Kunstler in Perak, and now belonging 

 to the Calcutta Museum. For an opportunity of examining 

 this collection I am much indebted to the authorities of that 



