Ëdward i 

 ililne-Edwards 181 

 ulilni I dwards i 

 ililm I dwards i 

 Verrill 1864. 

 mper 1872. 

 . . Klunzinger 1879. 

 xequiserialis Quelch 1886. 

 . < >i im.imi 1 SSS. 



. .//;/</ tnicranlhus Ortmann 1888. 

 - ïhyllia nigrescetis Vaughan ims. 



;. Nalahia-bay, Nusa-Laut-island. Depth 46 meter. 1 ex. 

 ■; Banda. 1 ex. 

 it. 277. Kulewatti-(Sollot-)bay, Dammer-island. Depth 45 meter. 12 ex. 

 Stat. 303. Haingsisi. 3 c\. 



Billiton. 1 ex. — Red Sea. 3 ex. - Japan. 1 ex. — Red Sea. Leiden Mus. 3 ex. — Java. 

 JUNGHUHN leg. Leiden .Mus. 2 ex. — Amboina. HOEDT leg. Leiden Mus. 1 ex. — Locality 

 unknown. Leiden Mus. 2 ex. 



A.ccording to Ki 1 nzinger the difference between D. micranthus (Ehrenberg) and IK nigr 

 eens Dana is that the latter lias no ribbcd surface, and Dana's figure shows (says Klunzinger) 

 that the calicles are all short and not arranged in two rows and that the branches are situated 

 in the same plane. Now the specimen of Stat. 234, a fine big specimen, agrees perfectly both 

 in the arrangement of the branches and the situation of the calicles with Dana's figure. h is 

 beyond all doubt that it belongs to the same species as Dana's specimen. Only the surface is 

 ribbed, whenever not so clearly and regularly as in the D. ramea of the Mediterranean, and 

 the ribs are a little coarser than in that species. On the thinner branches the calicles are situated 

 in two mus this is shown verv clearly also by Dana's figure in tact - in each row the 



calicles bend alternating forward and backward. By the growth in thickness of the branch these 

 alternating calicles are pushed away from each other, so that they come to lie more and more 

 on the front- and backside of the branch. In this manner the regularitj decreases. Moreover 

 secondary calicles are formed on the front- and backside. In this way the regularity in the 

 arrangement of the calicles has disappeared altogether in the oldest part of the colony. The 

 same arrangement of the calicles — regular in two rows on the endbranches, irregularly 

 distributed on the thicker branches can be seen in several specimens, which have the 



branches arranged in every direction, though not to the same extent. There seems to be a 

 connection between the arrangement of the calicles and the method of branching. When the 

 branches are all situated in the same plane, the thicker ones especially are so crowded that 

 no room is left lor the calicles between them : the calicles have to push forward and backward. 

 This is oi course not the case when the branches are arranged in all direclions. As 1 have 

 g my material every degree from branching in one direction to branching in all directions 

 s not give any support for a separation between /'. nigrescens and />. micranthus. 

 to the general statements of Wood foNi about the growth of corals D. 



that form of the species which grows in streaming water, the flat side of the 

 ndicular to the direction of the curn m . 



