A MONOGRAPH OF THE EXISTING CRINOIDS 499 



from about 36 meters has about 150 arms. The centrodorsal is very small, slightly 

 stellate, and is sunken below the level of the radial pentagon. The color is dark 

 brown, with a broad light dorsal stripe on the arms and division series. The other 

 specimen is small. All the IIBr series are 2; one of the IIlBr series is 4 (3 + 4), the 

 rest being 2. 



The specimen from Siboga station 96 has about 80 arms which are 105 mm. 

 long. The centrodorsal is very small and stellate. 



The example from Mahinog, Camiguin Island, has about 65 arms. 



The specimen from the Sulu Sea taken in January, 1895, has 08 arms. It is 

 rather stout, with short and strongly overlapping brachials and relatively large 

 radials. Of the 10 IIBr series, 8 are 4 (3 + 4) and 2 are 2. The 4 IIIBr series follow- 

 ing the 2 IIBr 2 series, which are both on the same ray, are 4 (3 + 4), the other 16 

 being 2. Following the IIIBr 4 (3 + 4) series, the IVBr series are 2, and following 

 these there are 5 VBr 4 (3 + 4) series. On the other rays all the IVBr series are 

 4 (3 + 4). On 2 rays there is no further division. One ray has a single VBr 4 

 (3 + 4) series, and the last has 3 VBr series, two 2 and one 4 (3 + 4). 



Semper's specimen from Pandanon was considered by Carpenter as representing 

 a distinct species, which he called magnified. In the key to the species of the Par- 

 vicirra group of Actinometra he placed it next to divaricata (the Challenger specimen 

 from Banda), from which it was said to differ in having the rays closely united, 

 the interradial perisome plated, and the mouth interradial, whereas in dwaricata the 

 rays are well separated and the mouth is radial. Collectively, dwaricata and mag- 

 nifica were said to differ from briareus in having the centrodorsal stellate without 

 cirri, whereas in briareus there are XV-XX small cirri. Carpenter noted elsewhere 

 that in magnifica and dwaricata (as well as in C. alternans) the centrodorsal is "stellate, 

 with few or no traces of any cirri at all." 



In all of the specimens from Bantayan Reef, Cebu, the centrodorsal is greatly 

 reduced and stellate. 



Of the specimens from Port Galera, Mindoro, one has about 100 arms 140 mm. 

 long; another has about 100 arms 130 mm. long; another has about 120 arms 125 

 mm. long. One specimen has about 130 arms. 



Abnormal specimen. A curious example from Port Galera, Mindoro, has 78 arms 

 about 100 mm. long. All of the IIBr series are 2. Of the IIIBr series, 12 are 4 (3 + 4) 

 and 8 are 2. Of the IVBr series, 15 are 4 (3 + 4) and 14 are 2. All 9 of the VBr series 

 are 4 (3+4). 



In spite of the curious irregularity of the arm division, the details of this specimen 

 are those of Comantheria briareus, and it presents the characteristic facies of that form. 



Localities. West Java; J. F. van Bemmelen, 1894 [Horst, in A. H. Clark, 1911]. 



Danish expedition to the Kei Islands; Dr. Th. Mortensen; station 90; Sebesi 

 Strait, between Sumatra and Java; 36 meters; hard bottom; August 1, 1922 (1). 



Billiton [Koehler, 1895; A. H. Clark, 1911 (as Sunda Islands)]. Same [A. H. 

 Clark, 1913] (1, B. M.). 



Siboga station 33; Bay of Pidjot, Lombok; 22 meters and less; mud, coral, and 

 coral sand; March 24-26, 1899 [A. H. Clark, 1918] (1, U.S.N.M., E, 455). 



