616 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



ranged from 13 to 47, but the great majority of individuals had between 32 and 43. 

 Only 11 were noted with more than 43 arms. The division series are very generally 

 4 (3 + 4), and it is not difficult to find individuals with from 38 to 40 arms in which 

 every division series is 4 (3 + 4). But on the other hand most individuals have 1 or 

 more of the division series 2, and in 1 specimen no fewer than 13 of the division series 

 are of this number. In 2 specimens, 1 with 40 and 1 with 42 arms, a VBr series is 

 present. 



The number of cirri ranges from none, a very common condition, to as many as 

 XVIII or XIX; but as a rule they are few and weak. 



Some of the specimens from Mer which I examined at the Museum of Compara- 

 tive Zoology present the following characters: 



There are 41 arms, the longest 95 mm. long. All the division series beyond the 

 IBr series are 4 (3 + 4). 



There are 40 arms, of which the anterior are 140 mm. in length. All of the 

 IIBr and IIIBr series are present, and all are 4 (3 + 4). There are IV cirri. 



The 39 arms are 130 mm. long. All of the IIBr series are 2, but 1 of them has 

 a supplementary interpolated ossicle. The 19 IIIBr series present are 4 (3 + 4). 

 The centrodorsal is regularly stellate with no trace of cirrus sockets, and its dorsal 

 surface is sunken almost to the level of that of the radial pentagon. 



A specimen with 38 arms has all the division series beyond the IBr series 4 

 (3 + 4). 



An example with 37 arms about 135 mm. in length has 1 of the IIBr series 2, 

 all of the other IIBr series and all of the IIIBr series being 4 (3 + 4). 



A specimen with 37 arms 75 mm. long has no cirri. 



A specimen with 35 arms 85 mm. long has the cirri VI, 15-16. 



An individual with 31 arms has 7 of the IIBr series 2 and 3 of them 4 (3 + 4); 

 the further division series are all 4 (3+4). 



In a specimen with 27 arms about 110 mm. in length all of the division series 

 beyond the IBr series are 4 (3 + 4). 



A specimen with 26 arms also has all the division series beyond the IBr series 4 

 (3+4). 



In an example with 24 arms the 10 IIBr series are all 4 (3+4), and the 4 IIIBr 

 series are all 2. 



A young specimen has 13 arms 27 mm. long. 



A specimen from Friday Island has about 52 arms which are 130 mm. in length. 



A specimen from the Great Barrier Reef is large and stout, with 49 arms 150 mm. 

 long. Two of the IIBr series are 2. The centrodorsal is sunken to the level of the 

 radial pentagon. 



The specimen from Cape York which served as the type of Actinometra annulata 

 according to Bell presents the following characters : 



The centrodorsal is discoidal, flat, with the cirri arranged in a single marginal 

 row. 



The cirri are about XV, about 15, 8 mm. long. None of the cirrus segments are 

 much longer than broad, although the third, fourth, and fifth are a little so. The 

 succeeding segments have distinct, though not prominent spines, though they are 

 not always present on all of them. 



