316 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Another specimen has 22 arms 100 mm. long. Four of the IIBr series and two 

 of the IIIBr series are 2, the IIIBr 2 series being both internally developed. The 

 cirri have 33-34 segments. 



A third specimen has 22 arms 95 mm. long. Both the IIIBr series, one externally 

 and one internally developed, are 2, all the other division series beyond the IBr series 

 being 4(3+4). The cirri are XXIII, 29-33, 23 mm. long. 



A fourth specimen has 27 arms 90 mm. long. Of the IIBr series one is 2 and the 

 rest are 4(3+4). Six of the IIIBr series are 2, only one being 4(3+4). The cirri 

 have 26-29 segments. 



A fifth example has 18 arms 85 mm. long. One postradial series bears two 

 undivided arms. The 8 IIBr series present are 4(3+4). The cirri have 27-28 

 segments. One cirrus has the distal half regenerated. 



The sixth specimen has 21 arms 80 mm. long. One of the IIBr series is 2, the 

 other 9, the single IIIBr series being 4(3+4). The cirri have 26-30 segments 

 of which the longest are nearly as long as broad. 



The specimen from Java was described by Prof. Johannes Miiller in the following 

 terms: The centrodorsal is fiat in the middle and bears about its margin a row of 

 cirri. The cirri have 45 segments which are not longer than broad and of which the 

 greater part, except those at the base, bear a swollen process. There are three radials 

 (that is, there is one radial and the two elements of the IBr series) ; the radial axillary 

 is without a syzygy (that is, the elements of the IBr series are united by synarthry). 

 The IIBr series are 4(3+4), the second element resting obliquely on the first. There 

 are sometimes present IIIBr 4(3+4) series. The second element of the IIIBr 

 series and the second brachial of the free undivided arms lie obliquely on the ossicle 

 preceding, as in the case of the second element of the IIBr series. There are 26 arms. 

 The brachials following the second are very short. The two first pinnules are small, 

 the two following are larger, and those succeeding become smaller. 



I examined Muller's type specimen at the Paris Museum in 1910 and found it to 

 represent the form I had described in 1909 as Amphimetra mortenseni. The cirri are 

 XXIII, 38-44. There are 25 arms. The 10 IIBr series are 4(3+4). Of the five 

 IIIBr series present, four are 4(3+4) and one is 2. The lateral borders of the division 

 series are produced into a lateral shelf. The synarthrial tubercles are small, but 

 prominent, as in the type specimen of Amphimetra discoidea from Port Molle. The 

 brachials are very short, with their distal borders slightly produced. P D is very small 

 and weak. P! is a little larger than P D , and P 2 is sometimes a little larger than PI or 

 sometimes very much larger than PI and resembling P 3 . P 3 is the largest pinnule, 

 long, rather stout, and composed of 26 segments of which the majority are about as 

 long as broad. P 4 resembles P 3 and reaches almost the same size, or is a little shorter 

 than P 2 . The following pinnules are short. P 3 is stouter, longer, and more stiffened 

 than is usually the case in related species. 



Localities. Investigator; Port Blair, Andaman Islands [A. H. Clark, 1909, 1911, 

 1912, 1918] (1,1. M.) 



Investigator; Andaman Islands [A. H. Clark, 1912] (5, U. S. N. M., 35176, 35190, 

 35203, 35219, 36240, 36241; I.M.). 



Kwala Cassan, Malay Peninsula; Ed. L. Mayer [A. H. Clark, 1912] (6, H. M.). 



