206 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



developed externally in reference to the IIBr series. The overlapping of the distal 

 edges of the brachials begins at the second and is strongly developed. P D is about 

 13 mm. long, very stout, the component segments having prominently spinous distal 

 ends. 



January 24, 1910; of the nine specimens the largest has 43 arms 100 mm. long. 

 A very small specimen has 11 arms 35 mm. long. On the arms arising directly from a 

 IBr axillary P, is 6 mm. long, greatly enlarged as in fully grown individuals, with 12 

 or 13 segments. P a is very much smaller and more slender, and P 2 is smaller and 

 slenderer still. P 3 and the following pinnules are very small and short. 



These specimens collected by Mr. Gad are all pale flesh colored or light purplish, 

 with the perisome brown, as are all the others I have seen from the same locality. 

 They are practically uniform in size and are all much smaller than those in the U. S. 

 National Museum, the Museum of Comparative Zoology, the Yale University 

 Museum, and the collection of Prof. Robert T. Jackson of Harvard University, all of 

 which were obtained from Ward's Natural Science Establishment. But except for 

 the smaller size and the slightly inferior number of cirrus segments (probably cor- 

 related with the lesser size) I am unable to detect any difference. 



The description of this species was drawn up from a study of 25 specimens from 

 Singapore in the collections of the U. S. National Museum (2), the Boston Society of 

 Natural History (19), the Museum of Comparative Zoology (1), the Yale University 

 Museum (2), and Prof. Robert Tracy Jackson (1, now in the collection of the Museum 

 of Comparative Zoology), all of which were secured from Ward's Natural Science 

 Establishment. These show the following characters: 



One of the specimens in the U. S. National Museum has 40 arms 100 mm. long, 

 and XXXV stout cirri 30 mm. long. The IIBr series are all 4(3+4). Of the IIIBr 

 series 8 are 4(3+4) and 10 are 2, the latter most often developed interiorly. The 

 post-radial series are rounded and well separated. P 2 resembles Pj in character but 

 is only about half as long. 



The other specimen in the U. S. National Museum has 35 arms, mostly arranged 

 in 1, 2, 2, 1 order; the arms are 110 mm. long. The cirri are 30 mm. long and are 

 composed of 30 segments. The inner IIIBr series are usually 2 ; IIIBr series are usually 

 not present on the outer side of the IIBr series, but if present they are 4(3+4). 



The specimen in the Museum of Comparative Zoology (dry) has 31 arms 110 mm. 

 long. The cirri are XXX, 30, 30 mm. long. The IIBr series are all 4(3+4). The 

 inner IIIBr series are all present, and all are 2 ; there is a single exterior IIIBr series 

 which is 4(3 + 4). 



Professor Jackson's specimen (now in the Museum of Comparative Zoology) 

 has about 40 arms 110 mm. long. The cirri are XXXIII, 37-40, 37 mm. long. On 

 the anterior postradial series both the IIBr series are 2, and one of the lateral post- 

 radial series has one IIBr series 2 and the other 4(3+4). All the other IIBr series 

 are 4(3+4). On the postradial series with both IIBr series 2 all four of the IIIBr 

 series are 4(3+4). On the postradial series with one IIBr series 2 and the other 

 4(3+4) the IIIBr series are 4(3+4), 2, 2, 0. On the remaining postradial series the 

 IIIBr series are as follows: 0, 2, 2, 0; 4(3+4), 2, 2, 0; 0,2, 2,4(3+4). The IVBr 

 series following IIIBr 2 series are 4(3+4), and those following IIIBr 4(3+4) series 

 are 2. The postradial series are well rounded and are widely free laterally. 



