390 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The 10 arms are 75 mm. long. They are in close apposition with their neighbors 

 on each side. The first brachials are broadly pentagonal and are partially united by 

 their inner sides, which are somewhat shorter than the outer. The second brachials 

 are irregularly quadrate with their inner sides projecting beyond the edges of the pre- 

 ceding segments. The outer sides of both the first and second brachials are somewhat 

 flattened laterally, and there is a synarthrial tubercle on the articulation between 

 them just as in the case of the elements of the IBr series. The first syzygial pair 

 (composed of brachials 3+4) is short and oblong. The next few brachials are short, 

 strongly rounded dorsally, and nearly oblong, with slight backward projections alter- 

 nately from the inner and outer sides of their proximal edges. The following brachials 

 are short and sharply wedge-shaped ; they are at first considerably broader than long 

 but narrow rather quickly and also commence to overlap so that the middle and later 

 brachials are almost saucer-shaped. 



Syzygies occur between brachials 3+4 and 9+10, and distally at intervals of 

 7-13 (usually 10 or 11) muscular articulations. 



None of the pinnules are specially distinguished. P t is slender and consists of 

 about 15 smooth cylindrical segments. P a is shorter and slenderer. P 2 is about as 

 long as PI but it is stouter, composed of thicker segments, which are all very smooth. 

 The basal segments of the next two pairs of pinnules are still rather thick, after which 

 they decrease in size and the pinnules increase very slowly in length, never becoming 

 especially long and consisting of smooth cylindrical segments. 



The disk is about 6 mm. in diameter, and the anal tube is plated. Sacculi are 

 closely set along the pinnule ambulacra. 



The color is light brown, with purplish bands. 



Notes.- -The preceding description is adapted from Carpenter's original description 

 of the type specimen in the Hamburg Museum. I examined this specimen in 1910 and 

 made the following notes upon it: The 10 arms are about 95 mm. long. The cirri 

 are XI, 27-33, 23 mm. long, moderately slender. The longest proximal segments are 

 from slightly broader than long to about as long as broad, and the short outer segments 

 are about twice as broad as long. Long, sharp, and prominent dorsal spines are devel- 

 oped from the tenth or eleventh segment onward. The cirri have a very slight distal 

 taper. The synarthrial tubercles are prominent, but broad and blunt and not pro- 

 duced as in A. ensifer. 



I was able to compare the type specimen directly with the 10-armed specimen 

 from Japan in the Copenhagen Museum, which had been included in the original 

 description of Himerometra (Heterometra) schlegelii in 1908, and found that in size, as in 

 other characters, there is the closest agreement. 



A specimen without locality in the Hamburg Museum closely resembles the type 

 specimen in every particular, though it is slightly smaller, the arms being 70 mm. long. 



Localities. Canton, China; Werner [P. H. Carpenter, 1881, 1883, 1888; Hartlaub, 

 1891; A. H. Clark, 1912, 1913, 1915, 1918; Gislen, 1919; Mortensen, 1934] (1, H. M.). 



"Japan" [A. H. Clark, 1908, 1909, 1912, 1913, 1915, 1918] (1, C. M.). 



No locality; C. Eberstein [A. H. Clark, 1912, 1913, 1915, 1918] (1, H. M.). 



Geographical range. The habitat of this species is somewhat uncertain, but is 

 probably southern Japan or somewhere in the area covered by the southerly exten- 

 sion of the southern Japanese fauna. The specimen without locality carried the same 



