288 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Description. The centrodorsal is low hemispherical, with the bare dorsal pole 

 slightly convex, finely pitted, 3.5 mm. in diameter. The cirrus sockets are arranged 

 in 2 irregular rows. 



The cirri are XX, 32-39 (usually nearer the latter), 25 mm. long. The longest 

 cirrus segments are slightly longer than broad. The short distal segments are but 

 little broader than long. Rather small, though sharp and prominent, dorsal spines 

 are developed from the twentieth segment onward. 



The radials are just visible beyond the run of the centrodorsal. The IBr! are 

 very short, bandlike, about six times as broad as long. The IBr 2 (axillaries) are 

 nearly three times as broad as long, with the lateral edges slightly more than half as 

 long as those of the IBr^ Eight IIBr series are present in the type specimen, six of 

 which are 4 (3+4) and two of which are 2. There are six IIIBr series, all 2, and all 

 developed internally except one, which is developed externally by the side of an 

 internal series. The division series are well rounded dorsally, in lateral apposition 

 and laterally flattened as far as P D , with the apposed edges slightly produced outward. 

 The elements of the IIBr and IIIBr series are interiorly in lateral apposition through 

 slightly produced edges. 



There are in the type specimen 24 arms about 85 mm. long, perfectly smooth 

 and well rounded dorsally. 



P D is 6 mm. long, with 22 short segments, none of wliich are longer than broad; 

 the second-fifth are strongly carinate dorsally, and from the sixth segment onward 

 the pinnule is rather strongly prismatic. P l is 12 mm. long, with 27 segments, all of 

 which are short, the distal being scarcely twice as long as broad ; the second-sixth are 

 strongly carinate, and the pinnule is prismatic from the seventh onward. P 2 is 13 

 mm. long, with 25 segments, resembling Pj but with the distal segments more elongate; 

 the second-sixth segments are carinate. P 3 is the largest and longest pinnule, 14 mm. 

 in length, slightly stouter throughout than P 2 , with 22 segments, of which the second- 

 seventh are carinate; a supplementary carination extends along the pinnule from the 

 sixth segment to the tip. P 4 is 9 mm. long, with IS segments. P 5 is 6 mm. long. 

 The carination of the earlier segments is very strong on the fifth-seventh pinnules 

 but nearly or quite obsolete from that point onward. 



The color in alcohol is flesh color, with purple bands at the articulations. The 

 cirri are yellow. 



Notes. In the specimen from off Jolo the cirri are 35 mm. long and are com- 

 posed of 39-45 segments. There are 32 arms. All the IIBr series are 4 (3+4), and 

 all the following division series are 2. P 3 is 22 mm. long and is composed of 24 or 25 

 segments. 



This specimen seems to belong to H. pulchra, the slight differences presumably 

 being due to greater size as compared with the type. 



Remarks. While in its general habitus this species perhaps most nearly resembles 

 H. savignii, it is undoubtedly most closely related to H. singularis, from which it 

 differs most strikingly in having P 3 instead of P 2 the largest pinnule. 



Localities. Investigator station 387; southwest of the mouths of the Irrawaddy 

 river, off Cape Negrais, Burma (lat. 15 25' N., long. 93 45' E.); 73-89 meters; sand 

 and coral; November 16, 1909 [A. H. Clark, 1912] (1, I. M.). 



