A MONOGRAPH OF THE EXISTING CRINOIDS 553 



then diminishes and comes to be nearer their proximal ends, reappearing on the penulti- 

 mate segment as a moderately strong opposing spine. The radials are scarcely visible 

 even at the angles of the calyx. The IBri and IBr 2 are very convex, the former in 

 close contact laterally, the latter less than twice their length, almost triangular with 

 very open angles. The postradial series may divide four times. All the division 

 series are 2. The axillaries are short and broad with an open angle. The ossicles 

 immediately following each axillary are closely united laterally, and are slightly 

 raised in the middle of their junction with their successors. 



The 38 arms are about 125 mm. long and are composed of about 200 brachials. 

 The first three or four brachials on the two outer arms of each postradial series have 

 their outer sides flattened where they are apposed to their fellows of the next post- 

 radial series. The first brachials are rhomboidal. The second are shorter and more 

 wedge-shaped. The first syzygial pair (composed of brachials 3+4) is more nearly 

 oblong. The next five or six brachials are short and oblong, after which the brachials 

 become sharply wedge-shaped and somewhat longer, though still relatively short. 

 After about the fiftieth the brachials become blunter and more oblong, and finally 

 somewhat square toward the arm ends. The first syzygy is between brachials 3+4 

 and the next usually from between brachials 16+17 to between brachials 22 + 23. 

 The distal intersyzygial interval is 10-17 muscular articulations. 



The largest pinnules are those borne on the fourth and five following brachials. 

 P 3 and P c are the longest pinnules on the arm and consist of 25-30 stout cylindrical 

 segments. The pinnules of the first pair (Pi and P a ) are considerably shorter and 

 smaller than their three successors on each side. The pinnule on the tenth brachial 

 (P 5 ) is small on the inner arms of a postradial series, but more equal to its predecessor 

 on the outer arms. The next few brachials bear the smallest pinnules on the arm, 

 after which the length of the pinnules gradually increases toward the arm ends, but 

 the pinnules never become specially long. The disk is 25 mm. in diameter and is 

 naked and much incised. Sacculi are not very abundant along the pinnule ambulacra. 

 The color in alcohol is brownish white, with grayer perisome. 



In 1910 I examined this specimen at the Leyden Museum. The centrodorsal is 

 rather large, with the dorsal pole concave. The cirri are XL, 24, 25, 28, and 30. 

 The dorsal spines are very small and tubercular. There are 39 arms. The IIIBr 

 series are developed externally. The division series and first six or eight brachials are 

 in close lateral apposition and are sharply flattened laterally. P t is very small and 

 short. PZ is large, over twice as long as PI, and is of the same character as the corre- 

 sponding pinnule in Lamprometra palmata; its segments are slightly longer than broad. 

 PS is slightly longer and larger than P 2 . P 4 is of about the same size as P 2 . P 6 is 

 somewhat smaller than P 4 . The pinnules following are small and weak. The en- 

 larged lower pinnules are strongly curved outward and backward; they stand out 

 very prominently through their large size, the middle and outer pinnules being 

 especially short. 



Localities. Eight miles outside Hongkong Harbor (lat. 2212' N., long. 11415' 

 E.); 25 meters; Captain Suensson, November 16, 1911 [A. H. Clark, 1913] (1, C. M.). 



East of Hongkong (lat. 2315' N., long. 11740' E.); Captain Christiansen, July 

 26, 1912 (2, C.M.). 



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