A MONOGRAPH OF THE EXISTING CRINOIDS 255 



21 teeth which occupies rather more than its distal half. P5 is very slender and deli- 

 cate, 4 mm. long, without a comb. The following pinnules gradually increase in 

 length, the distal pinnules, which are very slender with greatly elongated segments, 

 being 6 mm. long. 



Locality. — Albatross station 5356; north Balabac Strait; Balabac Light bearing 

 S. 64° W., 15.5 miles distant (lat. 8° 06' 40" N., long. 117° 18' 45" E.); 106 meters; 

 temperature 27.78° C; sand and shells; January 5, 1909 [A. H. Clark, 1911] (1, 

 U.S.N.M., 27487). PI. 24, fig. 68. 



Remarks. — This species is as yet known only from the type specimen. 



COMISSIA PECTINIFER A. H. Clark 



Plate 25, Figures 69, 70 



Comissia pectinifer A. H. Clahk, Ann. and Mag. Nat. Hist., ser. 8, vol. 7, 1911, p. 644 (description; 

 Christmas I.); Crinoids of the Indian Ocean, 1912, p. 78 (detailed description; Christmas I.); 

 Smiths. Miscell. Coll., vol. 61, No. 15, p. 6 (published reference to the specimen in the British 

 Museum; Christmas I., H. M. S. Flying Fish: description); Unstalked Crinoids of the Siboga 

 E.xped., 1918, p. 19 (in key; range); Journ. Linn. Soc. (Zool.), vol. 36, No. 249, May 3, 1929, 

 p. 636 (Flying-fish Cove, Christmas I.) . 



Diagnostic features. — The cirri are numerous, XXXIV, 14-16 (usually 16), 

 14 mm. long; the longest cirrus segment is not more than twice as long as broad. 

 The arms are about 90 mm. long; the distal edges of the brachials are rather strongly 

 overlapping. The comb on Pi is composed of about 25 exceptionally long teeth; 

 P4 bears a comb of 15-16 teeth, only 9 of its segments not bearing teeth. 



Description. — The centrodorsal is moderately large, with a moderately large flat 

 dorsal pole. The cirrus sockets are arranged in 3 closely crowded marginal rows. 



The cirri are XXXIV, 14-16 (usually 16), 14 mm. long. The longer proximal 

 segments are nearly twice as long as broad and are slightly constricted centrally. 

 The eighth is a transition segment. The 2 segments preceding the penultimate are 

 from as broad as long to one-third broader than long. The segments distal to the 

 transition segment are very highly polished and bear small dorsal tubercles. 



The 10 arms are about 90 mm. long and resemble those of C. liitkeni. The distal 

 ends of the brachials are rather strongly overlapping. The elements of the IBr series 

 appear in external view to be united by syzygj^. 



The distal intersyzygial interval is usually 3 muscular articulations. 



Pi is about 12 mm. long and bears a comb composed of about 25 exceptionally 

 long teeth. Pi to P4 are provided with combs. The comb of P4 consists of 15 or 16 

 teeth, beyond which extends a toothless tip; only 9 segments of P4 are not supplied 

 with teeth. 



Notes. — In one of the specimens from the Kei Islands the long and slender arms 

 are 100 mm. in length. The centrodorsal is discoidal, with a flat dorsal pole 3.5 mm. 

 in diameter. The cirrus sockets are arranged in 2 and a partial third marginal rows. 

 The cirri are XXXIII, 14-16, 17 mm. long. The sixth is a transition segment. 

 The segments following the transition segment have a very slight pointed subterniinal 

 dorsal tubercle. The cirri are rather slender. The comb on Pi is composed of 29-33 

 long narrow teeth. P4 has a comb with 25-26 teeth. 



