A MONOGRAPH OF THE EXISTING CRINOIDS 275 



The 10 arms are about 60 mm. long. The first brachials are wedge-shaped, 

 about three times as bioad as the exterior length, basally miited interiorly. The 

 second brachials are more obliquely wedge-shaped, about twice as broad as the exte- 

 rior length. The first syzygial pair (composed of brachials 3 + 4) is nearly twice as 

 broad as long. The next 2 brachials are nearly oblong, about twice as broad as 

 long, and the following become very obliquely wedge-shaped, almost triangular and 

 nearly as long as broad, and further out less obliquely wedge-shaped and longer than 

 broad terminally. The elements of the IBr series and the first 2 bracliials have 

 everted and spinous distal ends, and the following brachials have strongly produced 

 and overlapping coarsely spinous distal ends. 



Syzygies occur between brachials 3+4, again from between brachials 10 + 11 

 to between brachials 13 + 14 (usually in the latter position), and distally at intervals 

 of 3 muscular articulations. 



Pi is 7 mm. long and is composed of about 25 segments, all of which are about 

 as long as broad. Their dorsal surface is excessively spiny, and frills of long spines 

 fringe their distal edges. The terminal comb consists of 7 or 8 small and well- 

 separated teeth, with similar but smaller teeth on the inner side of the pinnule. P2 

 is 4 mm. long with 16-20 segments, similar to Pj. P3 is somewhat larger, 5 mm. 

 long, with 18-20 segments, the third-seventh or -eighth with a gonad, and a terminal 

 comb. P4 and the followang pinnules are 4 mm. long, somewhat stouter than P3, 

 and without terminal combs, composed of about 12 very spiny segments. The 

 distal pinnules are very slender, about 5 mm. long. 



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

 bearings 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, 1918] (1,U.S.N.M., 27488). 



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

 which it was described. 



Genus LEPTONEMASTER A. H. Clark 



Actinometra (part) von Graff, Bull. Mus. Comp. Z06I., vol. 11, No. 7, 1883, pp. 130, 131, and 

 following authors. 



Leptonemasler A. H. Clark, Proc. U. S. Nat. Mus., vol. 36, 1909, p. 498 (type L. ventislus, sp. nov.); 

 Proc. Biol. Soc. Washington, vol. 22, 1909, p. 175 (referred to the Capillasterinae) ; Vidensk. 

 Medd. fra den naturhist. Forening i K0benhavn, 1909, p. 151 (comparison with Cominia); 

 Proc. U. S. Nat. Mus., vol. 40, 1911, p. 10 (represents in the West Indies the East Indian 

 Comissia); Ann. and Mag. Nat. Hist., ser. 8, vol. 7, 1911, p. 645 (together with Comatilia 

 represents Comissia in the West Indies); American Journ. Sci., ser. 4, vol. 32, 1911, No. 188, 

 p. 129 (characteristic of the West Indian fauna; significance); Crinoids of the Indian Ocean, 

 1912, p. 13 (corresponds to Comissia, part) ; Internat. Revue der gesamt. Ilydrobiol. u. Hydrog., 

 1914, pp. 3, et seq. (in the Atlantic represents Comissia, in part; range); Beitr.age zur Kenntnis 

 der Meeresfauna Westafrikas, Echinod. II, Crinoidea, p. 309 (Caribbean; corresponds to the 

 East Indian Comissia: connects the Caribbean Sea with the southwestern Indian Ocean); Die 

 Crinoiden der Antarktis, 1915, p. 181 (range; represented in the Indo-Pacific by Comissia, 

 part); American Naturalist, vol. 49, 1915, p. 525 (bathymetric range); p. 539 (asymmetrical 

 disk); Unstalked Crinoids of the Siboga Exped., 1918, p. 3 (in key); Univ. Iowa, Studies in 

 Nat. Hist., vol. 9, No. 5, 1921, p. 12 (confined to the West Indies); p. 15 (in key); the Danish 

 I ngolf -Esped., vol. 4, No. 5, Crinoidea, 1923, p. 39 (range); p. 50 (in key). 



