i85 
2. Pachylometra sclakri (Bell). 
Bell. Marine luvcstiL^atiiins in South Africa, vol. 4, 1905, p. 140, pi. 3, fi|^s. i — 3 {Antedon 
sclaleri). 
A. H. Cl.VRK. Smithsonian Miscellaneous Collections, vol. 61, 1913, X" 15, p. 48 (I'achvlo- 
iiittra sclaleri). 
y. Pachylometra distincta (P. H. Carpenter). 
V. II. C.\K1'ENTER. "Challenger" Reports. Comatulae, 1S88, p. 247, pi. 51, fig. 1 [Anlcdon 
distincta). 
A. H. Cl.\RK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, 
p. 227 [Charitometra sinithi). 
Proc. U. S. National Museum, vol. 39, 191 1, p. 555 {Pachylometra distincta); p. 557 
{Pachylometra smithi). 
Smithsonian Miscellaneous Collections, vol.61, 1913, N" 15, \p. i\.Z {Pachylometra distincta). 
4. Pachylometra levigata A. H. Clark. 
A. H. Cl.\rk. I'roc. U.S. National Museum, vol. 36, 1909, p. 406 {Pachylometra levigata). 
Monachometra A. H. Clark. 
There is onlv one species in the genus Monachometra. 
I. Mo7iachometra fragilis (A. H. Clark). 
A. H. Cl.\rk:. Proc. Biol. Soc. Washington, vol. 25, 1912, p. 79 {Pachylometra fragilis). 
Stat. 166. 2°28'.5S., i3i°3'.3E. Halmahera Sea. 118 Metres, i E.\-. 
The centrodorsal is low, llattened hemispherical, 7 mm. in basal diameter and 3 mm. 
high; the cirri are closely crowded, arranged in two or three irregular rows and appro.ximately 
fifteen columns, three in each radial area; the cirrus .sockets in the proximal row reach the 
pro.ximal border of the centrodorsal. The centrodorsal in general resembles that of the species 
of Crinometra. 
The cirri arc about XXX, 17 — 18, 30 mm. to 35 mm. long, moderately slender; the 
first four segments are short, the fifth half again as long as broad, the si.xth, seventh and 
eight twice as long as broad, the following gradually decreasing so that the distal are about 
as long as broad, and the terminal increasing again so that the penultimate and antepenulti- 
mate are about twice as long as broad; the longer pro.\imal segments have slightly prominent 
ends, while the shorter distal have the dorsal distal margin slightly swollen. 
Deep, but very narrow, subradial clefts are present. 
The ends of the ba.sal rays are large and prominent, forming rhombic areas in the 
angles of the caly.x. 
The radials are very short, strongly curved, with a low, broad and obscure median tubercle. 
The IBr, are e.Kteriorly very short, band-like, with an obscure low median tubercle; 
inwardly they are produced toward the centre of the caly.x so that their sharply flatened 
SIBOGA-EXPEDITIK XLU b. ""* 
