344 THE VOYAGE OF H.M.S. CHALLENGER. 
Genus Metacrinus (Wyville Thomson, MS.), P. H. Carpenter, 1884. 
{ Eight to twelve inter- ( Ridges incomplete, : - 1. angulatus, n. sp. 
nodal joints with hori- + 
zontal ridges. Ridges. continuous, ; : 2. cingulatus, n. sp. 
{ Thirteen internodal joints with in- | 
Lower parts of curved _ sides. Interarticular i 3. murrayi, D. sp. 
Tan to rays smooth: pores to thirteenth node. 
Four radials; j une Roy yea Ten or twelve internodal joints ), 
the second ae J 3 with flat sides. oars 4. nobilis, n. sp. 
wey ZY SY opin pores to tenth node. 
joints. 
Sixty-five cirrus-joints. Interarticular pores to superbus, P. H. C. 
[| . eighteenth node. 
Six to ten internodal joints with nearly flat sides. Inter- 
J Y 
Lower parts of rays have raised distal edges. 
articular pores to about the sixth node. Ls 
. varians, D. sp. 
Radials irre- ] : 
gular; usu- : 
ally five 
or six; the 
secondand 
aoe Eleven or twelve smooth internodal joints, — - . . rotundus, P. H. C. 
6. moseleyi, 0. sp. 
Seven to nine internodal joints; the larger ones with a strong 
median girdle. 
often a | 
syzygy. } 
if { Three ray-divisions. Cirrus-facets as high as 
1 the nodal joints. Five to eight internodals with 7. wyvillii, n. sp. 
horizontal ridges, 
Six to 
nine | 
{ Stem with strong interradial ridges ] 
inter- 4 Four ray-divi- Bt ene nee, eueniay . costatus, n. sp. 
et Line oedal hollowed sides. Seven or eight 
‘oint eee ey internodals. 
Six radials; joints. ee igher 
the second 4 Hoan aes Eight or nine internodals, with 
and fourth = flat tubercular sides. Angles of 9: nodosus, 1. sp. 
syzygies. ~ l | nodals enlarged. 
meee { Stem pentagonal, with a tubercle at each Base) || 
ae | and ridges on the sides, but not forming a > 10. interruptus, n. sp. 
seer { complete g girdle. Usually eight distichals. { 
nodal : 4 a ; 
| Rounded stem without ridges. Usually ten dis- 
The ‘* Vega” specimen. 
[| Joints. [  tichals. 
stemsharp | incised. Le tuberastis, 7p. 
and pro- + 
duced out- | Eleven internodals with slight horizontal ridges. Infra- 
wards. [ nodals not incised. 
Angles of { Seven internodals with median tubercles. Infra-nodals not ; 1 
} stewarti, P. H. C. 
