358 Froceedings of the Royal Society 
radials is greater in that which has the longer stem. It is mainly 
composed of the hasals, which are 1-2 mm. in height, and form 
a nearly cylindrical tube, at the top of which are the short radials, 
having a more decided upward and outward slope. This causes the 
calyx to appear slightly constricted at the level of the basiradial 
suture, a feature which is very marked in some varieties of the 
adult form. 
As compared with equal sized specimens of R. lofotensis, these 
young individuals of R. raivsoni are distinguished by the relatively 
great height of the calyx in proportion to its width, the length of 
the basals, and the expansion of the calyx at the basiradial suture. 
The basals of R. lofotensis (uppermost stem -joint, Sars.) have a 
smaller share in the formation of the cup, and it expands uniformly 
upwards from the stem to the upper margin of the radials. 
It is noteworthy that even these two young individuals from the 
same locality present differences in the shape of the calyx such as 
are more distinct in adult sj)ecimens from different localities in the 
East and West Atlantic. Perrier’s genus Bemocrinus^ is founded 
upon a variety of unusual size, with a great disproportion in the 
heights of basals and radials, and a somewhat strongly marked 
circular furrow at the level of the highest points of the basals, so 
that it crosses the middle of the radials. 
Genus Bcdhycrinus, Wy. Th., 1872. 
IlycrinuSy Danielssen & Koren, 1877. 
4. Bail lycr inns gmciUs, Wy. Th., 1872. 
H.M.S “Porcupine,” 1869. Station 37. Lat. 47° 38' N., long. 
12° 8' W. 2435 fathoms. Temp. 36° *5 F. Globigerina ooze. 
One nearly complete specimen, and one stem with the basal ring 
attached, but wanting the rest of the calyx. 
Remarks. — A figure of this species was given by Sir Wyville 
Thomson on page 453 of The Depths of the Sea, together with 
the same description which he published in his paper on the 
* Sur un nouveau Crino'ide fixe, le Democrinus Tarfaiti, provenant des 
dragages du “ Travailleur, ” Comptes Rendus, Tome xcvi. No. 7, pp. 450, 451. 
See also “ Note on Democrinus Parfadi," Ann. & Mag. Nat. Hist., May 1883, 
p. 335. I am indebted to Professor Perrier’s kindness for a drawing of this 
interesting type. 
