208 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
sides; the portion of the stem remaining is composed of seventeen 
joints, with the anterior half of the eighteenth; the first stem joint 
is very short, the second about double its length, the third about 
double the length of the second, and so on to the fifth, which is 
squarish; the following joints increase more gradually in length, 
after the ninth being about twice as long as their terminal diameter ; 
the ninth and following joints also are rather strongly constricted 
centrally, with bulbous ends; first brachials very short, over twice as 
broad as long; second brachials about as long as broad at the proxi- 
mal end, trapezoidal, the distal end being about three-fourths the 
length of the proximal; remainder of arms lacking. 
The total length of the specimen is 15 mm., of which the calyx rep- 
resents a length of 1.5 mm. 
Type.—Cat. No. 22698, U.S.N.M. 
Professor Verrill regarded this specimen as a young example of 
f. lofotensis,; but Sars says that in the young of that species the stem 
joints are more slender than in the adult, whereas in R. verrilli they 
are very stout, resembling those of A. rawsonii more nearly than 
those of RP. lofotensis. The greatest difference is found in the first 
brachials of the two species, those of 72. lofotensis. being longer than 
broad, those of 2. verrilli being twice as broad as long; in the latter, 
moreover, two of the first brachials are much larger than the other 
three, a point which I shall discuss more fully later. 
