26 
taper abruptly and are composed of six brachials which decrease rapidly in diameter and do 
not bear pinnules, and terminate at the fourth segment of the first pinnule; the cirri, are VII, 
12, 6 mm. long, very slender; all the segments are subequal, rather more than half again 
as long as broad, without dorsal processes ; the cirri are confined to the interradial angles of 
the centrodorsal occurring in two pairs with one at each of the remaining three angles. 
A second specimen has the inner arms 40 mm. 
^/ ^^ long and the outer up to 30 mm. in length ; the cirri 
,^;^ are VIII, in four interradial pairs. 
A third has the inner arms 40 mm. long and 
/'.c^S5?,« •>« ..-■ .^ ■■ j.|.jg outer up to 11 mm. in length; the cirri are VII, 
^/■]^,^;^..<.''- — three occurring singly and the others in two interradial 
pairs. 
A fourth has the inner arms 30 mm. long and 
the outer up to 10 mm. in length (from the axillary); 
the cirri are VII, resembling those in the first described. 
The last has the inner arms 30 mm. long ; 
none of the short arms are longer than the pinnule 
' borne bv the same axillary. 
Fig. I. 
Diagrammatic dorsal view of c<;/««/«/fl <'M««4',7, based All of the Specimens are light yellow brown 
upon the specimens from Stat. 273. Natural size. (Courtesy • ^rilniir 
of the U. S. National Museum). 
In spite of the unique arrn structure it is quite 
possible that this is merely the young of C. rotalaria. It will be remembered that in 
Promachocriims kergtielensis the so-called "interradial" rays and arms do not begin to form 
until after the first five (radial) rays and arms have attained a very considerable size, and 
they do not attain the length and stoutness of the latter until the animal is nearly fully grown. 
Subgenus Comattlla Lamarck. 
Key to the Species of the .Subgenus Comatula. 
a^ No cirri 
b' anterior arms more than lOO mm. (usually from 125 mm. to 150 mm.) 
in length (northern Australia to western Java, Singapore, 
HongKongandthe-Philippinelslands) . , Solaris^) 
c^ the arms are very stout and flat dorsally, increasing in lateral diameter 
to the twelfth-fourteenth brachials and tapering distally from that point 
onward (no rther n A u str alia) var. so/aris 
c- the arms are slender and well rounded dorsally, not increasing appre- 
ciably in diameter from the base (northern Australia to west- 
ern Java, Singapore, Hong Kong and the Philippine Is- 
lands) var. hamata 
l) Synonyms Aclinomeira imperialis J. Miillev; Aclinometra albonolata^ Act. iiiterinetl'n and Act. strata Bell; and Act. rohisln 
and Act. strata P. H. Carpenter. 
