148 
Genus Comatula Lamarck. 
Comatula 1816. Lamarck, Hist. nat. des animaux sans vertébres 
Vol. 2, p. 530. 
Comatula solaris (Lamarck). 
Comatula solaris 1816. Lamarck, Hist. nat. des animaux sans verteé- 
bres,. Vol. 2, p. 533. 
Antedon (Actinometra) robustum Lutken, M. S. 
Australia. One dry specimen. 
Comatula pectinata (Linnæus). 
Asterias pectinata 1758. Linnæus, Syst. Nat… ed. X, p. 663. 
Comatula multiradiata 1816. Lamarck, Hist. nat. des animaux sans verteé- 
bres, Vol. 2, p. 583. 
Antedon affinis Lutken, M. S. 
Actinometra affinis 1882. P. H. Carpenter, Journ. Linn. Soc. (Z00l.), 
Vol. 16, p.517; ”Challenger” Reports, Vol. 26, Zoology, pp. 59, 285, 287. 
Java. This is the specimen which was examined by Dr. 
Carpenter, and is mentioned by him under the name of Åctin- 
ometra affinis,. It has twelve arms (not eleven as stated by Car- 
penter) about 65 mm. long, the IIBr being 2 (1—- 2), though 
in its general size it is but little smaller than specimens from 
Singapore with arms 110 mm. long. The latter exhibit a sort of 
dimorphism which is not infrequent among the ten armed species 
of the Comasteridæ, though I am not aware of its occurence in 
any other family. In these species the specimens usually, when 
of the same general size, have arms of the same length; but more 
or less frequently one is found in which the distal portion of the 
arm instead of being moderately stout and tapering evenly to the 
tip is attenuated and greatly elongated with long brachials and 
widely separated pinnules, thus resembling somewhat the terminal 
portion of the arms in the Pentametrocrinidæ and the Antedonidæ, 
while normally the arm tips are much like those of the Himer- 
ometridæ. Mr. Frank Springer has clearly shown that Uinta- 
crinus is most nearly related to the Comasteridæ in (1) the eccen- 
tric position of the mouth; (2) the central position of the anus; 
(3) the absence of any calcified ambulacral skeleton on disk,' arms 
