A MONOGRAPH OF THE EXISTING CRINOIDS 331 



In the specimen from the China Sea recorded by Hartlaub the cirri are about 

 XIV, 12; but only 5 of them are preserved. It is possible that this is in reahty a 

 specimen of C. peciinata. 



The specimen from East Wallaby Island has the arms, which are remarkably 

 stout, about 125 mm. in length and about 7 mm. broad near the base. It is almost 

 black, but has a longitudinal light stripe on the dorsal side of each of the arms. 



The specimen from Long Island, Abrolhos, is not quite so large as the preceding. 

 It has the cirri XIII, 18. It shows no trace of the light mediodorsal stripe on the 

 arms. 



The example from the coast of Western Australia is of the broad-armed {robusta) 

 type and is uniform in color, almost black. 



Professor Doderlein's specimens from Thursday Island have the cirri XIII-XXI, 

 15-19. On an arm 95 mm. long, P, is 20 mm. long. On an arm 60 mm. long, P, 

 is only 11 mm. long. The pinnules resemble those of C. peciinata, but the combs 

 are much more developed. The comb is strongly developed in the outer half of P,, 

 and on P2 it sometimes equals half the entire length of the pinnule. There are traces 

 of a comb on the following pinnules also. P2 bears a high keel on the second and 

 third segments, though this is often almost entirely lacking. All of the arms are 

 grooved. The disk is warty and granulated. The color varies from dark brown to 

 dark violet. In some specimens the dorsal side is whitish. Regenerated portions 

 of the arms in otherwise dark specimens are light. Doderlein says that these speci- 

 mens of C. Solaris differ from C. peciinata in the granulated disk, in the grooving of 

 all the arms, in the large comb on the first 2 pinnules, and in the larger number of 

 cirri, which have a somewhat greater number of segments. 



Carpenter said that the calyx of the form from between Albany Island and 

 Somerset, wliich he originally called siroia, except for the almost entire absence of a 

 basal star, is not greatly different from that of the individual from Singapore which 

 he figured in 1879; but it is very much smaller than the calyx of the form which he 

 originally called rohusia which reaches 7 mm. in diameter, while 5 mm. is the maxi- 

 mum in the Challenger specimens. None of these last show any trace of the curious 

 diverticulum of the axial canal into the substance of the radials which occurs in that 

 variety. Several of the Challenger specimens are more or less immature. The 

 smallest are noteworthy for the great relative length of the brachials as compared 

 with those of the adults. 



Two specimens collected by the Alert in Prince of Wales Channel were described 

 by Bell as having the cirri XII, 18 + . The more proximal brachials in the snudlcr 

 individual are more "knobby" than the corresponding brachials in the larger. In 

 both the arms are broadest at a little distance from the disk. The keels on the basal 

 segments of P2 are well marked in the smaller specimen, but in neither are there any 

 very prominent keels on the basal segments of P3. The arms of the larger example are 

 about 120 mm. long and those of the smaller about 85 mm. In the larger Pi is about 

 20 mm. long, and the cirri are about IC mm. long. Both specimens are white, with- 

 out any mediodorsal line; dark spots or marks are prominently developed on the 

 pinnules. 



Bell described his Aciinometra albonoiata from Albany Island as having 20-25 

 cirrus segments, and the keels on the basal segments of P2 less prominent than those in 



