328 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



were actually drawn up from a specimen of Comatulella brachiolata which in some 

 way he mistook for the type of Lamarck's Comatula Solaris. 



Mtiller described Actinometra imperialis as having the centrodorsal a flat pen- 

 tagonal disk which is somewhat concave centrally. The cirri are arranged in a 

 single marginal row. Carpenter, who subsequently examined the type at Vienna, 

 found that the centrodorsal has lost all trace of the cirrus sockets on one side and 

 is almost reduced to a level with the radials. 



The cirri are XIV, 20, the segments being as long as broad. The central seg- 

 ments of the younger cirri are longer than broad. The cirri are stout at the base, 

 but decrease in stoutness and then remain of the same width. 



The radials are very short. The IBr series are very short, and the two elements 

 appear to be united with each other by suture. 



The first brachial element seems to be a syzygial pair. 



PI is on the epizygal of the first syzygial pair. The next 2 brachials (the third 

 and fourth) are united by syzygy. Beyond this point the intersyzygial interval 

 is from 3 to 6 muscular articulations. 



The 10 arms are said by Miiller to be 325 mm. in length. The brachials are 

 dorsally flattened. The bases of the arms are narrower than the portion imme- 

 diately following. 



PI is the largest pinnule. P 2 is also large, though smaller than P,. P 3 is very 

 small, and the following pinnules increase in length. On P 2 the lowest segments 

 are set off from the others by being broadened. The segments of the pinnules 

 are laterally compressed, broader than long, and have a sharp edge behind. 



The disk is beset with calcareous concretions, short flowerlike nodules with 

 from 3 to 5 foliaceous plates. 



The color, dry, is orange. 



In the following terms Dr. P. H. Carpenter described a specimen from Aus- 

 tralia which he found in the Hamburg Museum bearing Liitken's manuscript name 

 Actinometra robusta: 



The centrodorsal is a low flattened disk 7 mm. in diameter, bearing a single or 

 partially double row of cirri. 



The cirri are XX-XXV, about 23. The first 3 or 4 segments are broader than 

 long and those following are about as long as broad, or a trifle longer than broad, 

 decreasing slightly toward the end. The penultimate has a small opposing spine. 



The radials are visible. The IBrj are short, trapezoidal, closely united laterally, 

 and united by syzygy at their wider distal edges to the triangular IBr 3 (axillaries), 

 which are twice their length. 



The 10 arms are probably about 125 mm. long; they are rather more than 3 mm. 

 wide at the fifth brachial, but increase to 5 mm. by the twelfth, remaining uniform 

 for a short distance and then tapering to the ends. The arms consist of about 200 

 brachials. 



The first 2 brachials are united by syzygy, this syzygial pair being twice as 

 broad as its outer length, which is slightly the longer, though the hypozygal (first 

 brachial) is longer on the inner side, which is very closely united to its fellow. The 

 epizygal is acutely triangular, with curved sides, half as long as broad. The second 



