180 Proceedings of the Biological Society of Washington. 



The species represented in the collection recently received 

 from Captain Suenson are the following: 



Family COMASTERIDjE. 



Sub-family COMASTER] N\E. 



Comanthus japonica (J. Midler). 



Locality. — Eight miles outside of Hong Kong harbor (L )- J° \'l' N. lat., 

 114° 15' E. long.); 14 fathoms; November 16, 1911. 



Remarks. — The cirri of the single specimen collected are xxvni, 31-34, 

 .'!•") mm. to 40 mm. long; the segments in the outer half are broader than 

 long, highly polished, and bear high sharp carinate processes. There are 

 about forty arms 150 nun. long; all of the division series are 4 (8+4). 



The right anterior ray of this individual is very abnormal ; on the 

 right ii Br series ( as viewed dorsa'lly ) the inner in Br series terminates in 

 a doubled axillary — two axillaries side by side — forming an epizygal 

 superposed upon the single hypozygal of the syzygial pair; each half of this 

 doubled axillary gives off two arms so that four arms arise from this 

 division series. Ventrally the ambulacral groove on reaching this axillary 

 divides into three parts, one of which runs to the left ( right as viewed 

 dorsally) and soon divides, supplying two arms, while the other two rim 

 undivided to the two remaining arms. The left n Br series arising from 

 this ray is undivided; it consists of only nine brachials of which the last 

 bears a single terminal pinnule of large size; the structure tapers regularly 

 from the axillary to the base of the terminal pinnule; thethirdand fourth 

 brachials are united by syzygy so that this arm stump bears seven pin- 

 nules in all, six lateral on alternate sides of the arm and one terminal. 



This specimen appears undoubtedly to be referable to Cornaiitlius 

 japonica, though the edges of the brachials and of the elements of the 

 division series are less prominent than usual, and the cirri are rather 

 longer and more slender than is ordinarily the case. It agreesf well, 

 however, with specimens at hand from various localities in southern 

 Japan. 



The small number of arms and the processes on the distal cirrus seg- 

 ments distinguish it from the variety of Comanthus bennetii occurring at 

 St. Mathias Island (Proc. U. S. Nat. Mus., vol. 43, 1912, p. 391 ) which 

 is characterized by short outer cirrals. The much larger number of cirri, 

 cirrus segments and arms readily distinguish it from the southern Coman- 

 thus crassicirra which represents C. japonica in the Moluccas. 



Family ZY< i( >M ETEID.E. 

 Zygometra comata A. H. Clark. 



Localih/. — Eight miles outside of Hong Kong harbor ( 2'2° 12' X. hit., 

 114° 15' F. long.); 14 fathoms; November 16, 1911. 



Remarks. — The better of the two specimens has the centro-dorsal dis- 

 COldal, very slightly concave (almost flat) on the broad dorsal pole which 

 is .") nun. in diameter; the cirri are arranged in two irregular closely 



