ECHIlfODEEMAIA. 167 



A specimen with an arm 120 miUiin. long has the cirri 15'5 

 millim. long, the first pinnule 20 millim. long, and the arms 3 milUm. 

 at their widest ; in other words, these measurements are very much 

 the same as those of the specimens of A. Solaris lately referred to. 

 The faint white line which is so often seen along the middle of the 

 dorsal surface of the arms is to be seen in some specimens ; and in 

 some cases we may observe the black spots on the pinnules, to 

 which attention has already been directed, . 



It will be clear enough to th,e student that the specimens now Under 

 discussion present several points of considerable difficulty; but, though 

 they have the general facies of A. Solaris and on the other hand a 

 larger number of cirri and a feebler keel, thereby approaching 

 A. rohusta, they, at the same time, present sufficient constancy in 

 the retention of their differential characters to prevent our believing 

 that the differences that we observe have not passed within the in- 

 fluence of the laws of heredity. 



Albany Island. 



18. Actiiiometra rohusta. 



Actinometra robusta (jLutken, MSS.), P. H. Carpenter, Journ. lAnn. 

 Soc, Zool. xvi. p. 517. 



In specimens of this comparatively weU-marked form from " St. 

 144," * which were somewhat smaller than those described by 

 Mr. Carpenter, I noted that the basal joints of the arm wer« not so 

 distinctly knobbed, and that there was a faint carination to the basal 

 joints of the second pinnule. On the other hand, in a larger speci- 

 men from Port Curtis, which appeared to be particularly well deve- 

 loped, the knobs were very prominent. 



With regard to the specimens from St. 144, Dr. Coppinger notes 

 that they were " originally of a purple colour." 



19. Actinometra strota. 



Among the present collection of Crinoids Mr. Carpenter recog- 

 nized a single specimen of a species which he has distinguished as 

 A. strota, n. sp., and of which he wiU give a full account in his 

 forthcoming Eeport on the Comatulse of the ' Challenger ' Ex- 

 pedition. 



Port Molle. 



20. Actinometra cumingiL 



Comatula cumingii, J. Miilkr, p. 19. 



A delicate specimen with 10 cirri, the cirri having about 12 

 joints and no penultimate spine, and most of the joints being a 



* Probably Thursday Island. 



