REPORT ON THE CRINOIDHA. 315 



the adjacent distichal series are in close contact. The distichals, palmars, and lower 

 brachials have rather flattened sides. Two distichals without a syzygy, three palmars, 

 and sometimes three post-palmars, the axillary with a syzygy. 



Forty-six arms of subtriangular and somewhat overlapping joints, which become more 

 discoidal towards the middle of the arms and squarer towards the ends ; one hundred and 

 twenty joints in the anterior, and eighty in the posterior arms. 



Syzygies in the third, tenth, and fourteenth brachials, and afterwards at intervals of 

 three or four joints. 



The second joints after the distichal and subsequent axillaries bear long and rather 

 stout pinnules, the first one reaching nearly 25 mm. The pinnule of the third brachial 

 is smaller than that on the second, but the following ones are stouter, with rather large 

 joints. The terminal comb is small and much obscured by perisome. 



Mouth radial ; disk naked, with several non-tentaculiferous arms. 



Colour in spirit,— dark greyish-green. 



Disk 21 mm.; spread probably 22 cm. 



Locality.— Station 186, September 8, 1874 ; Prince of Wales Channel ; lat. 10° 30' N., 

 long. 142° 18' E.; 8 fathoms; coral mud. One specimen. 



Remarks. — This is a fine individual which is allied to Liitken's MS. species Actino- 

 metra trachygaster, and Actinometra intricata from Fiji, Tonga, and Samoa. I propose 

 to describe these at some future time, when it will be necessary to fix their characters 

 more precisely ; for I have seen specimens bearing these names which do not altogether 

 correspond with Liitken's types in the Copenhagen Museum. Actinometra valida is 

 much larger than Actinometra rotalaria, having an additional axillary, and also larger 

 and more numerous cirri ; while the rays are wide and generally in close lateral contact, 

 the sides of their lower joints being somewhat flattened, though much less so than in 

 Antedon. At first sight there appears to be no terminal comb on the lower pinnules. 

 This is due to its being obscured by the thickness of the perisome, but it becomes more 

 apparent in the dry state, though it is nothing like so well developed as in many smaller 

 individuals of other species. 



Actinometra, Series IV. 



Three distichals, the first two articulated, and the third axillary with a syzygy. 



Remarks. — More than half the described species of Actinorru tra belong to this 

 series, which, both in the abundance and in the variety of its specific forms, presents a 

 very strong contrast to the corresponding series in Antedon. The articulation of the 

 two outer radials, as compared with their syzygial union in the Typica-gvoxnp, which is 

 also tridistichate, is associated with the fact that the first two joints beyond the distichal 



