35-1 THE VOYAGE OF H.M.S. CHALLENGER. 



lower cirri not specially shorter than the upper. Interarticular pores end between the 

 fifth and seventh nodes. 



Basals variable, sometimes flattened and almost ol^long, with wide upper angles and 

 no downward extensions ; sometimes very prominent and sharply pointed below. 

 Eadials usually four, with rather flattened surfaces, the second a sjzjgj. But there are 

 several variations from this type. The rays divide three, or rarely four, times, giving 

 about forty arms. These have about ninety joints beyond the last axillary, and are 

 moderately smooth at the base ; but their terminal portions become strongly serrate in 

 the medio-dorsal line. Primary arms of six to ten (usually six or eight) distichals, the 

 second or third of which is a syzygy. Secondary arms of ten to twenty-five (usually 

 twelve or fourteen) palmars, the third of which is generally a syzygy. On the outer side 

 of the ray there is sometimes, but rarely, another axillary after from fourteen to twenty- 

 six joints, of which the second or third is a syzygy. There is generally a syzygy in the 

 third brachial of the free arm ; another between the seventh and eleventh brachials, and 

 others at intervals of two to seventeen (usually four to eight) joints. 



Some of the radial pinnules are large, with massive and cuboidal lower joints ; but the 

 four following pinnules are smaller, and the basal joints, though broad and somewhat 

 flattened, are not as a rule specially massive, becoming comparatively inconspicuous 

 after the palmar axillary. Their dorsal edge is sharp but not strongly serrate. 



Disk well plated, both at the sides of and between the ambulacra. Brachial ambulacra 

 but little above the arm-groove, and supported by large plates which soon pass into dis- 

 tinct side and covering plates on the pinnules. 



Colour in spirit, greyish-white ; " of a uniform dusky purple when fresh " (Moseley). 



Locality. — Station 170a, July 14, 1874; near the Kermadec Islands; lat. 29° 45' 

 S., long. 178° 11' W. ; 630 fathoms ; volcanic mud; bottom temperature, 39°-5 F. One 

 specimen, but doubtful. 



Station 214, February 10, 1875; ofi" the Meangis Islands; lat. 4° 33' N., long. 

 127° 6' E.; 500 fathoms; blue mud; bottom temperature, 41"-8 F. Three (four?) 

 specimens. 



Remarks. — The individual figured on PI. XLIV., which is very well preserved, was 

 obtained at Station 214, off the Meangis Islands, together with two other examples which 

 have the arms broken off" at the syzygy in the second radials. A fourth mutilated 

 individual, which had lost the disk and two rays, reached me in a bottle which also con- 

 tained one specimen of Metacrinus unjvillii, and the label of Station 170a (near the 

 Kermadecs). On the other hand, the figured specimen of Metacrinus wyvilUi and also 

 that of Metacrinus varians were together in a jar with the label of Station 214 

 (Meangis Islands). There is no question from other evidence that Metacrinus ^vjJvillii, 

 like Pentacrinus naresianus, occurs at both Stations ; but I am a little uncertain al^out 

 the single specimen of Metacrinus varians. For the two species, although distinctly 



