EEPORT ON THE CRINOIDEA. 359 



four to ten (usually eight or nine) disticlials ; twelve to twenty-six, but usually not more 

 than sixteen, palmars in the secondary arms. Sometimes, but rarely, there is another ' 

 axillary after some thirteen to twenty joints more. The third joint after each axillary is 

 generally a syzygy. The following syzygies are distributed very irregularly in the free 

 arms. The second is between the ninth and thirtieth brachials, usually about the 

 twelfth or fifteenth ; and the others at intervals of three to twenty (generally ten or 

 twelve) joints. 



The second and following radials bear pinnules of about a dozen moderately stout 

 joints, the lowest of which are more or less massive and cuboidal, but vary considerably 

 in size according to circumstances. The first distichal pinnule is nearly similar to those 

 on the radials, but the following ones consist of more flattened joints, the lowest of which 

 are much broader than their successors. This inequality is very marked in the pinnules 

 which are borne on the palmars and the lower parts of the free arms, and also in a less 

 degree in the smaller terminal pinnules. Brachial ambulacra but little above the 

 narrow arm-groove, and only slightly plated between the origins of the pinnule- 

 ambulacra, which soon begin to show well defined side plates. 



Colour in spirit, gre5dsh-white ; a uniform dusky purple when fresh (Moseley). 



Localities. — 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. Two 

 specimens, one rather young. 



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

 127° 6' W.; 500 fathoms ; blue mud ; bottom temperature, 41°'8 F. One good specimen ; 

 one mutilated individual, and two stem-fragments, one of which has the calyx and a 

 portion of the arm-bases remaining. 



RemarTcs. — This species is the only Metacrinus which is known with certainty to 

 occur in the South as well as in the North Pacific. Although nearly resembling 

 Metacrinus moseleyi, Metacrinus costatus, and Metacrinus nodosus in the length of the 

 internodes of the stem and in the number of the distichal joints, it diff'ers from them all 

 in the other characters of the stem. The two last mentioned types have a somewhat 

 sharply pentagonal stem, and the cirrus-facets are not so high as the nodal joints, the 

 angles of which are much produced ; while the sides of the joints are smooth or slightly 

 tubercular (PI. XLIX. fig. 3 ; PL LI. fig. 8). Metacrinus ivyvillii, however, has a more 

 rounded stem with horizontal ridges on the internodal joints ; while the cirrus-facets 

 occupy the whole height of the nodal joints (PI. XL VII. figs. 1, 2). It is altogether a 

 larger species than Metacrinus moseleyi, and has entirely diff"erent stem-joints, as is 

 immediately evident upon comparison of the figures on Pis. XLV. and XLVII. respectively. 



Another good character of Metacrinus wyvillii, which is more or less visible, however, 

 in the species mentioned above, is the peculiar enlargement and flattening against the 

 arm of the basal joints of the pinnules immediately above the radials, and the persistence 



