REPORT ON THE CRINOIDEA. 337 



each ray are also closely united laterally ; those of adjacent rays are sometimes united 

 all round the calyx, and sometimes separated by a strong interradial plating which 

 extends to about the level of the palmar axillaries. 



The rays may divide five times ; three distichals, the axillary with a syzygy ; palmars 

 two-jointed without a syzygy on the outside of the ray, but three-jointed with a syzygy 

 on the inside. First and second post-palmars three-jointed, the axillary with a syzygy. 



Eighty to one hundred arms ; the anterior ones long and slowly tapering, of one 

 hundred and fifty to two hundred slightly overlapping joints, which remain almost 

 triangular till near the end ; the posterior arms tapering rapidly, with eighty to one 

 hundred more quadrate joints. A syzygy in the third brachial ; the next from the tenth 

 to the seventeenth, with others at intervals of three to five joints. 



The distichal pinnule is moderately stout, reaching 30 mm. in length. Those on the 

 second joints of the following arm-divisions gradually decrease in size, but that of the 

 second brachial is only half as long as its predecessor, and the next two pairs of pinnules 

 are not much smaller. The terminal pinnules are much longer in the anterior than in 

 the posterior arms. The terminal comb of the lower pinnules is variable, being sometimes 

 small and ceasing about the tenth brachial, and sometimes much larger, extending out to 

 the fortieth joint. 



Mouth interradial ; the ventral surface of the disk is usually naked, except for a Uttle 

 plating round the peristome. The hinder arms are mostly without ambulacra, and in 

 one case, at least, there are ungrooved arms on each ray. 



Colour in spirit, — dull green, either alone or mottled with purple, brown, and white. 



Disk 50 mm.; spread 30 cm. 



Localities. — Station 208, January 17, 1875 ; Philippine Islands; lat. 11° 37' N.,long. 

 123° 31' E.; 18 fathoms; blue mud. One specimen. 



Samboangan ; 10 fathoms. Five specimens. 



Remarks. — This is a large and finely developed species, which differs from Actino- 

 metra duplex in the normal presence of a fifth post-radial axillary, and in the large 

 amount of perisomic plating between the rays and their subdivisions. It is further 

 distinguished by the characters of the centro-dorsal, which does not bear comparatively 

 stout cirri, as in Actinometra duplex (PI. LXIV. fig. 3), but almost reaches the condition 

 seen in Actinometra typica (PL EVIL fig. 1). The details of the process, which are 

 illustrated on PI. LXV. figs. 2-7, were explained on p. 15. 



The five specimens obtained at Samboangan are generally very similar in their 

 characters ; but that from Station 208 is more uniformly coloured and has a much larger 

 terminal comb, which extends to the fortieth brachial instead of ceasing about the tenth 

 as in the Samboangan form, to which I referred as Actinometra dissimilis on pp. 110, 

 111, of Part L; for I did not then consider them as specifically identical with the type 



(ZOOL. CHALL. EXP. PART LX. — 1888.) OoO 43 



