r.REYXIA AUSTRALASIAE. 579 



bulacrum are minute, vertically distant ; the interporiferous space is bare, 

 Hanked by a row of larger miliaries, and a number of irregular smaller 

 miliaries. The anterior lateral petals are triangular ; the posterior zon< s 

 slightly curved towards the anterior extremity, they extend nearer the apical 

 system, and are separated only by a narrow space from the anterior zones of 

 the posterior lateral ambulacra ; these are more petaloid. the posterior zones 

 coming to a point on each side of the median posterior interambulacral 

 line. In the lateral interambulacra, within the peripetalous fasciole, there 

 are from eight to ten large tubercles, perforate, not crenulate, with a sunken 

 scrobicular area, carrying, as in Lovenia, huge spines curved towards the 

 posterior edge, equalling half the test in length. On each side of the odd 

 ambulacrum small secondary tubercles are crowded in irregular patches ; 

 similar patches are found along the median line of the posterior interambu- 

 lacrum. The Avhole of the abactinal surface is covered by small raised 

 tubercles of uniform size, carrying slender, silk-like curved spines ; they in- 

 crease gradually in size near the ambitus, where they are more crowded ; 

 and on the actinal side they become larger and quite distant in the whole 

 of the anterior part of the test, leaving only the short, bare ambulacral 

 avenues on the sides of the actinal plastron, covered by a few minute mil- 

 iaries. Round the actino3tome the tubercles are small, closely packed, imi- 

 tating bourrelets between the phyllodes. The spines of the actinal surface 

 correspond in size to the increase of the size of the tubercles. The subanal 

 plastron is heart-shaped ; the fasciole surrounding it broad ; the upper line 

 of the fasciole is not sharply defined, forming a broad band below the 

 anal system, and sending oft" indistinct anal branches. The posterior part 

 of the test immediately below the anal system is somewhat re-entering ; the 

 anal system is elliptical, longitudinal, pointed. In the specimens with spines 

 which I have seen in the British Museum Collection, the color of the test is 

 a dark chocolate ; the spines are of a light violet. The buccal and actinal 

 membranes were not preserved in the specimens examined. 



63.5 53. 31.3 25. 17. 14.4 26.5 



China ; Australia ; Japan. 



