57G LOVENIA ELONGATA. 



of a uniform size, with few distant miliaries. In the anterior interambulacra, 

 and the anterior half of the lateral posterior interambulacra, there are large 

 primary tubercles, perforate, not crenulate, with deeply sunken scrobicular 

 circles of various sizes, carrying powerful, long, curved spines, often equalling 

 two thirds of the test in length. 



On the actinal side the tubercles of the interambulacra] spaces increase 

 in size rapidly towards the bare ambulacra ; the scrobicular circles are deeply 

 sunken ; and the tip of the tubercle is bridged by a narrow space, curving 

 outward, connecting it with the anterior part of the test. 



The actinostome is crescent shaped, with rounded ends, twice as broad as 



long. The ph\ Modes are short ; pores distant, hut pr incut. The actinal 



surface is nearly flat ; the posterior lip of the actinostome forming a slight 

 keel. The hare spaces of the ambulacra are connected, so that the greater 

 part of the actinal surface is free from tubercles. The actinal plastron is 

 semicircular, limited to the posterior extremity of the actinal sin lace. The 

 posterior extremity slopes anteriorly from the upper edge ; the anal system 

 is situated at the bottom, on the upper side, of the deep inverted funnel, 

 which divides the subanal plastron into two almost disconnected portions. 

 The fasciole is convex posteriorly, behind the actinal plastron, forming two 



lateral loops, which spread over the edge, so as to cover the whole of the 

 inverted funnel of the posterior extremity below the anal system. The anal 

 system is longitudinally elliptical, pointed towards the lower edge; the 

 membrane is covered by an outer row of large plates, with smaller con- 

 centric rows of plates towards the anal opening, (hi the lateral shields of 

 the subanal plastron there are from eight to ten large primary tubercles, 

 carrying long, stout curved spines, forming two tufts on each side of the 

 sunken posterior extremity. The primary tubercles of the actinal side 

 carry long, slender spines, less curved than those of the abactinal side. The 

 actinal plastron is covered by minute secondaries, somewhat larger towards 

 the anterior edge, carrying short, stout, curved spines, while the spines of 

 the abactinal surface are short, slender, silk-like. The ambulacra on the 

 actinal side are covered by slender, short spines, mounted on miliaries, scat- 

 tered irregularly. The color in alcohol is a brilliant light violet ; the huge 

 spiines are lighter colored, handed with darker shades of violet On the 

 actinal side the coloring is lighter and of uniform tint. In small specimens 

 the coloration is uniform, and the large -pines are not prominently banded. 

 A tine series of species collected by McAndrew in the Eed Sea shows 



