G08 FAORINA CHINENSIS. 



anterior petals are about a third longer than the posterior. The peripetalous 

 fasciole follows tolerably the general outline of the test ; in the anterior part 

 of the test it is double, forming across the anterior ambulacrum, between the 

 two anterior petals, an elongated, irregularly crescent-shaped area ; this fasci- 

 ole is broadest at the extremity of the petals. Troschel says there are three 

 genital openings ; in four of the specimens I have examined there were only 

 two, showing conclusively, what has already been insisted upon in other Spa- 

 tangoid genera, that the number of genital openings is not a structural fea- 

 ture of generic importance, as has been assumed. The anal system is at the 

 upper part of the vertically truncated extremity ; it is elliptical, but slightly 

 higher than broad, covered by one outer row of large polygonal plates, en- 

 closing a nearly circular area, covered by much smaller plates, in the centre 

 of which the anus is placed. The actinal surface is convex ; the actinostome 

 is situated near the anterior extremity ; it has a very projecting posterior lip 

 high above the anterior lip. The actinal plastron is elongate, triangular, con- 

 fluent with the posterior extremity, covered by a close tuberculatum, becom- 

 ing smaller and more crowded towards the posterior extremity. The posterior 

 ambulacra form broad, bare avenues near the actinostome. extending nearly 

 to the posterior n\>j;r. but becoming gradually concealed by the increasing 

 number of tubercles carried by the ambulacra! plates. The anterior ambu- 

 lacra are covered by large distant tubercles, like those of the interambulacral 

 area, diminishing in size and distance towards the ambitus. Along the 

 median line, in the two anterior ambulacra, the vertical sutures are left 

 bare a short distance from the mouth. A ver\ slender siihanal fasciole ex- 

 tends below the anal system from the ambitus to the level of the lower side 



of the anal system, reaching across the outer interambulacral line into the 

 vi]'j:q of the adjoining ambulacra! field. The bare median interambulacial 

 sutures are especially prominent in the abactinal part of the test ; the pos- 

 terior median interambulacral line extending along the edge of the test, from 

 the apical system to the anal system, is frequently as prominent as the bare 

 spaces, in continuation of the ambulacra] petals. The bare spaces become 

 indistinct towards the ambitus, with the exception of the posterior median 

 line, which is directly connected with the broad bare avenues of the actinal 

 surface. From the ambitus to the peripetalous fasciole the tubercles are 

 nearly uniform in size, crenulate, perforate, diminishing slightly in size to- 

 wards the fasciole. rather distant ; miliaries indistinct, not numerous ; the 

 horizontal sutures of the plates are frecpiently left bare. Above the fas- 



